DEPLOY

Buying guide

Oura Ring 4

By Oura · biometric

Price
$349-$499· actual sale price
Availability
Shipping now.
Maturity
commercial
Real-world use
Yes, 1 verified deployment

The Oura Ring 4 (Gen 4, late 2024, from Oura, founded 2013 in Oulu, Finland) is a titanium biometric smart ring and the study-first archetype of the biometric cohort. Its 'Smart Sensing' recessed sensors (PPG heart rate and HRV, red and infrared blood-oxygen, multi-point skin temperature, accelerometer) feed 50-plus metrics: sleep staging and Sleep Score, Readiness, Activity, stress, cycle tracking, a VO2 Max estimate, and an LLM 'Oura Advisor'. It is sold as a purchase (from about $349) plus a required Oura Membership ($5.99/month); the AI augments genuine biometric sensing rather than being the product. DEPLOY records commercial maturity and a reported $11 billion valuation (October 2025). The verified-vs-claimed throughline: Oura is positioned as general wellness and is not FDA-cleared for diagnostics, and it ran a blood-pressure study in December 2025 before marketing blood pressure, the study-first counterpoint to Whoop's market-first BP Insights. Oura is also the patent-holder in the smart-ring litigation (RingConn settled; Ultrahuman was ITC import-banned via the '178 patent).

Readiness

Oura Ring 4 is shipping now at $349-$499 or $70/year lease or $6/month subscription (actual sale price), the 4 capability claims on file are mixed autonomy with claimed, 1 verified deployment is on file, and no incidents are on record.

Availability
shipping-now

Shipping now.

see evidence →

Price honesty
actual-sale-price

3 prices on file: $349-$499 (actual sale price), $70/year lease (actual sale price), $6/month subscription (actual sale price).

see evidence →

Capability honesty
claimed-only

4 reviewed claims, mixed: 1 autonomous, 3 claimed-only.

see evidence →

Real-world use
commercial

Maturity: commercial. 1 verified deployment in the registry.

see evidence →

Safety record
no-incidents

No incidents on record. 1 verified deployment on file.

What it claims to do

Price

Real-world use

Safety record

No incidents on record. 1 verified deployment on file.

Privacy

Privacy practices disclosed by Oura for Oura Ring 4, with verification status.

  • Data retentionverified

    In 2021 Oura quietly expanded how it uses your data for research alongside the launch of its paid membership, and never directly notified existing users or asked them to agree again.

    Source: Oura Privacy Policy (current)

  • Biometric storageverified

    Oura stores menstrual cycle data, body temperature, and reproductive health signals. After the 2022 Dobbs ruling, this type of data became a documented legal risk in states with abortion restrictions. Data is stored in Finland under GDPR but is accessible to Oura and subject to US legal process.

    Source: Oura Cycle Insights feature page

  • Cloud uploadverified

    There is no opt-out from cloud sync. The app requires an internet connection and all your biometric readings upload to Oura's cloud. The ring buffers about six weeks of data locally as a backup, but there is no way to keep data on the ring or phone long-term.

    Source: Oura Support: How does Oura store my data?

  • Data saleverified

    Does not sell your health data and will not share it without your explicit consent.

    Source: https://ouraring.com/blog/privacy-is-our-priority/

  • Biometric storageverified

    Constantly tracks your heart rate, body temperature, and movement using built-in sensors.

    Source: https://support.ouraring.com/hc/en-us/articles/360025586673-How-Oura-Protects-Your-Data

  • Data deletion controlverified

    You can delete health data by date range directly in the app, covering Readiness, Sleep, Activity, Cycle Insights, Stress, Heart Health, and Metabolic data. Deletion is permanent.

    Source: https://support.ouraring.com/hc/en-us/articles/360025586673-How-Oura-Protects-Your-Data

  • Training data useverified

    Oura can use your sleep scores, activity, and body measurements to train its AI health features like the Oura Advisor. You choose whether to turn those AI features on.

    Source: https://conductatlas.com/platform/oura/oura-privacy-policy/

  • Location trackingverified

    Location is collected via GPS, WiFi, or network ID during activities only with your consent, for route, distance, speed, and pace tracking. Location data is never shared outside the Oura app without consent.

    Source: https://support.ouraring.com/hc/en-us/articles/42987798434963-Location-Services-for-Activities

  • Biometric storageverified

    Oura Ring collects heart rate, movement data, temperature data, respiration data, and calculates sleep phases including deep, light, REM, and awake, activity levels, readiness level, and body mass index; it also collects contact information, gender, height, weight, device information including IP address and location, and user-provided content such as activities, notes, photos, tags, and text submitted to AI assistants.

    Source: maker privacy policy · 2026-06-17

  • Data saleverified

    Oura does not sell or rent your personal information and does not sell or share your personal data for cross-context behavioral advertising; data is shared with service providers for platform hosting, data storage, customer services, marketing, and analytics; third-party integrations like Google Health Connect and Apple HealthKit only share data when the user chooses to integrate them; SMS opt-in consent data is not shared or sold with any third party or affiliate for marketing.

    Source: maker privacy policy · 2026-06-17

  • Data deletion controlverified

    Oura users can access their data via the app or Membership Hub, request deletion of their account by contacting dataprotection@ouraring.com, export their own data through the Membership Hub, correct and update basic information directly within the services, opt out of marketing by unsubscribing from emails or replying STOP to texts, withdraw consent at any time via the Membership Hub or settings, and disconnect third-party integrations.

    Source: maker privacy policy · 2026-06-17

  • Data retentionverified

    Oura deletes personal data when it is no longer needed for the purpose for which it was originally collected; measurement data including sleep, readiness, and activity is stored only as long as the Oura account is active; online services protect personal data in-transit using encryption and other security measures including anonymization or pseudonymization, strict access control, and regular security testing.

    Source: maker privacy policy · 2026-06-17

Specs

notes
  • FDA clearances (minimal - the disciplined posture): The Oura Ring 4 itself has NO FDA clearance; it is marketed as a GENERAL-WELLNESS product under FDA's general-wellness policy. Cleared-feature route is via PARTNER integrations (e.g. Natural Cycles, an FDA-cleared birth-control app, consuming Oura temperature data - the clearance belongs to Natural Cycles, not Oura).
  • Disciplined counter-case to Whoop (verified-vs-claimed): Oura launched a Blood Pressure Profile Study (Dec 2025) pursuing a hypertension feature, but it is INVESTIGATIONAL and NOT cleared - Oura is running the study/clearance path BEFORE marketing BP. This is the disciplined counter-case to Whoop's market-first posture (which drew an FDA warning letter for marketing uncleared BP).
  • CORRECTION (valuation): Valuation is $11B (Series E ~$900M, Oct 2025, Fidelity-led; revenue reportedly >$1B in 2025) - NOT the stale ~$5B+.
  • Verification posture: Boundary: biometric-primary + AI-augmented. Clinical posture: STRONGEST/growing on SLEEP (2025 Brigham & Women's study found Oura the most accurate consumer sleep tracker for 4-stage classification vs PSG; ~94% sleep/wake sensitivity vs PSG; 2026 meta-analysis corroborated). Posture is 'validated wellness', not 'cleared medical device' (except via partners). NOT verified: BP/hypertension feature (investigational); Readiness/VO2 Max accuracy (not clearance-validated).
specs
Oura Ring 4 (Gen 4, late 2024). Titanium smart ring; 'Smart Sensing' (recessed sensors, signal pathways 8->18); ~8-day battery. Sensors: PPG HR + HRV, red/IR blood-oxygen (SpO2 trends), multi-point skin temperature, accelerometer. Outputs: Sleep staging + Sleep Score, Readiness Score, Activity, stress, Cycle tracking + Natural Cycles integration, VO2 Max estimate, AI 'Oura Advisor' (LLM). 50+ metrics. Founded 2013, Oulu Finland. Purchase (~$349+) + REQUIRED Oura Membership ($5.99/mo).
battery
5-8 days
weight_kg
0.005
formFactor
biometric (biometric-primary smart ring + AI augmentation; sleep/readiness; general-wellness)
fda_clearance
{"source":"https://oura.com/temperature-trends","status":"none","details":"No FDA clearance as of 2026. CE mark Class IIa medical device in EU (2019). Positioned as wellness device in US market.","audited_at":"2026-06-07","source_name":"Oura","health_claim":"Sleep, readiness, activity tracking. Explicitly wellness-oriented in US; EU has medical device registration. No diagnostic claims in US.","verification_posture":"verified"}

What's under the hood

No brain on file for Oura Ring 4.

Frequently asked questions

Is the Oura Ring 4 actually available for purchase?
Yes, shipping now.Source: Oura raises ~$900M Series E at $11B valuation (Oct 2025; Fidelity-led)
What does the Oura Ring 4 cost?
Oura Ring 4 has 3 prices on file: $349-$499 one-time (actual sale price), $70/year lease (actual sale price), and $6/month subscription (actual sale price).Sources: Oura (Ring 4), Oura Ring annual membership $69.99/year (~$5.83/month effective); saves ~$2/month vs monthly plan. Required for advanced health metrics.
Does the Oura Ring 4 really tracks sleep?
Yes, verified. Oura Ring 4 performs this autonomously.Sources: Oura Ring research page listing 10+ peer-reviewed publications validating sleep staging accuracy vs. polysomnography (PSG) gold standard; multiple studies confirm 79-94% agreement for sleep/wake classification, Validation of Oura ring vs. PSG: 'Validity and inter-night reliability of the Oura ring for sleep quality estimation' -- Massot et al. Gait & Posture 2019; found high agreement for total sleep time and sleep efficiency
Does the Oura Ring 4 really tracks heart health?
Claimed by Oura; no verified demonstration on file.Source: Oura Ring heart rate monitoring explainer: PPG sensor measures resting heart rate, heart rate variability (HRV), average heart rate during the day and during sleep. Oura claims +/-2 bpm accuracy vs. ECG reference.
Does the Oura Ring 4 really tracks body temperature?
Claimed by Oura; no verified demonstration on file.Source: Oura Ring body temperature feature: measures nightly skin temperature variation (relative deviation from personal baseline, not absolute clinical temperature); used for illness early warning and menstrual cycle tracking; Oura claims temperature deviation can flag illness 1-2 days before symptoms appear.
Does the Oura Ring 4 really tracks menstrual cycle?
Claimed by Oura; no verified demonstration on file.Source: Oura Cycle Insights: uses temperature, HRV, resting HR, and activity to predict fertile window and period dates; FDA registered (Class II 510(k) exemption as cycle-tracking device); Oura claims ~79% accuracy for period prediction; NOT a contraceptive device per Oura disclaimers.
Where is the Oura Ring 4 being used?
Oura Ring 4 is in use at: Global operated by Oura.Source: Oura
Is the Oura Ring 4 safe?
No incidents on record across 1 verified deployment.
How does the Oura Ring 4 handle privacy?
Oura has disclosed 12 privacy practices for Oura Ring 4: data retention (In 2021 Oura quietly expanded how it uses your data for research alongside the launch of its paid membership, and never directly notified..), biometric storage (Oura stores menstrual cycle data, body temperature, and reproductive health signals. After the 2022 Dobbs ruling, this type of data becam..), cloud upload (There is no opt-out from cloud sync. The app requires an internet connection and all your biometric readings upload to Oura's cloud. The..), data sale (Does not sell your health data and will not share it without your explicit consent), biometric storage (Constantly tracks your heart rate, body temperature, and movement using built-in sensors), data deletion control (You can delete health data by date range directly in the app, covering Readiness, Sleep, Activity, Cycle Insights, Stress, Heart Health..), training data use (Oura can use your sleep scores, activity, and body measurements to train its AI health features like the Oura Advisor. You choose whether..), location tracking (Location is collected via GPS, WiFi, or network ID during activities only with your consent, for route, distance, speed, and pace trackin..), biometric storage (Oura Ring collects heart rate, movement data, temperature data, respiration data, and calculates sleep phases including deep, light, REM..), data sale (Oura does not sell or rent your personal information and does not sell or share your personal data for cross-context behavioral advertisi..), data deletion control (Oura users can access their data via the app or Membership Hub, request deletion of their account by contacting dataprotection@ouraring.c..), and data retention (Oura deletes personal data when it is no longer needed for the purpose for which it was originally collected; measurement data including..).Sources: Oura Privacy Policy (current), Oura Membership launch announcement, May 2021, Oura Cycle Insights feature page, EFF: Dobbs Decision and Your Digital Privacy, June 2022, Oura Support: How does Oura store my data?, https://ouraring.com/blog/privacy-is-our-priority/, https://support.ouraring.com/hc/en-us/articles/360025586673-How-Oura-Protects-Your-Data, https://conductatlas.com/platform/oura/oura-privacy-policy/, https://support.ouraring.com/hc/en-us/articles/42987798434963-Location-Services-for-Activities
Who makes the Oura Ring 4?
Oura Ring 4 is made by Oura, based in Oulu, Finland.Source: Oura raises ~$900M Series E at $11B valuation (Oct 2025; Fidelity-led)

Video

PRIMARY SOURCE
Courtesy of Oura

Oura's introduction of the Oura Ring 4. Oura is a wellness device; its sleep, readiness, and stress metrics are not FDA-cleared diagnostics.

PRIMARY SOURCE
Courtesy of ŌURA

Official Oura launch video for the Oura Ring 4, featuring Smart Sensing technology with up to 8 days of battery life, fully titanium design with recessed interior sensors, expanded size range, and six finishes.

Manufacturer

Oura (registry record: /companies/oura)

Compare side by side

Sources

  1. Oura raises ~$900M Series E at $11B valuation (Oct 2025; Fidelity-led) · https://www.cnbc.com/2025/10/14/oura-smart-ring-11-billion-valuation.html
  2. Oura Ring 4 (Gen 4, late 2024): Smart Sensing, signal pathways 8->18; sleep/readiness/temp; AI Advisor · https://ouraring.com/blog/oura-ring-4/
  3. Oura pursuing a hypertension feature via a Blood Pressure Profile Study (Dec 2025; investigational) · https://www.medtechdive.com/news/oura-blood-pressure-fda-study/
  4. Oura Ring sleep-staging validated PSG-comparable (Brigham & Women's study) · https://sleepreviewmag.com/sleep-diagnostics/consumer-sleep-tracking/oura-ring-4-sleep-accuracy/
  5. Oura Ring Gen3 + OSSA 2.0 sleep-staging validation vs ambulatory PSG (96 participants, 421,045 epochs; Sleep Medicine 2024; PMID 38382312) · https://pubmed.ncbi.nlm.nih.gov/38382312/
  6. Oura Ring 4 · https://support.ouraring.com/hc/en-us/articles/33045011508115-Oura-Ring-4
  7. Oura Ring research page listing 10+ peer-reviewed publications validating sleep staging accuracy vs. polysomnography (PSG) gold standard; multiple studies confirm 79-94% agreement for sleep/wake classification · https://ouraring.com/research
  8. Validation of Oura ring vs. PSG: 'Validity and inter-night reliability of the Oura ring for sleep quality estimation' -- Massot et al. Gait & Posture 2019; found high agreement for total sleep time and sleep efficiency · https://pubmed.ncbi.nlm.nih.gov/30280129/
  9. Oura Ring heart rate monitoring explainer: PPG sensor measures resting heart rate, heart rate variability (HRV), average heart rate during the day and during sleep. Oura claims +/-2 bpm accuracy vs. ECG reference. · https://ouraring.com/blog/oura-ring-heart-rate/ · 2023-06-01
  10. Oura Ring body temperature feature: measures nightly skin temperature variation (relative deviation from personal baseline, not absolute clinical temperature); used for illness early warning and menstrual cycle tracking; Oura claims temperature deviation can flag illness 1-2 days before symptoms appear. · https://ouraring.com/features/temperature
  11. Oura Cycle Insights: uses temperature, HRV, resting HR, and activity to predict fertile window and period dates; FDA registered (Class II 510(k) exemption as cycle-tracking device); Oura claims ~79% accuracy for period prediction; NOT a contraceptive device per Oura disclaimers. · https://ouraring.com/blog/oura-ring-cycle-insights/ · 2023-07-01
  12. Oura official YouTube (@oura_ring), embedded under standard YouTube embed terms. oEmbed author_url verified 2026-06-04. Maker product video. · https://www.youtube.com/watch?v=lCE7dmBojyg · 2026-06-04
  13. Oura (Ring 4) · https://ouraring.com/product/oura-ring-4 · 2024-10-01
  14. Oura Ring annual membership $69.99/year (~$5.83/month effective); saves ~$2/month vs monthly plan. Required for advanced health metrics. · https://ouraring.com/membership · 2024-09-30
  15. Oura · https://ouraring.com/
  16. Oura Privacy Policy (current) · https://ouraring.com/privacy-policy
  17. Oura Membership launch announcement, May 2021 · https://ouraring.com/blog/oura-membership/
  18. Oura Cycle Insights feature page · https://ouraring.com/cycle-insights
  19. EFF: Dobbs Decision and Your Digital Privacy, June 2022 · https://www.eff.org/deeplinks/2022/06/dobbs-decision-and-your-digital-privacy
  20. Oura Support: How does Oura store my data? · https://support.ouraring.com/hc/en-us/articles/360025589013
  21. https://ouraring.com/blog/privacy-is-our-priority/
  22. https://support.ouraring.com/hc/en-us/articles/360025586673-How-Oura-Protects-Your-Data
  23. https://conductatlas.com/platform/oura/oura-privacy-policy/
  24. https://support.ouraring.com/hc/en-us/articles/42987798434963-Location-Services-for-Activities

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