AI Consensus Index

Best Medical Alert Systems with No Long-Term Contracts - 7-Platform AI Consensus Index

LifeStation is the consensus leader for contract-free emergency monitoring, named by 3 of 7 AI platforms with an average listed rank of 5.33 and a best rank of 4.

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Answer Capsule

LifeStation is the consensus leader for contract-free emergency monitoring, named by 3 of 7 AI platforms with an average listed rank of 5.33 and a best rank of 4. The strongest alternatives depend on buyer priorities: Alert1 offers the lowest-cost fall detection at $5 per month, Lively provides the best portable mobile device with month-to-month service, Rescue Alert delivers the most flexible equipment ownership options, and Aloe Care Health stands out for voice activation and caregiver app features. This study analyzed 52 unique entities across 7 AI platforms, with 5 entities qualifying by being named by at least two platforms. The principal limitation is that platform recommendations reflect market intelligence from AI research, not independent product testing or verified customer outcomes.

Research Snapshot

Topic: Best medical alert systems With No Long-Term Contracts — Contract-Free Emergency Monitoring

Target buyer: Seniors and families who want monitored emergency response without multi-year contracts, cancellation penalties, or hidden fees

Platforms included: openai, anthropic, deepseek, grok, perplexity, kimi, google (7 platforms)

Research date: 2026-08-10

Number of unique entities named: 52

Number of qualifying entities: 5

Eligibility rule: Named by at least two platforms during ranking discovery

Method: One standardized prompt sent once to each included platform

The Consensus Ranking

RankEntityPlatform MentionsAverage Listed PositionBest PositionBest Considered For
1LifeStation35.334Seniors wanting monitored emergency response without a long-term contract
2Alert136.673Seniors wanting month-to-month monitored protection at home without a landline
3Lively25.54Seniors who need mobile emergency monitoring at home and away
4Rescue Alert26.06Seniors who want monitored in-home response with monthly billing
5Aloe Care Health28.57Seniors who primarily need at-home monitoring with voice activation

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

Buyer NeedBest OptionWhy
Explicit no-contract promise with no cancellation penaltiesLifeStationMonth-to-month billing, no long-term contracts, no cancellation penalties, 30-day money-back guarantee
Lowest-cost fall detection add-onAlert1Fall detection at $5/month in recent NCOA testing, below the $10–$15 industry average
Portable mobile monitoring at home and awayLivelyLively Mobile2 works both in-home and on-the-go with GPS and two-way communication
Equipment ownership to avoid return obligationsRescue Alert$849 lifetime purchase or $199 equipment plus $15.95/month monitoring eliminates returns
Voice activation and caregiver app coordinationAloe Care HealthHands-free "emergency" voice calling plus real-time caregiver app monitoring
No landline required, cellular in-home systemAlert1EZ Care Plus operates on cellular networks with 600-foot range
Couples or multi-user householdsRescue AlertFree second help button with no extra monthly charge
Fastest independently tested response timesLifeStation20–49 second response times with TMA Five Diamond-certified centers
Lowest upfront costAlert1No equipment purchase fee; devices leased with service
Buyers willing to pay upfront for owned equipmentAloe Care Health$199.99 hardware purchase means the buyer owns the equipment

1. LifeStation

Verdict: LifeStation is a good fit for contract-free emergency monitoring, ranking first with 3 platform mentions and an average listed rank of 5.33. The company explicitly markets month-to-month billing with no long-term contracts and no cancellation penalties, backed by independently tested fast response times and TMA Five Diamond-certified monitoring centers. The main limitation is inconsistent public pricing, particularly a disputed $99.95 activation fee and unclear equipment-return terms.

Why it ranked here: LifeStation received the most platform mentions (3) and the best average rank among qualifying entities, with Grok rating it a "strong fit" specifically for its explicit month-to-month options.

Best suited for: Seniors wanting monitored emergency response without a long-term contract; families seeking an in-home cellular system for a senior who is usually home; active seniors needing a mobile GPS-enabled device with two-way communication.

Main strengths: LifeStation offers genuine month-to-month billing with no long-term contracts and no cancellation penalties [1]. The company provides a 30-day money-back guarantee with full refund on return [3]. Independent testing found fast response times: 49 seconds for Sidekick Mobile [4], 42-second average per SafeWise [5], and approximately 20 seconds per SeniorSite [6]. Monitoring centers are TMA Five Diamond-certified, UL-listed, and FM-approved [7]. Both Sidekick Home and Sidekick Mobile operate on cellular networks without requiring a landline [1].

Main limitations: The $99.95 activation fee is disputed — LifeStation's own page claims no activation fees [8], but multiple independent sources report the fee applies to most devices [9]. Fall detection pricing ranges from $6–$16 per month depending on source [12]. Independent testing found the Sidekick Home failed to detect falls in all three testing rounds [14], and Forbes Health found the Sidekick Mobile missed three simulated falls [4]. Full pricing requires phone consultation rather than online disclosure [15]. Equipment return shipping is not free after the 30-day guarantee period [17].

Pricing summary: Sidekick Home $34.95–$38.95/month; Sidekick Mobile $38.95–$41.00/month; activation fee $0–$99.95 (disputed); fall detection $6–$16/month; shipping $12.50 (waived with quarterly/annual payment); protection plan $7.95–$8/month.

Where platforms disagreed: Five platforms rated LifeStation "good," one rated it "strong" (Grok), and two rated it "uncertain" (Kimi, Perplexity) due to insufficient verifiable evidence. The activation fee conflict between $0 and $99.95 was the most significant disagreement.

LifeStation

2. Alert1

Verdict: Alert1 is a good fit for contract-free emergency monitoring, ranking second with 3 platform mentions and an average listed rank of 6.67. The company offers genuine month-to-month billing with no stated cancellation penalties, no equipment purchase fees, and low-cost fall detection at $5 per month in recent independent testing. The main limitation is inconsistent public pricing and fee information, plus the practical burden of equipment return to stop billing.

Why it ranked here: Alert1 tied with LifeStation for platform mentions (3) but had a higher average listed rank (6.67 vs. 5.33), placing it second. OpenAI gave Alert1 its best rank of 3.

Best suited for: Seniors wanting month-to-month monitored protection at home without a landline using EZ Care Plus; users who need mobile coverage and GPS through LifeBeacon On-the-Go; price-sensitive buyers willing to document cancellation and equipment return carefully.

Main strengths: Alert1 offers genuine month-to-month billing without long-term contracts, and members can cancel anytime without cancellation charges [18]. Equipment is leased with service, with no equipment purchase cost [20]. NCOA testing recorded fall detection at $5 per month, below the industry average of $10–$15 [22]. The monitoring center holds CSAA Five Diamond certification [24], and NCOA testing recorded a 36-second average response time [22]. The EZ Care Plus operates on cellular networks with a reported 600-foot range [22].

Main limitations: Activation fees are inconsistently reported — NCOA found no activation fee [22], while Forbes reported $19.95 [25]. Fall detection pricing ranges from $5 to $10 per month depending on source [22]. Alert1's official refund policy states no refunds on annual plans for early cancellation except for death or nursing home transition [27]. Equipment must be returned to stop billing, with unreturned equipment triggering charges up to $595 [27]. The 30-day money-back guarantee applies only to the 10-month prepaid plan, not month-to-month customers [29]. Alert1 lacks a caregiver mobile app [30].

Pricing summary: EZ Care Plus $39.99–$40/month; LifeBeacon $44.99–$45/month; fall detection $5–$10/month; activation fee $0–$19.95; protection plan $60/year or $8.33/month.

Where platforms disagreed: Perplexity and Kimi rated Alert1 "uncertain" because their search results lacked independently verifiable pricing data. Anthropic rated "good," DeepSeek "strong," Google "good," Grok "strong," and OpenAI "good." The activation fee and refund policy conflicts were the most significant disagreements.

Alert1

3. Lively

Verdict: Lively is a good fit for contract-free emergency monitoring, ranking third with 2 platform mentions and an average listed rank of 5.5. The Lively Mobile2 provides portable cellular monitoring that works at home and away, with month-to-month service and no stated cancellation penalties. The main limitation is the upfront cost structure: a $79.99 device purchase, a typically stated $35 activation fee, and a $9.99/month optional fall-detection add-on.

Why it ranked here: Lively received 2 platform mentions (DeepSeek and Google) with Google giving it a best rank of 4. Its average listed rank of 5.5 was better than Alert1's 6.67, but fewer platform mentions placed it third.

Best suited for: Seniors who need mobile emergency monitoring at home and away from home; families wanting optional fall detection and location-aware response; buyers prioritizing month-to-month service over the lowest possible total cost.

Main strengths: Lively states no long-term contracts and permits cancellation at any time [32], confirmed by independent reviews [33]. The Lively Mobile2 is a portable device with two-way communication, GPS-based location features, and access to Urgent Response [36]. The Urgent Response team is U.S.-based and available 24/7 [37]. Independent testing shows average response times of 13–26 seconds [38]. The device operates on the Verizon cellular network [39].

Main limitations: The device costs $79.99 upfront [40], and a typical $35 activation fee may apply [42]. Fall detection costs $9.99/month extra [44]. Cancellation proration is disputed — OpenAI states no proration [46], while Google reports prorated refunds [35]. The Lively Wearable 2 appears discontinued, and Lively does not appear to offer dedicated home systems [47]. Fall detection requires wearing the device on the supplied lanyard and does not work with the clip or wristband accessory [48].

Pricing summary: Lively Mobile2 device $79.99 one-time; Basic plan $24.99/month (paperless) or $29.99/month (paper billing); Premium plan $34.99/month (paperless) or $39.99/month (paper billing); Fall Detection $9.99/month; activation fee $35 typical, possibly $0; protection plan $2.50/month.

Where platforms disagreed: The prorated refund policy was the most significant conflict — Google states prorated refunds [35], OpenAI states no proration [46], and The Senior List states prorated refunds after 30 days [49]. The activation fee also conflicted between $35 [42] and $0 [50].

Lively

4. Rescue Alert

Verdict: Rescue Alert is a good fit for contract-free emergency monitoring, ranking fourth with 2 platform mentions and an average listed rank of 6.0. The company offers genuine month-to-month billing with no long-term contract, no activation fees reported by most sources, and prorated refunds on prepaid plans. The main limitation is inconsistent public pricing and the absence of fall detection on the GPS device.

Why it ranked here: Rescue Alert received 2 platform mentions (DeepSeek and OpenAI) with a best rank of 6. Its average listed rank of 6.0 placed it between Lively (5.5) and Aloe Care Health (8.5).

Best suited for: Seniors who want monitored in-home response with monthly billing and no reported long-term contract; buyers who need a simple mobile GPS device for use outside the home; couples or housemates sharing an in-home system.

Main strengths: Rescue Alert explicitly markets "No Long Term Contracts! No Hidden Fees!" with month-to-month monitoring and cancellation at any time [51]. Multiple independent sources report no activation, setup, programming, or shipping fees on standard plans [53]. Prepaid quarterly or annual plans receive prorated refunds for unused months upon equipment return [55]. Equipment ownership options include a one-time $849 purchase with lifetime monitoring or $199 equipment plus $15.95/month monitoring [57]. In-home systems include a free additional help button for two users [52].

Main limitations: Pricing varies widely across sources — DeepSeek reported In-Home at $19.95/month [59], while OpenAI reported $32.95/month [53]. Fall detection costs $10/month extra and is not available on the GPS device [60]. TechRadar's independent testing found the myActive Alert fall detection pendant unreliable, consistently failing to detect falls [61]. Equipment replacement fees are $234 for a lost base unit and $35 per pendant [62]. No independent response-time data was located to verify company claims [53].

Pricing summary: MXD landline $27.95–$32.95/month; MXD3G cellular $42.95/month; Rescue Alert GPS $34.95–$44.95/month; fall detection $10/month; equipment purchase $849 lifetime or $199 plus $15.95/month; activation fee $0 standard, up to $30 via some regional distributors.

Where platforms disagreed: DeepSeek reported significantly lower pricing ($19.95/month in-home) than other platforms. DeepSeek also claimed fall detection is included at no extra charge [59], conflicting with all other sources and the official pricing page. Perplexity and Kimi rated Rescue Alert "uncertain" due to insufficient verifiable information.

Rescue Alert

5. Aloe Care Health

Verdict: Aloe Care Health is a good fit for contract-free emergency monitoring, ranking fifth with 2 platform mentions and an average listed rank of 8.5. The company offers true month-to-month structure with no long-term contract, no cancellation penalties, and no activation fee, paired with a voice-activated hub and caregiver app that most competitors lack. The main limitation is the $199.99 upfront equipment purchase and the absence of automatic fall detection on the base Essentials plan.

Why it ranked here: Aloe Care Health received 2 platform mentions (DeepSeek and Google) with a best rank of 7. Its average listed rank of 8.5 was the highest among qualifying entities, placing it fifth.

Best suited for: Seniors who primarily need at-home monitoring; families wanting voice activation, a wearable help button, and caregiver-app coordination; buyers willing to pay an upfront equipment cost rather than rent equipment.

Main strengths: The published Terms of Service state the agreement is month-to-month unless a different term is selected [63]. Cancellation does not incur termination fees or penalties [64]. There is no standard activation, programming, or setup fee [67]. The Smart Hub allows hands-free emergency calls by saying "emergency" [67]. The caregiver app provides real-time monitoring, activity tracking, and coordination among multiple caregivers [67]. The 4G hub does not require home Wi-Fi [67]. A 30-day money-back guarantee provides full refunds on purchased equipment and service [64].

Main limitations: The Essentials plan requires a $199.99 one-time hardware purchase [67]. Automatic fall detection is not included with the base Essentials plan [67]. Cancellation requires 30 days' written notice [63]. Monthly rates can increase at any time under the published terms unless prepaid annually [63]. The wall fall detection sensor costs $99.99 one-time plus $10/month and is available by phone only [75]. Independent testing produced conflicting response-time results — U.S. News reported good response times [77], while Forbes Health reported slow response times and described fall detection as "spotty at best" [78].

Pricing summary: Essentials $39.99/month; one-time hardware $199.99; activation fee $0 (per most platforms); wall fall detection sensor $99.99 + $10/month; additional caregiver button $29.99; first-year base cost approximately $679.87.

Where platforms disagreed: DeepSeek reported a $99 activation fee [79], while OpenAI, Anthropic, Google, and Grok reported no activation fee [67]. DeepSeek's research date of 2026-04-08 predates the other platforms' 2026-08-10 date, which may explain the discrepancy. Monthly price also conflicted slightly between $39.99 and $39.95.

Aloe Care Health

What the Cross-Platform Study Reveals About This Market

The contract-free emergency monitoring market is characterized by genuine month-to-month availability across all five qualifying providers, but pricing transparency remains a systemic problem. Every ranked entity had at least one material pricing conflict that buyers must resolve directly with the company before ordering.

Activation fees are the most contested cost item across the market. LifeStation's fee is disputed between $0 and $99.95, Alert1's between $0 and $19.95, Lively's between $0 and $35, and Aloe Care Health's between $0 and $99. The only provider with consistent no-activation-fee reporting is Rescue Alert, though one regional distributor charges up to $30.

Equipment return terms are the second major friction point. LifeStation requires equipment return before billing stops, Alert1 charges up to $595 for unreturned equipment, Lively requires return within 30 days with a possible $10 restocking fee, Rescue Alert charges $234 for a lost base unit, and Aloe Care Health's published terms require return of company-owned equipment with the customer bearing shipping costs.

Fall detection is universally an add-on rather than a base feature across all five providers. Costs range from Alert1's $5/month to Lively's $9.99/month, LifeStation's $6–$16/month, and Rescue Alert's $10/month. Aloe Care Health does not display a current Essentials fall-detection price on its product page.

Where the AI Platforms Agreed

All platforms that provided substantive evidence agreed that each of the five qualifying entities offers month-to-month billing without long-term contracts. This was the single most consistent finding across the study.

All platforms agreed that none of the five providers charges a stated cancellation penalty or early termination fee on month-to-month plans. The practical burden of equipment return, not a stated penalty, is the primary cancellation friction.

Platforms agreed that fall detection is an optional add-on across all five providers, not included in base plans. Costs vary from $5 to $16 per month depending on provider and device.

Platforms agreed that monitoring center certifications are strong across the market: LifeStation holds TMA Five Diamond certification, Alert1 holds CSAA Five Diamond certification, and Aloe Care Health uses a Five Diamond Certified monitoring center.

Platforms agreed that equipment return is required to stop billing for all rental-based providers. The only exception is equipment ownership options at Rescue Alert and Aloe Care Health, where purchased equipment does not need to be returned.

Where the AI Platforms Disagreed

The most significant disagreement concerned activation fees, with every provider except Rescue Alert having conflicting reports. LifeStation's $99.95 fee was the most contested, with the company's own page claiming no activation fees while multiple independent sources reported the charge.

Cancellation refund proration was disputed for Lively. OpenAI stated cancellation is not prorated and takes effect at the end of the current billing cycle [80], while Google reported prorated refunds for unused service days [81], and The Senior List reported prorated refunds after 30 days [82].

Fall detection reliability produced conflicting independent test results. LifeStation's Sidekick Home failed all three fall-detection tests per U.S. News [83], while the Sidekick Mobile performed better. Rescue Alert's myActive Alert pendant consistently failed to detect falls per TechRadar [84]. Aloe Care Health's fall detection was described as good by U.S. News [85] but "spotty at best" by Forbes Health [86].

Pricing transparency was rated poorly across the market. LifeStation requires phone consultation for full quotes [87], Alert1's month-to-month rates are not consistently published [88], and Aloe Care Health does not display current fall-detection add-on pricing [89].

Two platforms (Perplexity and Kimi) rated multiple entities "uncertain" because their search results lacked independently verifiable data. This reflects gaps in available evidence rather than negative findings about the providers.

How Buyers Should Choose

Start by confirming the exact total first-month cost directly with the provider. Every ranked entity had at least one disputed fee — activation fees, shipping charges, and fall-detection add-on costs varied across sources. Ask for a written quote that itemizes monthly monitoring, activation, shipping, taxes, and any add-ons.

Verify the cancellation procedure in writing before ordering. Confirm whether billing stops on the cancellation request date, shipment date, delivery date, or warehouse processing date. Ask who pays return shipping and what charges apply for missing or damaged equipment.

Decide whether equipment ownership or leasing better fits your situation. Rescue Alert's $849 lifetime purchase and Aloe Care Health's $199.99 hardware purchase eliminate return obligations entirely. Leasing models from LifeStation, Alert1, and Lively require equipment return to stop billing.

Match the device form factor to the senior's lifestyle. Lively Mobile2 and LifeStation Sidekick Mobile provide portable GPS coverage for active seniors. LifeStation Sidekick Home, Alert1 EZ Care Plus, Rescue Alert MXD, and Aloe Care Health Essentials serve primarily homebound users.

Evaluate fall detection needs carefully. If automatic fall detection is a critical safety feature, note that independent testing found reliability issues with LifeStation's Sidekick Home and Rescue Alert's myActive Alert pendant. Alert1's $5/month fall detection was the lowest-cost option in recent testing.

Confirm cellular coverage at the senior's home and regular travel locations. All five providers use cellular networks — Lively operates on Verizon, Rescue Alert uses AT&T, and the others use unspecified cellular networks. Devices may have diminished capabilities where coverage is limited.

Methodology

This study aggregated fit-research responses from seven AI platforms: OpenAI, Anthropic, DeepSeek, Grok, Perplexity, Kimi, and Google. Each platform received one standardized prompt asking it to evaluate medical alert systems for contract-free emergency monitoring against seven criteria: month-to-month pricing, cancellation policy, equipment return terms, activation fees, fall-detection add-on cost, response reliability, and pricing transparency.

The research date is 2026-08-10. Platform-reported research dates differed for some platforms: DeepSeek reported 2026-03-27 for LifeStation, 2026-04-11 for Alert1, 2025-10-04 for Lively, 2026-04-10 for Rescue Alert, and 2026-04-08 for Aloe Care Health. These date discrepancies are disclosed as methodology limitations.

Entities qualified for ranking by being named by at least two platforms during the ranking discovery stage. The final ranking was determined by platform mentions, then average listed rank, then best listed rank. All seven platforms evaluated each entity's fit during the fit-research stage, but platform mentions count only ranking-stage naming.

The evidence audit identified 117 deduplicated citations across the five qualifying entities. Sources were categorized as company-owned (provider websites and official policies) or independent (review sites, testing organizations, and consumer advocacy groups).

Methodology Limitations

AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved. This study used one standardized prompt sent once to each platform on the research date, and results may differ with different prompts or dates.

Platform recommendations are market intelligence, not independent customer reviews or proof of quality. Agreement among AI platforms reflects consistency in their research findings, not independent verification of product performance.

The supplied URLs were collected from platform responses and were not independently validated by the writer stage. Some citations may be outdated or contain errors.

Platform-reported research dates differed from the authoritative run date for DeepSeek across all entities. Pricing and terms may have changed between the platform's research date and 2026-08-10.

Company-owned sources may present favorable terms. Independent reviews may contain errors or outdated information. This study distinguishes company-owned from independent sources but does not independently verify either.

No personal testing, customer experience, medical benefit, or guaranteed performance is claimed. Independent fall-detection and GPS testing results differ by model and should not be generalized across all devices from a provider.

BBB complaints are individual allegations included as reported by platforms. They do not prove a general billing practice or service failure.

Final Verdict

LifeStation is the consensus leader for contract-free emergency monitoring, offering the strongest combination of explicit no-contract terms, no cancellation penalties, certified monitoring centers, and fast independently tested response times. The disputed $99.95 activation fee and unclear equipment-return terms are the main risks buyers must verify before ordering.

Alert1 is the strongest alternative for price-sensitive buyers, with the lowest-cost fall detection at $5 per month and no equipment purchase fee. Lively is the best choice for seniors who need portable mobile monitoring at home and away. Rescue Alert offers the most flexible equipment ownership options, eliminating return obligations entirely. Aloe Care Health stands out for voice activation and caregiver app features that most competitors lack.

All five providers deliver on the core contract-free promise: month-to-month billing with no long-term contracts and no stated cancellation penalties. The practical differences lie in activation fees, equipment return requirements, fall-detection costs and reliability, and pricing transparency. Buyers should verify the exact total first-month cost and the written cancellation procedure with the provider before ordering.

For a broader comparison of no-contract options, browse all medical alert systems in our category directory.

Frequently Asked Questions

Which medical alert system has no long-term contract?

All five qualifying providers — LifeStation, Alert1, Lively, Rescue Alert, and Aloe Care Health — offer month-to-month billing with no long-term contracts. LifeStation ranked first in this study with the strongest platform consensus.

Is there a medical alert system with no activation fee?

Rescue Alert reported no activation fees on standard plans across most sources. LifeStation, Alert1, Lively, and Aloe Care Health all had conflicting activation fee reports ranging from $0 to $99.95 depending on the source.

Which medical alert system has the cheapest fall detection?

Alert1 offers fall detection at $5 per month in recent NCOA testing, below the industry average of $10–$15 per month. Lively charges $9.99/month, Rescue Alert charges $10/month, and LifeStation charges $6–$16/month depending on device and plan.

Do I have to return equipment when canceling a medical alert system?

For rental-based plans, yes. LifeStation, Alert1, Lively, and Rescue Alert require equipment return to stop billing. Rescue Alert and Aloe Care Health offer equipment purchase options that eliminate return obligations.

Which medical alert system is best for active seniors who leave home?

Lively Mobile2 and LifeStation Sidekick Mobile are portable GPS devices with two-way communication. Lively ranked highest for mobile monitoring in this study, with the device working both at home and away.

Are there cancellation penalties for month-to-month medical alert plans?

None of the five qualifying providers charges a stated cancellation penalty on month-to-month plans. The practical burden is equipment return and, in some cases, a 30-day written notice requirement.

Which medical alert system has the fastest response time?

LifeStation had the fastest independently tested response times at 20–49 seconds, with TMA Five Diamond-certified monitoring centers. Alert1 recorded a 36-second average response time with CSAA Five Diamond certification.

Do any medical alert systems include fall detection in the base price?

No. All five qualifying providers charge extra for fall detection as an add-on. Costs range from Alert1's $5/month to LifeStation's $6–$16/month, Lively's $9.99/month, and Rescue Alert's $10/month.

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Study date
Aug 10, 2026
Platforms analyzed
7
Source records
117
Candidates reviewed
52
Qualified finalists
5

Research trail and source mix

Platforms

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

Source mix

73 independent · 43 company-owned · 1 unclear

Evidence support

101 direct · 15 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.

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