Oura · CHI Company Investigation · Technology & Software
OuraOura Inc. / Oura Health Oy · Filed for a US IPO, Sep 2026 · Oura Ring Gen3, Ring 4, Ring 4 Ceramic and Ring 5, Oura Membership, data export and integrations · Ring owners and members
Conclusion: Partially Supports · Scope: what an Oura Ring owner keeps, and what they can take out, after paying for the hardware · Not a finding that the subscription itself is hostile · No score assigned
You own the ring. Your data leaves it on Oura’s terms.
Oura runs a disclosed, stably priced subscription with several customer-favourable practices. The CHI finding is narrower than “a ring that needs a subscription”. A Gen3, Ring 4 or Ring 5 owner who stops paying keeps the ring, three daily scores and a delayed batch export, and loses every live route out: Apple Health, Health Connect, Strava, Natural Cycles and the Oura API. Gen2 owners keep those routes free. Reserved contractual control, a remote-disable capability and a battery arrangement with no published post-warranty path complete the finding.
Metered egress on owned hardware.
The CHI concern is not that Oura charges a subscription. Charging for analysis, new features and cloud processing is ordinary. The concern is where the line was drawn: the ring the customer owns keeps measuring, but the results can no longer leave Oura’s app in real time unless the customer keeps paying.
The ring, three numbers and a delayed copy.
- The physical ring; Oura’s Terms do not purport to retain title1
- Readiness, Sleep and Activity as three daily scores2
- Ring battery, basic profile, app settings and Explore content2
- All data kept on Oura’s servers until the account is deleted2
- A full CSV export through the Membership Hub, which can take up to 10 days11
Everything that explains the numbers, and every live exit.
Why the egress line matters. Charging for interpretation is defensible. Writing an already-computed sleep stage to Apple Health is a different service, and Oura provides it to Gen2 owners free. CHI reads the egress gate as what keeps the free tier from working as a usable alternative. CHI reading
Eight current findings, in order of weight.
- Live data egress is membership-gated on Gen3+ hardware.Apple Health, Health Connect, Strava and Natural Cycles are each listed as available for “Gen2” and “Gen3 or later with active membership”. Without membership, “you cannot access the Oura API”; batch export remains.2,4,5,6,7,9Current
- The non-member residual is narrow.“Without an active membership, you’ll only be able to see your three daily Oura scores (Readiness, Activity, and Sleep), ring battery, basic profile information, app settings, and the Explore content.”2Current · disclosed
- The Terms reserve control over what will require payment.“ŌURA reserves the sole discretion to determine which Services or portions thereof require payment”, and may “modify or discontinue, temporarily or permanently, the Services”.1Reserved · not exercised against purchased rings
- Oura can disable specific rings.“A disabled ring can’t pair with the Oura App or collect new data.” Warranty-replaced originals are not recalled and may be disabled; no public serial-status check was found.14,15Current
- A Ring 4 battery issue was disclosed in an IPO filing.“Certain cohorts of Oura Ring 4 have exhibited battery performance issues”, driving an $84.4 million increase in warranty expense. No public consumer notice identifying affected rings was found.17,20Current
- No repair or post-warranty path.Sealed battery excluded from warranty; no battery service, repair or trade-in; one-year US warranty.15,17,19Current · category context applies
- Oura on the Web was discontinued on 5 October 2026.Its correlation tool and instant export have no in-app equivalent. Data remains exportable.2,22Current · service removal
- Re-consent is required to keep using the app.“After that date, you can’t use the Oura App until you accept” the Terms effective 4 November 2026.13Announced · lower weight
Not on this list: the membership price, cancellation, hardware support and generational re-gating. On each, the evidence cuts in Oura’s favour (sections 09–12). CHI reading
The ring keeps working. What it tells you shrinks to three numbers.
Cancelling is easy and nothing is deleted. What a Gen3, Ring 4 or Ring 5 owner can still use afterwards is set out in Oura’s own support article.2
You keep
- The ring, which keeps recording and syncing to the app CHI reading
- Readiness, Sleep and Activity as three daily scores2
- Ring battery, basic profile, app settings and Explore content2
- Your data, “securely saved” while the account exists2
- A full CSV export, “with or without active membership”, delivered within up to 10 days11
You lose
- Score contributors, sleep stages, heart rate, HRV, temperature, SpO22
- Graphs, Trends, Body Clock and weekly to yearly reports2,12
- Stress, Resilience, Cardiovascular Age, Cardio Capacity, Symptom Radar, Health Radar2
- Cycle, Fertile Window, Pregnancy and Menopause Insights; Glucose and Meals; Oura Labs and Advisor2
- Apple Health, Health Connect, Strava, Natural Cycles and the API4,5,6,7,9
Re-subscribing restores everything. “Once you re-enroll in Oura Membership, your data and account information will immediately be accessible again.”2 The non-member residual has been essentially unchanged since the Gen3 launch in October 2021; Explore content is the only later addition.2,49
Precise wording. Oura does not disable a ring for non-payment. That it keeps recording is CHI’s inference: the three scores need nightly data. Whether lapsed owners can view past scores or receive firmware updates is not stated. CHI reading
You can always get a copy. You cannot keep it flowing.
Two different things get called “data portability”. A batch export gives a copy of what exists; live interoperability keeps the ring feeding the apps the customer uses. Oura protects the first for everyone and sells the second.
“Expired Oura Membership. Problem: The user’s Oura membership has expired. Solution: The user needs to renew their Oura membership to restore API access.”
Oura API v2 documentation, troubleshooting, read 17 Oct 2026
The data itself is not locked away. Oura’s Privacy Policy says it “does not sell or rent your personal information”, and neither it nor the Terms claims ownership of members’ health data; in 2025 Oura added that it “will never sell or rent your health data, including to the government”.38,39 Personal API tokens were withdrawn in December 2025; members now register an OAuth application, a higher bar for non-developers.10
Not established. When the gate on the API and platform sync began, and whether Gen3 non-members ever had that access, could not be confirmed. This page does not say those routes were taken from anyone; it says they are membership features today. CHI reading
Oura has kept wide discretion. It has used little of it.
Oura’s contract is silent on who owns the ring and explicit about who controls everything around it. Nothing purports to retain title to the hardware; everything the customer interacts with is defined as licensed “Services”.1
What will require payment
Whether services continue
The investor-facing version. Oura’s September 2026 S-1 says the company has “maintained consistent pricing” since 2021, and that “we expect to have opportunities to evolve pricing and packaging over the long term in a manner aligned with delivered value”.17 That is a stated intention, not an implemented change.
Re-consent, in proportion. Requiring acceptance of updated terms is ordinary for apps. It matters more here because the ring has no screen or export path outside the app, so declining means setting the hardware aside. Oura gave about three weeks’ notice and says the update “does not change how Oura collects, uses, or protects member data”.1,13
Precise wording. No instance was found of Oura using these clauses to gate a function a ring was sold with, or to raise an existing member’s price. This is reserved control, not exercised control. CHI reading
Physical possession is not the same as a working ring.
Oura makes resale easy in the ways that usually matter: published hand-over steps, a factory reset, and no activation or transfer fee.16 The asymmetry is a per-device blocklist the buyer cannot see.
“A disabled ring can’t pair with the Oura App or collect new data.”
Oura support, “Disabled Oura Ring”, updated 7 Oct 2026
The policy has a legitimate purpose: it stops a replaced ring being used twice and discourages resale of lost or stolen units. In the warranty-replacement case, its cost falls on a good-faith second buyer with no way to check the ring’s history. Oura offers a review route; rings disabled after a loss report “may not be eligible for re-enablement”. Locate, for finding a lost ring, is a membership feature.14,45 Warranty cover itself does not pass to second owners, which is ordinary across the category.15
September 2026 press relayed second-hand buyers’ reports of rings disabled weeks after purchase; Oura did not comment.41 Allegation The finding rests on Oura’s own policy pages, not those reports.
Comparison. Peloton charges $95 to activate used equipment; WHOOP delivers hardware inside the membership. Oura’s resale structure is the cleanest of the three; the blocklist is the exception. Peloton · WHOOP CHI reading
A sealed battery, a one-year warranty and no published path after it.
Every major smart ring is sealed, and CHI does not treat that as hostile in itself. The issue is what Oura offers once a battery wears or fails outside warranty, and how it communicated a battery problem it disclosed to investors.
Oura’s warranty covers the original purchaser for one year from delivery in the US, extended where local law requires; it excludes “consumable parts, including batteries”.1,15 Oura publishes per-charge battery life and care advice but no expected lifespan in years or cycles, and no degradation threshold that would trigger service.19 The only end-of-life route is recycling, with no credit: “We do not currently operate a formal trade-in or repeat purchaser discount program.”17,46 A June 2026 teardown found the Ring 5’s shell epoxy-bonded around a 10.5 mAh cell, with no practical way to replace the battery without damaging the ring.21 An Extend protection plan adds accidental-damage cover in the US at $45 for two years or $60 for three.33
The Ring 4 battery cohorts
“Certain cohorts of Oura Ring 4 have exhibited battery performance issues, which has resulted in increased warranty claims and warranty-related costs as we have replaced affected Oura Rings free of charge under our warranty and, in some cases, outside of the warranty period.”
Oura Inc., Form S-1, filed 3 Sep 2026
The filing attributes an $84.4 million increase in warranty expense to these cohorts.17 Oura replaced rings at scale, sometimes beyond warranty, and this page credits that in full. No public consumer notice identifying affected rings, purchase windows or an eligibility rule was found; Oura’s Ring 4 battery page, updated 21 September 2026, does not mention the issue.20 An owner who did not contact support had no published way to check whether they were covered.
CHI arithmetic. Weekly charging is about 52 cycles a year; small lithium cells typically lose noticeable capacity after a few hundred, roughly three to five years. A three-year Ring 4 owner spends about $349 plus $210 in membership, with two of those years outside warranty and no repair path. Oura called December 2025 overheating reports “isolated incidents”; no recall was found. CHI arithmetic
A paid analysis tool removed, with banners for notice.
“Oura on the Web has been discontinued as of October 5, 2026. Your data is still available in the Oura App and can be downloaded through the Membership Hub.”2
Until 4 Oct 2026
From 5 Oct 2026
Oura’s February 2024 post marketed the dashboard’s correlation coefficient, 5-minute HRV and resting heart rate, longer ranges and export.22 It was a Gen3+ member feature, so everyone who lost it was a paying hardware owner. No price change, credit or substitute accompanied the removal.11,12
Notice. A banner appeared in the support article on 22 June 2026 saying the dashboard would close “later this year”. Press relayed a support representative’s informal “until September”.23 Press No blog post, press release or in-app release note announcing the closure was found. The API and its developer documentation survived the shutdown.10
Precise wording. This is the one case in the record where Oura removed functionality from existing paying customers, and it was a web service, not a feature of the ring. Data availability was preserved; analysis and convenience were reduced. Severity: moderate. CHI reading
Five years, three hardware generations, one membership price.
Paid membership arrived with Gen3 on 26 October 2021 at $5.99 a month, with six free months for new buyers. Gen1 and Gen2 had been sold with full app functionality and no recurring fee.24,25
The day after Ring 4 was announced, Oura confirmed that “if you wish to purchase the new Oura Ring 4, your membership will not be affected”; lifetime benefits now “seamlessly transfer to any new or replacement ring”.2,26 The trial cut applied only to later purchases; its exact date is not established.
Cost in context. A $349 Ring 4 on the annual plan costs about $559 over three years and $699 over five. That three-year cost is close to WHOOP’s cheapest tier and $130–$260 above the subscription-free Samsung, Ultrahuman and RingConn rings. Oura is the only major smart ring whose full function requires a paid membership.3,42 CHI arithmetic
Old rings are frozen, not switched off. Gen3 is still current.
Every software feature Oura has launched since October 2021 carries the same gate: “Gen3 or later with active membership”. Nothing is reserved for Ring 4 or Ring 5 except multi-ring support.27,30
A 2021 Gen3 has since received Daytime Stress and Resilience (2023), Cardiovascular Age and Cardio Capacity (2024), Symptom Radar, Oura Advisor and, in 2026, Health Radar, Menopause Insights and Live Activity.36,37,44,27 Gen2’s exclusion has a stated sensor basis for most of these, and Gen2 owners never pay. In 2021 Oura promised Gen2 updates “for up to 2 years post Gen3 release”; its last Gen2 firmware is dated October 2022 and its last Gen2 iOS app June 2022.28,29,50
Cadence and upgrades. No upgrade discount was offered for Ring 4 or Ring 5, and Ring 5 followed Ring 4 after 20 months, against 36 before. Oura’s chief executive said in 2025: “we don’t actually need you to upgrade the hardware because you’re a subscriber”.17,43 Oura’s contract publishes no minimum support period for any generation.1 CHI reading
Leaving is simple. The terms are ordinary.
Members “may cancel at any time, online and without any further steps”, in the app or the web Membership Hub. Access runs to the end of the paid period, data is kept, and re-enrolment is instant.1,2
In the customer’s favour
- Self-service cancellation in two places; no retention step documented1,2
- Hardware returns within 30 days, for any reason, with a prepaid label31,32
- No restocking fee; a free sizing kit before the ring ships31
- A 28-day grace period after a failed payment18
- Outside the US, a 14-day full refund of unused membership1
Ordinary limits
- No pro-rata refund on annual plans after the free month; no pause option2
- A card is required to start the free month, which then converts automatically48
- One return or exchange per item; exchanges are size-only; no Gen3 exchanges31
- Membership must be cancelled separately when a ring is returned31
- Binding individual arbitration and a class waiver in the US1
A California auto-renewal class action, Lekhadia v. Oura Health Oy, filed in December 2025, alleged inadequate renewal disclosures and cancellation mechanisms. Oura moved to compel arbitration in April 2026, and the plaintiffs voluntarily dismissed the case two weeks later.34 Allegation The claims were never tested. Two pending 2026 class actions concern sleep-accuracy marketing, not post-purchase control.35 No FTC, state or European regulator action was found.
The balance. No disproportionate exit friction was established. The 30-day any-reason return exceeds the EU and UK 14-day statutory minimum. CHI reading
Why the conclusion is Partially Supports, not Supports.
The strongest evidence against a hostile reading, credited in full. On price, support and exit, Oura’s record is better than its category’s.
Held for five years
Old rings keep getting new features
Commitments kept
Easy to leave, data kept
Conservative claims
The balance. These counterweights defeat any broad claim of hostility. They do not change the egress gate, the reserved discretion, the blocklist’s effect on second-hand buyers or the absence of a published battery path. CHI reading
A subscription introduced in 2021, held steady, and tightened at the edges.
- Nov 2017Gen2 launches with full app functionality and no feeHistorical
- 26 Oct 2021Gen3 and paid membership at $5.99 a month; Gen2 upgraders offered lifetime membershipOura
- By Apr 2023Free period for new buyers reduced from six months to oneOura
- 2023 – 2024Stress, Resilience and cardiovascular features reach Gen3Oura
- 4 Oct 2024Oura confirms lifetime membership carries to Ring 4Oura
- Dec 2025Personal API access tokens withdrawn; OAuth app requiredOura
- 26 Dec 2025California auto-renewal class action filed; dismissed by plaintiffs 24 Apr 2026Court
- 4 Jun 2026Ring 5 ships; same membership price; no upgrade offerOura
- 22 Jun 2026Banner says Oura on the Web will close “later this year”Oura
- 3 Sep 2026S-1 discloses Ring 4 battery cohorts and $84.4M warranty expense increaseSEC filing
- 5 Oct 2026Oura on the Web discontinuedOura
- 4 Nov 2026New Terms take effect; acceptance required to keep using the appOura
- 17 Oct 2026Research cut-offCHI
Hardware brings customers in. Membership keeps the revenue.
Figures are from Oura’s September 2026 S-1 and S-1/A, for fiscal years ending 30 September. This is not investment advice.
The S-1 describes the model plainly: “Hardware sales are designed to offset customer acquisition costs at the point of purchase, while Oura Membership subscription extends lifetime value through predictable, recurring revenue.” Paid members grew from 1.3 million in September 2024 to 5.0 million in June 2026. The same filing records the warranty charge and the expectation that pricing and packaging may “evolve”.17,18
The connection. A free tier that about 94% of activating customers move past is not functioning as a meaningful alternative to membership. That is CHI’s interpretation of the figure, not a statement by Oura; the 85% retention rate on a service that cancels in one click is also a genuine signal of value. CHI reading
What is not established.
About conduct
- That Oura disables or bricks rings for non-payment; a lapsed ring keeps its three-score function.
- That Oura owns customers’ rings, or sells or misuses their health data.
- That Oura traps customers; cancellation is self-service.
- That Oura deliberately shortens battery life or practises planned obsolescence.
- That Oura concealed the Ring 4 battery issue; the finding is that no public consumer notice identifying affected rings was found.
- That Oura has raised its membership price in USD or EUR.
About the evidence
- That Gen3 non-members once had API, Apple Health or Health Connect access that was later removed; that history is not established.
- That second-hand reports of disabled rings are representative; they are press-relayed allegations.
- Any date for the end of Gen1 support, or for the six-to-one-month trial change.
- That any Oura feature is FDA-cleared; only Fertile Window is CE-marked, in the EU.
- That the auto-renewal claims in Lekhadia were proven; the case was dismissed untested.
- That any feature was removed from a ring’s original sold feature set; the only removal found is the web service.
Final CHI assessment · Partially Supports
You own the ring. Your data leaves it on Oura’s terms.
Oura is a well-run subscription business. Its membership price has not risen in five years, a 2021 ring still receives its newest features, the 2021 lifetime promise has been kept, Gen2 owners have never paid, and cancelling takes one link. This assessment credits all of that in full.
The finding is narrow. A Gen3, Ring 4 or Ring 5 owner who stops paying keeps the ring, three daily scores and a delayed batch export, and loses every live route for their data to reach Apple Health, Health Connect, Strava, Natural Cycles or their own software. Around that sit reserved control over what will require payment, a remote-disable capability whose cost can fall on second-hand buyers, no published post-warranty battery path, and an SEC-disclosed Ring 4 battery issue with no public consumer notice found.
Those structural asymmetries all operate after the customer has paid. The counterweights keep the conclusion at Partially Supports. No numerical CHI, CVI or CFS score has been assigned.
The ring is yours, and so is a copy of the data,
but only paying keeps it flowing.
Evidence behind this page.
- Oura Terms of Use, last updated 2 Oct 2026, effective 4 Nov 2026, §§II, IV, V, VII, VIII, XI, XIII, XVI, XIX, XXIII. ouraring.com Oura
- Oura support, “Oura Membership”, updated 16 Oct 2026. support.ouraring.com Oura
- Oura, Membership page, regional prices, read 17 Oct 2026. ouraring.com Oura
- Oura support, “Apple Health Integration”, updated 14 Oct 2026. support.ouraring.com Oura
- Oura support, “Health Connect by Android Integration”, updated 19 Aug 2026. support.ouraring.com Oura
- Oura support, “Strava Integration”, updated 14 Oct 2026. support.ouraring.com Oura
- Oura support, “Natural Cycles Integration”, updated 14 Oct 2026. support.ouraring.com Oura
- Oura support, “Partner Integrations”, updated 7 Oct 2026. support.ouraring.com Oura
- Oura support, “The Oura API”, updated 1 Oct 2026. support.ouraring.com Oura
- Oura API v2 documentation and OpenAPI specification 1.42, incl. troubleshooting and the December 2025 personal-access-token deprecation. cloud.ouraring.com Oura
- Oura support, “Export & Share Your Oura Data”, updated 14 Oct 2026 (9 Jul 2026 version also read). support.ouraring.com Oura
- Oura support, “Using Trends”, updated 14 Oct 2026. support.ouraring.com Oura
- Oura support, “Updates to the Oura Terms of Use”, updated 13 Oct 2026. support.ouraring.com Oura
- Oura support, “Disabled Oura Ring”, updated 7 Oct 2026. support.ouraring.com Oura
- Oura support, “Warranty FAQs”, updated 18 Aug 2026. support.ouraring.com Oura
- Oura support, “Set Up an Oura Ring”, section “Transfer Your Ring to a New User”, updated 7 Oct 2026; and “Factory Reset an Oura Product”. support.ouraring.com, support.ouraring.com Oura
- Oura Inc., Form S-1 registration statement, filed 3 Sep 2026. sec.gov SEC filing
- Oura Inc., Form S-1/A, 21 Sep 2026 (Paid Member definition, 28-day grace period, retention). sec.gov SEC filing
- Oura support, “Oura Ring Battery Tips”, updated 7 Oct 2026. support.ouraring.com Oura
- Oura support, “Oura Ring 4 Battery Life”, updated 21 Sep 2026. support.ouraring.com Oura
- Android Authority, reporting iFixit’s Oura Ring 5 teardown, 23 Jun 2026. androidauthority.com Press · teardown
- Oura blog, “Explore Oura on the Web”, 8 Feb 2024. ouraring.com Oura
- Gadgets & Wearables, “Oura users push back as web dashboard heads for shutdown”, 21 Jul 2026. gadgetsandwearables.com Press
- Business Wire, “ŌURA Health Launches Oura Ring Generation 3”, 26 Oct 2021. businesswire.com Oura
- Oura blog, “Welcome to Generation 3” (CEO post), 26 Oct 2021. ouraring.com Oura
- ŌURA on X, reply on lifetime membership and Ring 4, 4 Oct 2024 (text read via search index). x.com Oura
- Oura support, “Previous Oura Ring Generations”, updated 1 Oct 2026. support.ouraring.com Oura
- Oura support, “Oura Device Firmware Versions”, updated 5 Oct 2026. support.ouraring.com Oura
- Oura support, “Software Updates for iOS”, updated 13 Oct 2026. support.ouraring.com Oura
- Oura support, “Multi-Ring Support”, updated 7 Oct 2026. support.ouraring.com Oura
- Oura support, “Return & Exchange FAQs”, updated 7 Oct 2026. support.ouraring.com Oura
- Oura support, “Return or Exchange an Oura Product”, updated 14 Oct 2026. support.ouraring.com Oura
- Oura support, “Extend Protection Plan FAQs”, updated 14 Jul 2026. support.ouraring.com Oura
- Docket, Lekhadia et al. v. Oura Health Oy et al., N.D. Cal. No. 3:25-cv-10997. dockets.justia.com Court
- Complaint, Surber v. Oura Inc. et al., N.D. Cal. No. 3:26-cv-08686, 20 Aug 2026. clarksonlawfirm.com Court · allegation
- Business Wire, “ŌURA Debuts Stress Management Features”, 10 Oct 2023. businesswire.com Oura
- Business Wire, “ŌURA Announces Two New Heart Health Features”, 10 May 2024. businesswire.com Oura
- Oura Privacy Policy, 15 Jun 2026. ouraring.com Oura
- Oura blog, “Oura’s Ongoing Commitment to Health Data Privacy and Security”, 29 Aug 2025. ouraring.com Oura
- openFDA registration and listing, Oura Health Oy (no 510(k) clearance found); and Oura, Fertile Window User Manual (CE marking under EU MDR). api.fda.gov, support.ouraring.com Regulator · Oura
- Cybernews, “Why you shouldn’t buy a secondhand Oura ring”, 4 Sep 2026 (relaying user reports). cybernews.com Press · allegation
- Kracked, smart-ring subscription cost comparison, prices checked Sep 2026. kracked.com Press · comparison
- Fortune, “Oura’s plans to ensure consumers keep a ring on it”, 5 Mar 2025. fortune.com Press · interview
- Tom’s Guide, “Your Oura Ring just got new features”, 28 May 2026. tomsguide.com Press
- Oura support, “Lost Oura Products”. support.ouraring.com Oura
- Oura support, “Refer a Friend Program” (“we don’t currently offer a trade-in program”), updated 14 Oct 2026. support.ouraring.com Oura
- Oura store pages, Oura Ring 5 and Oura Ring 4, read 17 Oct 2026. ouraring.com, ouraring.com Oura
- Oura support, “Set Up the Oura App”, updated 1 Oct 2026. support.ouraring.com Oura
- Gadgets & Wearables, Oura Ring Gen3 launch coverage (non-member features), 26 Oct 2021. gadgetsandwearables.com Press
- Joel Latto, “Oura Ring Gen3 Upgrade Offer FAQ”, 27 Oct 2021, reproducing Oura’s launch FAQ on Gen2 updates. joellatto.com Press · reproduces Oura FAQ
Limits carried onto this page. CHI did not hold an Oura account, so the non-member app, export files and cancellation flow were not observed first-hand. The Internet Archive was unavailable, so earlier versions of Oura’s support pages could not be compared; for that reason, when the membership gate on the API and platform sync began, and whether Gen3 non-members ever had that access, are not established. Whether Oura has issued any notice to Ring 4 owners about the battery cohorts, the date Gen1 support ended, and the date the free period moved from six months to one are also not established. Second-hand disabled-ring reports are treated as allegations.
Status. Oura pages read up to 17 October 2026; research frozen the same day. The full research dossier is CHI’s controlling source for this page. No numerical CHI, CVI or CFS score has been assigned; scoring is reserved for a later calibration stage.
Reading this beside the rest of the index
Hardware you buy, and what the subscription decides it can still do.
Oura is assessed on what a ring owner keeps and can take with them after paying, not on whether wearables should carry subscriptions. WHOOP and Peloton are the closest comparisons.