AI Consensus Index

Best Stairlifts for Seniors With Arthritis (2026)

Bruno Elite SRE-2010 Stairlift leads the September 2026 consensus ranking for Arthritis-Friendly Controls & Seating, followed by Acorn 130 Stairlift and Harmar UP Stairlift.

Seven-platform comparisonA transparent comparison of which providers receive repeated recognition across seven AI platforms.
Built for careful comparisonSee the strengths, limitations, pricing considerations, and questions worth investigating before you decide.
Best Stairlifts for Seniors With Arthritis (2026) hero image
stairliftsPublished by Aging in Place Index to support informed aging-in-place decisions.

Answer Capsule

Bruno Elite SRE-2010 Stairlift leads the September 2026 consensus ranking for Arthritis-Friendly Controls & Seating, followed by Acorn 130 Stairlift and Harmar UP Stairlift. The current study includes 7 valid AI-platform responses and 7 qualifying entities. Compared with August 2026, the leader changed. The current list added Handicare 1100 and Savaria Handicare Freecurve Stairlift and removed Handicare 2000 Series. This is an immediately preceding-month comparison. Rank movement measures changes in this collection of standardized AI-platform responses. It is not product testing, customer-review evidence, or proof that a provider's underlying quality improved or declined.

What Changed Since August 2026

This comparison uses the immediately preceding completed month.

Bruno Elite SRE-2010 Stairlift remained No. 1 in September 2026. It was named by 7 platforms, compared with 6 in August 2026. Platform coverage changed from 6 valid responses in August 2026 to 7 in September 2026, so mention counts and shares are not directly comparable without that denominator change.

The current qualifying set added Handicare 1100 and Savaria Handicare Freecurve Stairlift. It no longer includes Handicare 2000 Series from the earlier top group. Entry or exit reflects the minimum-mention rule and the current response set, not a product launch, discontinuation, or quality finding.

Current rankEntityPrevious rankRank movementCurrent mentionsPrevious mentionsMention change
1Bruno Elite SRE-2010 Stairlift1No change76+1
2Acorn 130 Stairlift2No change65+1
3Harmar UP Stairlift3No change65+1
4Stannah Manufacturer Warranty Information4No change54+1
5AmeriGlide Cardinal Indoor Straight Stairlift5No change53+2
6Handicare 1100—New4——
7Savaria Handicare Freecurve Stairlift—New3——
—Handicare 2000 Series6Exited—2—

The table is calculated directly from the two stored ranking datasets. Positive rank movement means an entity moved closer to No. 1; mention change shows the difference in the number of included platform responses naming it.

The August 2026 edition preserves the complete earlier ranking and methodology for reference.

Research Snapshot

  • Topic: Best stairlifts for arthritis-friendly controls and seating
  • Target buyer: Seniors with arthritis in the hands, hips, knees, or back who need low-effort controls and comfortable seated transfers
  • Use case: Arthritis-Friendly Controls & Seating
  • Geography: United States
  • Research date: 2026-09-27
  • Platforms included: openai, anthropic, deepseek, grok, perplexity, kimi, google (7 platforms)
  • Number of unique entities named: 14
  • Number of qualifying entities: 7
  • Eligibility rule: Named by at least two platforms during ranking discovery
  • Ranking unit: Stairlift model and manufacturer
  • Evaluation criteria: Joystick/button ease of use, seat height, swivel seat operation, armrest comfort, footrest controls, ride smoothness, remote control availability, warranty terms

Platform mentions in this report count only ranking-discovery mentions. They do not represent the number of platforms that later completed a fit assessment. All seven platforms evaluated fit, but not every platform named every entity.

The Consensus Ranking

Questions This Section Answers

  • What are the best stairlifts for arthritis-friendly controls and seating in 2026?
  • Which stairlift models did all seven AI platforms agree on for seniors with arthritis?

The table below is the sole authority for rank, platform mentions, platform share, average listed position, and best listed position. It is reproduced exactly as calculated and is not recalculated here.

RankEntityPlatform mentionsAverage listed positionBest positionBest considered for
1Bruno Elite SRE-2010 Stairlift71.861Users with hip, knee, or back arthritis who need easier top-of-stair transfers; Users who benefit from adjustable seat height, armrest width, and footrest height; Users needing up to 400 lb capacity or a larger seat and footrest
2Acorn 130 Stairlift62.01Seniors with arthritis who can use a light-touch paddle or large remote buttons.; Users needing a straight-staircase lift with seated transfers at the upper landing.; Households prioritizing simple controls, battery backup, remote operation, and a lockable swivel seat.
3Harmar UP Stairlift64.332Users with hand arthritis who benefit from ergonomic armrest controls, joystick operation, or reduced need to bend and manually operate the footrest; Users with hip, knee, or back limitations who need a swivel seat and easier seated transfers at landings; Narrow straight staircases where the SL600's folded width and seat-height adjustability are valuable
4Stannah Manufacturer Warranty Information52.22Users with limited hand dexterity who need a low-force armrest control and easy-to-fasten belt.; Users needing easier transfers through longer armrests, adjustable seat height, powered footrest, or powered swivel seating.; Users with limited hip or knee flexibility who may benefit from the Sadler 260's semi-standing posture.
5AmeriGlide Cardinal Indoor Straight Stairlift57.05Seniors with mild-to-moderate hand arthritis who can operate a constant-pressure control.; Users who need remote calling controls and a swivel seat to reduce twisting during transfers.; Straight indoor staircases where compact folded dimensions and a relatively low advertised price are important.
6Handicare 110045.254Seniors using a straight indoor staircase who need a seated transfer rather than stair climbing; Users who can operate a hold-to-run joystick but have difficulty turning a seat or folding a footrest manually; Households wanting remote controls at both stair landings
7Savaria Handicare Freecurve Stairlift35.673Curved, turning, steep, narrow, or pie-shaped indoor staircases.; Users who benefit from joystick control rather than repeated small buttons or a hand-operated manual control.; Users who need powered seat rotation or a powered footrest to reduce bending and twisting.

Which Option Is Best for Which Version of the Buyer Need?

Questions This Section Answers

  • Which stairlift should a senior with hand arthritis choose if they cannot grip a constant-pressure control?
  • Which stairlift is best for a curved staircase when the buyer also has hip or knee arthritis?
  • Which stairlift has the lowest advertised price for arthritis-friendly controls and seating?
Buyer NeedBest-Fit EntityWhy It FitsKey Tradeoff
Severe hand arthritis, needs lowest control forceAcorn 130 StairliftLarge paddle controls requiring light touch; Arthritis Foundation Ease-of-Use Commendation across all models [e2:anthropic:C2]Manual swivel lever standard; powered swivel is an upgrade
Hip, knee, or back arthritis with difficult sit-to-standStannah Manufacturer Warranty Information (Sadler 260 configuration)Semi-standing perch design with assisted seat and arm-to-footrest linking [e4:openai:c_sadler]Perch posture is unsuitable for buyers who need a fully seated ride
Curved or multi-landing staircase with arthritisHarmar UP StairliftAutomatic 60-degree power swivel and automatic folding footrest described as standard [e3:google:up_stairlift_101mobility]275 lb capacity limit; constant-pressure controls
Highest weight capacity with adjustable seatingBruno Elite SRE-2010 Stairlift400 lb capacity, adjustable seat height, adjustable armrest width, larger seat and footrest options [e1:openai:c4]Power swivel and power footrest are paid options
Lowest advertised upfront priceAmeriGlide Cardinal Indoor Straight Stairlift$1,999 advertised base price with two remote controls standard [e5:openai:c5]Constant-pressure toggle control; manual swivel and manual footrest standard
Smoothest ride on a straight staircaseHandicare 1100Friction-drive system described as quiet and gradual [e6:google:1.1.1]Powered swivel and powered footrest are upgrades
Curved staircase needing powered transfer aidsSavaria Handicare Freecurve StairliftPowered swivel up to 80 degrees, powered footrest, optional Active Seat [e7:openai:freecurve_brochure]275 lb capacity; dealer-quoted pricing only
Watch Watch the video on YouTube on YouTube

1. Bruno Elite SRE-2010 Stairlift

Questions This Section Answers

  • Is the Bruno Elite SRE-2010 worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Is the Bruno Elite SRE-2010 or the Acorn 130 better for a senior with hand arthritis who cannot hold a control continuously?

Verdict. The Bruno Elite SRE-2010 is the consensus leader for this use case, named by all seven platforms. It combines single-button armrest operation, two wireless remotes, adjustable seat height, adjustable armrest width, an easy-turn seat, and optional power swivel and power footrest functions [e1:openai:c1]. It is not automatically the best fit when hand strength is severely limited, because the standard controls use constant pressure and the power options increase cost.

Why it ranked here. Bruno received the most platform mentions (7 of 7) and the best average listed position (1.86). Platforms ranked it first on openai, deepseek, perplexity, and google, and third on anthropic, grok, and kimi. The breadth of agreement reflects a consistent feature set across sources: 400 lb capacity, adjustable seating, and optional powered transfer aids.

Best suited for. Users with hip, knee, or back arthritis who need easier top-of-stair transfers; users who benefit from adjustable seat height, armrest width, and footrest height; users needing up to 400 lb capacity or a larger seat and footrest [e1:openai:c4].

Main strengths for the use case. Single-button armrest operation and included wireless remotes; power swivel option for easier seated transfers; power footrest option that reduces bending or reaching; adjustable seat height, armrest width, and footrest height; larger seat and footrest options; 400 lb capacity [e1:openai:c4]. Anthropic reported seat height adjustable from approximately 17.75 inches to 21.625 inches and a soft-start feature that prevents abrupt movement [e1:anthropic:c3].

Main limitations. Standard controls use constant pressure, which may be difficult for some users with severe hand arthritis [e1:anthropic:c6]. Power swivel and power footrest appear to be configuration options and can materially increase price. The straight SRE-2010 is not appropriate for curved or multi-flight staircases without selecting a different custom model. Exact seat comfort, control force, seat height range, and transfer ease require an in-home assessment or demonstration. Public warranty information is inconsistent across current marketing and older SRE-2010 manuals. No independent clinical or comparative evidence was found showing superior arthritis outcomes.

Pricing or cost summary. No official public price was found. Independent U.S. dealer listings indicate roughly $4,000–$6,000 installed for an Elite straight indoor stairlift, with some listings around $5,495 before certain upgrades [e1:openai:c8][e1:openai:c9]. Google-reported pricing placed the range between approximately $3,100 and $5,500 including standard installation [e1:google:1.2.2]. Optional power swivel, larger seat, power folding rail, and power folding footrest may add separate charges. Pricing confidence is low.

Where platforms disagreed. Fit ratings ranged from "strong" (google) to "uncertain" (deepseek). Deepseek reported that its search results contained no specific, verifiable details about the SRE-2010 and returned unrelated lift-chair and wheelchair content [e1:deepseek:C1]. Google described the armrest control as a low-effort rocker ideal for limited hand dexterity [e1:google:1.1.5], while anthropic and grok described the same control as a constant-pressure rocker requiring sustained grip [e1:anthropic:c6][e1:grok:0]. Warranty descriptions also conflicted: current marketing references an industry-leading or limited-lifetime warranty, while older SRE-2010 documents describe five-year major-component and two-year parts coverage [e1:openai:c7][e1:perplexity:c7].

For the complete fit review, see Bruno Elite SRE-2010 Stairlift.

What Changed Since August 2026

Bruno Elite SRE-2010 Stairlift remained at No. 1, and platform mentions increased from 6 to 7. The September 2026 article reframes the Bruno Elite SRE-2010 around the straight model itself, while the August 2026 write-up led with the broader Bruno line and the Elan. The earlier piece recommended selecting the optional power swivel seat and power folding footrest; that configuration guidance is not repeated. The current article reports roughly $4,000–$6,000 installed from dealer listings, with some listings around $5,495 before upgrades. The earlier range of $2,900–$6,000 is no longer repeated. The current write-up also states the control is a constant-pressure rocker, which may be difficult for users with severe hand arthritis. Differences between the two editions reflect what each article reports; they do not by themselves prove that the product, service, or price changed.

2. Acorn 130 Stairlift

Questions This Section Answers

  • Is the Acorn 130 Stairlift worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Which stairlift should a buyer choose if they need independent Arthritis Foundation validation of low-effort controls?

Verdict. The Acorn 130 is a strong fit for arthritis-friendly controls and seated transfers on a straight staircase. It offers large armrest paddle controls, remote controls, a swivel seat, smooth-start and smooth-stop operation, a published seat height of approximately 17.25 inches, and an Arthritis Foundation Ease of Use listing [e2:openai:c1][e2:openai:c2]. The fit weakens for users who cannot comfortably operate a manual swivel mechanism or who need highly adjustable seating.

Why it ranked here. Acorn received 6 of 7 platform mentions and the second-best average listed position (2.00). It was ranked first by anthropic, grok, and kimi, second by google, third by deepseek, and fourth by openai. The Arthritis Foundation commendation was the single most frequently cited differentiator.

Best suited for. Seniors with arthritis who can use a light-touch paddle or large remote buttons; users needing a straight-staircase lift with seated transfers at the upper landing; households prioritizing simple controls, battery backup, remote operation, and a lockable swivel seat [e2:openai:c1].

Main strengths for the use case. Large, light-touch armrest paddle controls are potentially easier for arthritic hands than small controls. Remote control availability can reduce reaching and repeated hand use. Swivel-seat design supports seated transfers at the top of the stairs. Published 17.25-inch seat height may be workable for some users with hip or knee limitations. Smooth-start and smooth-stop operation is relevant to users sensitive to jarring movement. Powered footrest and powered swivel-seat options should be considered where bending, hand strength, or twisting is limited. The Arthritis Foundation lists Acorn stairlifts as an Ease of Use product evaluated by people with arthritis and independent experts [e2:openai:c2].

Main limitations. The standard swivel-seat mechanism may require manual operation; powered swivel-seat inclusion and pricing are not clear [e2:openai:c6]. Seat height, seat depth, armrest dimensions, padding, and transfer clearance may not be sufficiently customizable for every user. The 130 is limited to straight staircases. Published capacity is 280 pounds on the current U.S. product page, while an independent 2026 review refers to 300 pounds [e2:openai:c5]. Ride smoothness and comfort claims are primarily manufacturer-reported rather than independently compared. The first-year warranty does not establish the cost of repairs, batteries, service calls, or extended coverage after expiration.

Pricing or cost summary. A current U.S. purchase price for the Acorn 130 is not publicly posted on the reviewed official product page; Acorn directs buyers to a free home survey and quotation. Anthropic reported installed costs typically ranging $3,000–$5,000 for straight staircases, with powered swivel seat upgrades estimated at $500–$1,500 and powered footrest options at $300–$800, though these are not publicly listed by Acorn [e2:anthropic:C8]. Grok reported a similar $3,000–$5,000 installed range [e2:grok:web:4]. Pricing confidence is low to moderate.

Where platforms disagreed. Fit ratings split between "strong" (anthropic, grok) and "mixed" (deepseek, perplexity, kimi). Perplexity reported that the checked public materials do not confirm a powered swivel seat on the Acorn 130 [e2:perplexity:C1], while anthropic and google both described a powered swivel upgrade as available [e2:anthropic:C3][e2:google:1.3.2]. Kimi reported no publicly documented seat height adjustability [e2:kimi:c1], while anthropic reported three seat post heights: short (16.25 inches), standard (17.5 inches), and tall (19.75 inches) [e2:anthropic:C4]. Weight capacity also conflicted between 280 and 300 pounds.

For the complete fit review, see Acorn 130 Stairlift.

What Changed Since August 2026

Acorn 130 Stairlift remained at No. 2, and platform mentions increased from 5 to 6. The September 2026 article reframes the Acorn 130 Stairlift around a narrower buyer fit than the August write-up, which called it a good but not definitive choice. The current verdict weakens for users who cannot operate a manual swivel mechanism or need highly adjustable seating, and the limitations now question seat height, depth, padding, and transfer clearance customization. On pricing, the current article newly reports powered swivel seat upgrades estimated at $500–$1,500 and powered footrest options at $300–$800; the earlier straight-system figure of $2,500–$4,000 is no longer repeated. The prior same-day installation estimate and 12-month warranty terms also are not repeated. Differences between the two editions reflect what each article reports; they do not by themselves prove that the product, service, or price changed.

3. Harmar UP Stairlift

Questions This Section Answers

  • Is the Harmar UP Stairlift worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Which stairlift should a buyer with a curved staircase choose if they need automatic power swivel and automatic folding footrest as standard features?

Verdict. Harmar is a good fit for arthritis-friendly controls and seated transfers when the buyer selects the powered options and has a suitable straight or curved staircase. The SL600 offers ergonomic controls, a swivel seat, padded armrests, adjustable seat height, remote call/send capability, and an optional power footrest. The UP offers a power swivel seat, automatic folding footrest, joystick remote, and constant-pressure controls [e3:openai:c1][e3:openai:c2].

Why it ranked here. Harmar received 6 of 7 platform mentions but a weaker average listed position (4.33). It was ranked second by openai, fourth by grok and perplexity, fifth by anthropic and kimi, and sixth by google. The split reflects the fact that Harmar's arthritis-friendly features are strongest on the UP curved model and on SL600 configurations with paid power options.

Best suited for. Users with hand arthritis who benefit from ergonomic armrest controls, joystick operation, or reduced need to bend and manually operate the footrest; users with hip, knee, or back limitations who need a swivel seat and easier seated transfers at landings; narrow straight staircases where the SL600's folded width and seat-height adjustability are valuable; curved or multi-landing stairs requiring faster modular installation and automatic transfer features [e3:openai:c1].

Main strengths for the use case. Strong feature alignment for reduced bending and easier transfers when the buyer specifies the powered swivel and power footrest on the SL600. The UP provides automatic seat swivel and automatic folding footrest as standard product features according to Harmar [e3:google:up_stairlift_101mobility]. The SL600 provides adjustable seat height from 17 to 22 inches, padded armrests, ergonomic armrest control, remote call/send, and a 350 lb capacity [e3:openai:c1]. Harmar states that dealers are available in all 50 states.

Main limitations. The UP's 275 lb capacity may exclude some users. The UP's constant-pressure controls may be difficult for users with severe grip weakness or painful hand joints. The SL600 power footrest and swivel seat are options, not necessarily included in the base price. Published materials do not provide joystick force, button force, control dimensions, seat-cushion pressure data, or independent arthritis-specific usability testing. The UP is a modular curved system rather than a fully custom welded rail. Warranty details for the UP were not found in the reviewed public sources.

Pricing or cost summary. Exact Harmar UP, SL600, installation, and powered-option prices are not publicly listed in the reviewed official product pages; Harmar directs buyers to dealers. Harmar's access-any-floor page gives approximately $9,000 as an average installed cost for a curved stairlift, but this is not a quote for the UP [e3:openai:c7]. Grok reported straight models typically $2,000–$5,000 installed and curved around $12,000+ [e3:grok:3]. Perplexity reported straight Harmar lifts around $2,995–$5,995 and curved lifts starting around $10,995–$11,700+ [e3:perplexity:c5]. Pricing confidence is low.

Where platforms disagreed. Fit ratings ranged from "strong" (google, grok) to "mixed" (kimi). Google described the UP as having automatic power swivel and automatic folding footrest as standard [e3:google:up_stairlift_101mobility], while openai noted that a Harmar FAQ discusses powered footrests and power seat swivels as options depending on model, and that the exact UP configuration should be confirmed in the dealer quote [e3:openai:c2]. Kimi reported that its search results contained no specific Harmar stairlift control details and returned generic lift-chair content [e3:kimi:c1]. Warranty terms also conflicted: grok reported SL600 lifetime motor coverage and UP 2-year parts/5-year motor [e3:grok:13], while openai reported SL600 lifetime coverage for motor, gearbox, rail, worm gear, and gear rack with three years for other parts [e3:openai:c6].

For the complete fit review, see Harmar UP Stairlift.

What Changed Since August 2026

Harmar UP Stairlift remained at No. 3, and platform mentions increased from 5 to 6. The September 2026 article shifts the Harmar UP Stairlift's buyer fit toward arthritis-friendly controls and seated transfers, with the UP presented as a modular curved system offering a standard power swivel seat and automatic folding footrest. The write-up now separates the SL600's 350 lb capacity from the UP's 275 lb limit, warning that constant-pressure controls may challenge severe grip weakness. Pricing evidence was refreshed: the current article newly reports approximately $9,000 as an average installed curved-stairlift cost and $2,000–$5,000 for straight models, while the earlier $1,550 figure for combined powered options is no longer repeated. Differences between the two editions reflect what each article reports; they do not by themselves prove that the product, service, or price changed.

4. Stannah Manufacturer Warranty Information

Questions This Section Answers

  • Is Stannah worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Which stairlift should a buyer choose if they need a lifetime carriage motor gearbox warranty and a one-hand seatbelt?

Verdict. Stannah is a good fit for arthritis-friendly controls and seated transfers when the buyer selects a model with an ergonomic hand control, powered footrest, powered swivel seat, and suitable seat height. The Siena is the strongest general seated option; the Sadler 260 may better suit buyers with hip, knee, or back-flexibility limitations, but it is a perch-style design rather than a conventional seated stairlift [e4:openai:c_sadler]. Warranty value is potentially strong, but U.S. warranty terms are presented inconsistently across Stannah pages and must be confirmed in the purchase documents.

Why it ranked here. Stannah received 5 of 7 platform mentions but the second-best average listed position (2.20). It was ranked second by anthropic, grok, kimi, and perplexity, and third by google. The entity as ranked is the manufacturer warranty information, which means the ranking reflects warranty strength as much as control ergonomics.

Best suited for. Users with limited hand dexterity who need a low-force armrest control and easy-to-fasten belt; users needing easier transfers through longer armrests, adjustable seat height, powered footrest, or powered swivel seating; users with limited hip or knee flexibility who may benefit from the Sadler 260's semi-standing posture; buyers who value manufacturer-installed equipment and ongoing call-out support in the United States [e4:openai:c_siena][e4:openai:c_sadler].

Main strengths for the use case. Low-effort ergonomic hand controls and remote-control availability are directly relevant to hand arthritis. The Siena offers longer armrests, a wider seat, adjustable seat height on straight stairs, retractable one-hand belt operation, and powered footrest availability [e4:openai:c_siena]. Powered swivel seating can reduce the physical effort of turning for transfers. The Sadler 260 offers a potentially useful alternative for limited hip, knee, or back flexibility and difficult sit-to-stand transfers. Manufacturer warranty and call-out support may reduce ownership friction, subject to direct-versus-distributor terms.

Main limitations. Stannah's public U.S. information does not establish independent evidence of superior ride smoothness, seat cushioning, or arthritis outcomes. The Sadler's near-standing posture may be unsuitable for users who need a conventional fully seated chair or have poor standing tolerance. Powered swivel seating may be optional rather than standard and may increase price. Published U.S. warranty pages conflict on parts, labor, and gearbox durations. No public U.S. price or service-plan price was found. A home assessment and demonstration are important because seat height, armrest position, belt reach, stair geometry, and transfer direction affect usability.

Pricing or cost summary. No fixed U.S. purchase price was published in the reviewed sources. Stannah uses a free home assessment and individualized quote. New U.S. stairlifts: Stannah's registration page states lifetime carriage motor gearbox coverage plus one year of parts and labor coverage [e4:openai:c_warranty_register]. Parts coverage may be extendable up to five years through a comprehensive service plan or annual preventive maintenance. Post-warranty service-plan pricing was not published in the reviewed U.S. sources. Pricing confidence is low.

Where platforms disagreed. Fit ratings ranged from "strong" (anthropic) to "uncertain" (kimi). Kimi reported that no verifiable information about Stannah's specific warranty terms, product features, or control designs was found in its available search results [e4:kimi:search_2026]. Google reported that standard parts including electronic joysticks, controls, and powered swivels are only covered under a 1-year standard warranty, with labor covered for only one year [e4:google:1.1.3], while grok reported a 2-year comprehensive warranty with free services and lifetime carriage motor gearbox coverage [e4:grok:1]. Perplexity reported that U.S. pages conflict between one-year and two-year parts/labor descriptions [e4:perplexity:c11][e4:perplexity:c12].

For the complete fit review, see Stannah Manufacturer Warranty Information.

What Changed Since August 2026

Stannah Manufacturer Warranty Information remained at No. 4, and platform mentions increased from 4 to 5. The September 2026 article reframes this entry as Stannah Manufacturer Warranty Information rather than the broader Stannah brand, shifting the buyer focus toward warranty strength alongside control ergonomics. The named models are now the Siena and Sadler 260, with the Sadler described as a perch-style rather than conventional seated chair. The prior write-up's specific dollar figures, including the $900 powered swivel upgrade and the $4,700 and $10,800 starting prices, are no longer repeated; the current article reports no fixed U.S. purchase price and directs buyers to an individualized quote after a free home assessment. Warranty terms are now described as conflicting across Stannah's own U.S. pages, so buyers should confirm coverage in purchase documents. Differences between the two editions reflect what each article reports; they do not by themselves prove that the product, service, or price changed.

5. AmeriGlide Cardinal Indoor Straight Stairlift

Questions This Section Answers

  • Is the AmeriGlide Cardinal Indoor Straight Stairlift worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Which stairlift for arthritis-friendly controls and seating has the lowest published base price, and what fees apply?

Verdict. The Cardinal Indoor is a good fit for many seniors with arthritis because it combines constant-pressure ergonomic controls, left- or right-handed control positioning, standard remote controls, a manual swivel seat with an optional powered upgrade, padded seating, and soft start/stop operation [e5:openai:c1][e5:openai:c2]. It is not the strongest fit when hand weakness makes manual controls or manual swiveling difficult, or when the buyer needs a verified seat-height adjustment, highly supportive back seating, or a fully specified powered footrest.

Why it ranked here. AmeriGlide received 5 of 7 platform mentions but the weakest average listed position (7.00) among qualifying entities. It was ranked fifth by openai and grok, seventh by deepseek, eighth by kimi, and tenth by anthropic. The low average reflects that platforms recognized its price advantage but flagged its constant-pressure control and manual standard features as limitations for this specific use case.

Best suited for. Seniors with mild-to-moderate hand arthritis who can operate a constant-pressure control; users who need remote calling controls and a swivel seat to reduce twisting during transfers; straight indoor staircases where compact folded dimensions and a relatively low advertised price are important [e5:openai:c1].

Main strengths for the use case. Standard remote controls reduce the need to reach or operate the lift from the opposite landing. Constant-pressure ergonomic controls and reversible control positioning may accommodate some hand-dexterity limitations. Manual swivel seating is standard, with a powered swivel option for users who cannot comfortably turn the seat by hand. Padded seat and backrest, removable covers, and soft start/stop are relevant to seated comfort and transfer confidence. Compact folded dimensions may preserve stair access for other household members.

Main limitations. The standard swivel seat requires manual operation; the powered upgrade is not priced or fully specified publicly. No verified seat-height measurement or adjustment range is provided. No published operating-force specification, detailed hand-control design, or independent arthritis-user testing was found. Armrest dimensions, lumbar support, footrest adjustment, and powered-footrest availability are unclear. The product is limited to straight indoor staircases and requires separate installation planning. The 275-pound capacity may exclude some users [e5:openai:c1].

Pricing or cost summary. AmeriGlide publicly lists the Cardinal Indoor at $1,999, with shipping shown separately [e5:openai:c5]. Anthropic reported shipping at $225, colored seat upgrades at $144 each, additional remotes at $182 each, and adjustable feet at $64 each [e5:anthropic:C3]. Straight-stair installation is advertised from as low as $199, but it is not included in the product page's basic-installation specification. Google reported professional installation fees typically $500–$600 since self-installation is not permitted on this model [e5:google:1.2.1]. Pricing confidence is moderate.

Where platforms disagreed. Fit ratings ranged from "good" (openai, grok, perplexity) to "uncertain" (kimi). Kimi reported that no verifiable product-specific information, independent reviews, or confirmed specifications for this exact model were retrieved during research [e5:kimi:search_failure_1]. Google described the control as a constant-pressure rocker that must be held down continuously, which may cause fatigue for seniors with severe hand arthritis [e5:google:1.1.9], while openai described the same controls as ergonomic with left- or right-handed options [e5:openai:c2]. Warranty terms also varied: openai reported a two-year warranty [e5:openai:c1], while google reported a two-year parts warranty plus a five-year drive train warranty [e5:google:4.2.2].

For the complete fit review, see AmeriGlide Cardinal Indoor Straight Stairlift.

What Changed Since August 2026

AmeriGlide Cardinal Indoor Straight Stairlift remained at No. 5, and platform mentions increased from 3 to 5. The September 2026 article reframes the AmeriGlide Cardinal Indoor Straight Stairlift around constant-pressure ergonomic controls with left- or right-handed positioning, plus a manual swivel seat that can be upgraded to powered, where the August 2026 write-up emphasized a joystick or directional control and treated the powered swivel as the leading reason to buy. Buyer fit now centers on mild-to-moderate hand arthritis rather than severe hand or wrist involvement. The current section newly reports $225 and $144, while the earlier $2,095 figure is no longer repeated. The prior write-up also cited a two-year warranty and a 30-day battery term that the current section does not repeat. Differences between the two editions reflect what each article reports; they do not by themselves prove that the product, service, or price changed.

6. Handicare 1100

Questions This Section Answers

  • Is the Handicare 1100 worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Which stairlift should a buyer choose for a straight staircase if they want a friction-drive ride and a hold-to-run joystick?

Verdict. The Handicare 1100 is a good fit for arthritis-related hand, hip, knee, or back limitations when equipped with its powered swivel seat and powered footrest. Its joystick, remote controls, and optional powered functions can reduce manual effort, but the standard configuration requires manual seat swiveling and manual footrest operation [e6:openai:c1]. Seat height, armrest comfort, ride smoothness, installation pricing, and dealer-specific service terms require confirmation before purchase.

Why it ranked here. Handicare received 4 of 7 platform mentions and an average listed position of 5.25. It was ranked fourth by google, fifth by deepseek, and sixth by anthropic and kimi. The narrower mention base reflects that several platforms did not name the 1100 during ranking discovery.

Best suited for. Seniors using a straight indoor staircase who need a seated transfer rather than stair climbing; users who can operate a hold-to-run joystick but have difficulty turning a seat or folding a footrest manually; households wanting remote controls at both stair landings; buyers willing to specify paid powered-seat and powered-footrest upgrades [e6:openai:c1].

Main strengths for the use case. Joystick control may be easier than more dexterity-intensive controls for some users. Powered swivel and powered footrest options directly address difficult seated transfers and leg movement. Two remote controls can be positioned at the stair landings. Indoor straight-stair configuration is relatively focused and avoids the complexity of a curved custom rail. Anthropic reported seat height adjustable in four positions from approximately 17 to 20.5 inches and a manual swivel operated by pushing down a lever rather than pulling up [e6:anthropic:cite_1][e6:anthropic:cite_5].

Main limitations. The arthritis-friendly features are optional rather than clearly standard. Manual seat swivel and manual footrest operation remain relevant limitations in the base configuration. A hold-to-run joystick may still be difficult for users with severe hand weakness, pain, tremor, or limited endurance. Seat height, cushion support, armrest ergonomics, and transfer ease are not sufficiently verified from public sources. Warranty excludes labor and several wear-related or misuse-related costs. The product is not intended for curved staircases.

Pricing or cost summary. No verified U.S. list price was found for the Handicare 1100. Perplexity reported a dealer comparison citing about $3,190 unit-only and about $345–$445 for straight installation [e6:perplexity:c12]. Google reported base model pricing around $3,299–$3,999 with motor-powered swivel seat and motor-powered footrest upgrades at approximately $650 each, or a combined powered upgrade kit at approximately $1,295 [e6:google:1.2.6]. Grok reported a $2,500–$4,500 installed range from dealer examples [e6:grok:16]. Pricing confidence is low to moderate.

Where platforms disagreed. Fit ratings ranged from "good" (anthropic, google, grok, openai, perplexity) to "mixed" (deepseek, kimi). Deepseek reported that the official site retrieval failed and that key specifications such as seat height, swivel force, control type, and warranty could not be verified [e6:deepseek:handicare_1100_page]. Warranty terms conflicted across sources: one U.S. dealer page reported 24 months parts [e6:perplexity:c1], another reported 24 months parts plus limited lifetime on powertrain [e6:perplexity:c14], and another reported 2 years on the 1100 with 10 years on motor and gearbox [e6:perplexity:c13]. Google reported a lifetime warranty on the motor and gearbox with a 24-month parts warranty [e6:google:1.2.6].

For the complete fit review, see Handicare 1100.

7. Savaria Handicare Freecurve Stairlift

Questions This Section Answers

  • Is the Savaria Handicare Freecurve Stairlift worth it for arthritis-friendly controls and seating, and what are its main drawbacks?
  • Which stairlift should a buyer with a curved staircase choose if they need powered seat rotation or a powered footrest?

Verdict. The Handicare Freecurve is a good fit for many buyers with hand, hip, knee, or back arthritis because it offers an easy-to-push joystick, powered swivel and footrest options, remote controls, several seat choices, and a custom rail for curved stairs [e7:openai:freecurve_brochure]. Fit is weaker when the buyer needs a low seat, more than 275 lb capacity, confirmed exceptionally smooth operation, or a low and predictable installed price.

Why it ranked here. Savaria Handicare Freecurve received 3 of 7 platform mentions and an average listed position of 5.67. It was ranked third by perplexity, sixth by deepseek, and eighth by anthropic. The narrow mention base reflects that only three platforms named it during ranking discovery, but its best position of 3 indicates that at least one platform considered it a top-tier option for curved-stair buyers.

Best suited for. Curved, turning, steep, narrow, or pie-shaped indoor staircases; users who benefit from joystick control rather than repeated small buttons or a hand-operated manual control; users who need powered seat rotation or a powered footrest to reduce bending and twisting; buyers who need remote call/send controls at the top and bottom of the stairs [e7:openai:freecurve_brochure].

Main strengths for the use case. Easy-to-push armrest joystick is directly relevant to hand arthritis. Powered swivel and optional Active Seat can reduce twisting, pivoting, and effort during seated transfers. Powered footrest option can reduce bending for users with hip, knee, or back limitations. Two remote controls support low-effort calling and sending from either landing. Multiple seat styles and adjustable armrest availability may improve fit and comfort. Custom curved rail is appropriate for complex stair layouts.

Main limitations. Powered swivel, powered footrest, Active Seat, and other transfer aids may cost extra and are not all standard. The published 275 lb capacity may exclude some users. Seat dimensions and transfer height vary by seat and installation; published dimensions do not establish suitability for a specific user's hip or knee range of motion. Manual swivel operation remains available, but may be difficult for users with significant hand weakness unless powered swivel is purchased. No verified independent evidence was found for arthritis-specific outcomes, required joystick force, or objectively measured ride smoothness. Manufacturer warranty parts coverage does not automatically include labor, dealer service, batteries, or all wear items.

Pricing or cost summary. Savaria does not publish a fixed U.S. retail price for the Freecurve and directs buyers to an authorized dealer for a home assessment and quote. A 2026 third-party dealer-price compilation reports approximately $9,999 for a base Freecurve configuration before custom rail, installation, and options; this is not an official quote [e7:openai:third_party_price_compilation]. Google reported custom curved monorail stairlifts typically ranging from $10,000 to $25,000 or more depending on rail length and options [e7:google:1.1.6]. Pricing confidence is low.

Where platforms disagreed. Fit ratings ranged from "strong" (google, grok) to "uncertain" (kimi). Kimi reported that critical arthritis-specific control and seating specifications were not publicly verifiable and that its retrieved evidence focused primarily on lift chairs rather than stairlifts [e7:kimi:unverified]. Perplexity reported that the checked sources do not clearly describe a joystick and that exact control ergonomics for arthritic hands remain unclear [e7:perplexity:c1], while openai and anthropic both described an easy-to-push armrest joystick [e7:openai:freecurve_brochure][e7:anthropic:c1]. Warranty terms also conflicted: the product brochure describes limited lifetime rail and powertrain coverage, while the detailed warranty specifies indoor motor and gearbox coverage as 10 years [e7:openai:savaria_warranty][e7:perplexity:c9].

For the complete fit review, see Savaria Handicare Freecurve Stairlift.

What the Cross-Platform Study Reveals About This Market

Questions This Section Answers

  • What do AI platforms consistently say about arthritis-friendly stairlift features in 2026?
  • Which arthritis-friendly stairlift features are most often described as optional rather than standard?

Three patterns emerge from the seven-platform study.

First, powered transfer aids are almost always optional. Across Bruno, Acorn, Harmar SL600, Handicare 1100, and Savaria Freecurve, powered swivel seats and powered footrests are described as upgrades or configuration options rather than standard equipment [e1:openai:c1][e2:openai:c6][e3:openai:c1][e6:openai:c1][e7:openai:freecurve_brochure]. The Harmar UP is the notable exception, with automatic power swivel and automatic folding footrest described as standard on that model [e3:google:up_stairlift_101mobility].

Second, control force is the least documented and most contested specification. Platforms disagreed about whether the Bruno Elite's armrest control is a low-effort rocker or a constant-pressure switch requiring sustained grip [e1:google:1.1.5][e1:anthropic:c6]. Similar uncertainty appears for the AmeriGlide Cardinal [e5:openai:c2][e5:google:1.1.9] and the Handicare 1100 [e6:anthropic:cite_1][e6:deepseek:handicare_1100_page]. Only Acorn produced an independent third-party validation of control ease through the Arthritis Foundation Ease-of-Use Commendation [e2:anthropic:C2].

Third, pricing transparency is poor across the category. Bruno, Acorn, Stannah, Harmar, Handicare, and Savaria all direct buyers to dealer quotes or in-home assessments rather than publishing fixed installed prices [e1:openai:c8][e2:openai:c7][e4:openai:c_prices][e3:openai:c7][e6:openai:c5][e7:openai:savaria_faq]. Only AmeriGlide publishes a specific advertised base price of $1,999 [e5:openai:c5].

Where the AI Platforms Agreed

Questions This Section Answers

  • Which stairlift features did all seven AI platforms agree are important for arthritis-friendly controls and seating?

Platforms converged on several points:

  • Remote controls matter. Every qualifying entity was described as including or offering remote call/send controls [e1:openai:c1][e2:openai:c3][e3:openai:c1][e4:openai:c_stairlifts][e5:openai:c1][e6:openai:c2][e7:openai:freecurve_brochure].
  • Swivel seating supports transfers. Every qualifying entity was described as offering a swivel seat, whether manual or powered [e1:openai:c1][e2:openai:c6][e3:openai:c1][e4:openai:c_siena][e5:openai:c1][e6:openai:c1][e7:openai:freecurve_brochure].
  • Powered options reduce effort. Platforms consistently described powered swivel and powered footrest as the features most relevant to arthritis-related limitations, even when those features are optional.
  • Straight versus curved is a hard constraint. Bruno, Acorn, Harmar SL600, AmeriGlide Cardinal, and Handicare 1100 are straight-stair products; Harmar UP and Savaria Freecurve address curved stairs [e1:openai:c1][e2:openai:c1][e3:openai:c1][e5:openai:c1][e6:openai:c1][e3:openai:c2][e7:openai:freecurve_brochure].
  • Warranty terms are inconsistent across public sources. Bruno, Acorn, Stannah, Harmar, Handicare, and Savaria all showed conflicting warranty descriptions across reviewed pages [e1:openai:c7][e2:openai:c7][e4:openai:c_warranty_register][e3:openai:c6][e6:perplexity:c1][e7:openai:savaria_warranty].

Where the AI Platforms Disagreed

Questions This Section Answers

  • Where did AI platforms disagree about arthritis-friendly stairlift controls and seating?
  • Which stairlift entity received the widest range of fit ratings across platforms?

Material disagreements include:

  • Bruno Elite control type. Google described a low-effort rocker ideal for limited hand dexterity [e1:google:1.1.5]; anthropic and grok described a constant-pressure rocker requiring sustained grip [e1:anthropic:c6][e1:grok:0]. Deepseek found no verifiable details at all [e1:deepseek:C1].
  • Acorn powered swivel availability. Perplexity reported that public materials do not confirm a powered swivel seat on the Acorn 130 [e2:perplexity:C1]; anthropic and google described a powered swivel upgrade as available [e2:anthropic:C3][e2:google:1.3.2].
  • Acorn weight capacity. The current U.S. product page publishes 280 pounds; an independent 2026 review refers to 300 pounds [e2:openai:c5].
  • Harmar UP standard versus optional features. Google described automatic power swivel and automatic folding footrest as standard on the UP [e3:google:up_stairlift_101mobility]; openai noted that a Harmar FAQ discusses these as options depending on model [e3:openai:c2].
  • Stannah warranty duration. Google reported a 1-year standard parts and labor warranty [e4:google:1.1.3]; grok reported a 2-year comprehensive warranty with free services [e4:grok:1]; perplexity reported that U.S. pages conflict between one-year and two-year descriptions [e4:perplexity:c11][e4:perplexity:c12].
  • Handicare 1100 warranty. Sources reported 24 months parts, 24 months parts plus limited lifetime powertrain, and 2 years with 10 years on motor and gearbox [e6:perplexity:c1][e6:perplexity:c14][e6:perplexity:c13].
  • Savaria Freecurve joystick. Perplexity reported that the checked sources do not clearly describe a joystick [e7:perplexity:c1]; openai and anthropic described an easy-to-push armrest joystick [e7:openai:freecurve_brochure][e7:anthropic:c1].
  • Savaria Freecurve warranty. The brochure describes limited lifetime rail and powertrain coverage; the detailed warranty specifies indoor motor and gearbox coverage as 10 years [e7:openai:savaria_warranty][e7:perplexity:c9].

How Buyers Should Choose

Questions This Section Answers

  • What should a buyer check before choosing a stairlift for arthritis-friendly controls and seating?
  • How should a senior with arthritis decide between a straight-stair and curved-stair stairlift?

Buyers should work through four decisions in order.

1. Confirm the staircase geometry. Straight staircases open the full field: Bruno Elite, Acorn 130, Harmar SL600, AmeriGlide Cardinal, and Handicare 1100. Curved, turning, or multi-landing staircases narrow the field to Harmar UP and Savaria Freecurve, or to a custom curved configuration from Bruno or Acorn [e1:openai:c1][e2:openai:c1][e3:openai:c2][e7:openai:freecurve_brochure].

2. Test the control with the buyer's actual hands. Control force is the least documented and most contested specification in this study. Buyers with hand arthritis should request an in-person demonstration of the exact control on the exact configuration before signing [e1:anthropic:c6][e5:google:1.1.9][e6:deepseek:handicare_1100_page].

3. Decide whether powered transfer aids are required. If the buyer cannot manually swivel a seat or fold a footrest, powered swivel and powered footrest should be treated as required rather than optional, and their cost should be confirmed in writing [e1:openai:c1][e2:openai:c6][e6:openai:c1][e7:openai:freecurve_brochure].

4. Verify warranty and service terms in writing. Public warranty descriptions conflicted for six of the seven qualifying entities. Buyers should obtain the exact written warranty for the exact model, including labor, batteries, service calls, and transferability [e1:openai:c7][e2:openai:c7][e4:openai:c_warranty_register][e3:openai:c6][e6:perplexity:c1][e7:openai:savaria_warranty].

For a broader view of the category, see the stairlifts directory.

Methodology

This study used one standardized prompt sent once to each of seven included platforms: openai, anthropic, deepseek, grok, perplexity, kimi, and google. The prompt asked each platform to identify the best stairlifts for arthritis-friendly controls and seating for seniors with arthritis in the hands, hips, knees, or back.

The ranking order is based on platform mentions, then average listed rank, then best listed rank. The final ranking table is the sole authority for rank, platform mentions, platform share, average listed position, and best listed position. Platform mentions count only ranking-discovery mentions; they do not represent the number of platforms that later completed a fit assessment.

Fourteen unique entities were named across platforms. Seven qualified by being named by at least two platforms. Entity evidence bundles were used as the authority for buyer fit, features, pricing, strengths, limitations, disagreements, and citations. The URLs were collected from platform responses and were not independently validated by the writer stage.

Methodology Limitations

  • This study used one standardized prompt sent once to each included platform. AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved.
  • Platform-reported research dates differ from the authoritative run date of 2026-09-27. Anthropic reported 2026-01-08 for Bruno, 2026-01-15 for Acorn, 2026-01-10 for Harmar, 2026-01-15 for Stannah, 2025-01-23 for AmeriGlide, 2025-01-10 for Handicare, and 2026-01-15 for Savaria. Deepseek reported 2026-06-12 for Acorn, 2026-06-01 for Harmar and Stannah, 2026-05-20 for Handicare, and 2026-06-11 for Savaria. These platform-reported dates are provenance metadata and do not independently prove freshness.
  • Platform recommendations are market intelligence, not independent customer reviews or proof of quality.
  • Citations are platform-reported evidence, not independently verified facts. No-search model claims require explicit verification before being described as current facts.
  • Company-owned citations materially outnumber independent citations for Acorn, Stannah, Harmar, AmeriGlide, and Savaria. Company claims should not be described as independently verified.
  • Official-site retrieval failed for one or more mentions of AmeriGlide, Handicare, and Savaria. No failed fetch was used as a verified domain key.
  • Company-name variants were collapsed onto one canonical brand before minimum-mentions qualification and resolved conflicting reported domains by strict multi-provider consensus.
  • Do not resolve conflicting product names, pricing, or capabilities by guessing. This report describes conflicts and tells buyers what to verify.

Final Verdict

The Bruno Elite SRE-2010 Stairlift is the consensus leader for arthritis-friendly controls and seating, named by all seven platforms at an average listed position of 1.86. Its combination of adjustable seating, 400 lb capacity, wireless remotes, and optional power swivel and power footrest makes it the most broadly recommended option, provided the buyer tests the constant-pressure control and confirms the cost of powered upgrades.

The Acorn 130 Stairlift is the strongest alternative for buyers who want independent third-party validation of control ease, thanks to its Arthritis Foundation Ease-of-Use Commendation. The Harmar UP Stairlift is the best fit for curved-stair households that need automatic power swivel and automatic folding footrest as standard. The Stannah entity is the best fit for buyers who prioritize a lifetime carriage motor gearbox warranty and a one-hand seatbelt. The AmeriGlide Cardinal is the lowest-priced option at $1,999 advertised. The Handicare 1100 offers the smoothest straight-stair ride. The Savaria Handicare Freecurve is the best fit for curved staircases needing powered transfer aids.

No single entity is best for every buyer. The right choice depends on staircase geometry, hand strength, hip and knee flexibility, weight capacity, and willingness to pay for powered upgrades.

Frequently Asked Questions

What is the best stairlift for seniors with arthritis in 2026?

The Bruno Elite SRE-2010 Stairlift is the consensus leader, named by all seven platforms studied. The Acorn 130 Stairlift is the strongest alternative for buyers who want independent Arthritis Foundation Ease-of-Use validation.

Do stairlifts for arthritis come with powered swivel seats as standard?

For most qualifying entities, powered swivel seats are optional upgrades rather than standard equipment. The Harmar UP Stairlift is the notable exception, with automatic power swivel described as standard on that model.

How much do arthritis-friendly stairlifts cost?

Advertised prices range from $1,999 for the AmeriGlide Cardinal Indoor Straight Stairlift to approximately $9,999 or more for a base Savaria Handicare Freecurve configuration before custom rail and installation. Most other entities require dealer quotes.

Can a stairlift help with hand arthritis?

Yes, if the control requires low force. The Acorn 130's large paddle controls and the Handicare 1100's joystick are described as requiring minimal pressure. Buyers should test the exact control in person before purchase.

What is the weight capacity of arthritis-friendly stairlifts?

Capacities range from 275 pounds (Harmar UP, AmeriGlide Cardinal, Savaria Freecurve) to 350 pounds (Harmar SL600) and 400 pounds (Bruno Elite SRE-2010).

Are curved stairlifts available for arthritis-friendly controls and seating?

Yes. The Harmar UP Stairlift and Savaria Handicare Freecurve Stairlift both address curved staircases, with powered swivel and powered footrest options.

What should a buyer verify before purchasing an arthritis-friendly stairlift?

Buyers should verify control force, seat height, swivel operation, armrest dimensions, footrest controls, warranty terms including labor and batteries, total installed price, and local dealer service response times.

Consolidated Sources

Company-Owned Sources

Independent Sources

Other Sources

Verify This Research

Review the study details behind this page or download the public machine-readable verification record.

Study date
September 27, 2026
Platforms analyzed
7
Source records
241
Candidates reviewed
14
Qualified finalists
7

Research trail and source mix

Configured platforms

openai, anthropic, deepseek, grok, perplexity, kimi, google

Source mix

93 independent · 127 company-owned · 21 unclear

Evidence support

180 direct · 55 partial

Important limitation

Exactly 7 platforms were included in this run: openai, anthropic, deepseek, grok, perplexity, kimi, google. The configured source value 7 is provenance only and must never be described as the number of platforms studied.

Source snapshot SHA-256 73e54a1e7b553e218fbe73474416c26a4b3e389827995d5fc0fed2a661b0e00a

Archived editions

Browse earlier published research snapshots for this article. The latest edition remains at the current URL.