Compare up to three models from one category. Keep the purpose and the source beside the numbers.
A narrow sleep-tracking ring made in Japan
Keep in mind The slimness and battery figures still need independent testing. This is a long wait, with certification-dependent country support and specifications still subject to change. Sleep-apnea tendencies are not a verified diagnosis.
Sleep, recovery and daily activity trends
Keep in mind Native US and UK ring prices were not verified; membership prices for those regions were verified.
Published specifications and documented constraints. See the full comparison below for prices and sources.
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| Smart ringsAdd a model |  |  |
|---|---|---|
| Prices · all markets | Price not verified 0 offer records & sourcesNo verified price in this audit. | €265.30 EUR≈ $297 USDECB 2026-10-12EU · Store price · Listed 1 offer records & sources€265.30 EUR≈ $297 USDECB 2026-10-12 EU · Store price ListedSilver; ring size unselected; LT delivery Official LT/EUR store lists a discounted ring price of €265.30 (regular reference €379). Manufacturer metadata adds €15 LT shipping. Size-specific stock, expiry and final checkout total are unverified.Price source ↗ Checked 2026-10-12 |
| Designed for | A narrow sleep-tracking ring made in Japan ↗ | Sleep, recovery and daily activity trends ↗ |
| Tracking | Not verified | Sleep stages, heart rate, overnight HRV and SpO2, temperature trends, activity, stress and recovery insights ↗ |
| Sensors | Sleep stages, heart rate, HRV, SpO2, steps and stress ↗ | Green/infrared PPG, red/infrared blood-oxygen LEDs, digital temperature sensor and accelerometer ↗ |
| Battery / power | 7-10 days, up to 10 maximum (manufacturer claim) ↗ | Typically 5-8 days; about 20-80 minutes recharge ↗ |
| Battery context | Manufacturer maximum; size and settings can change actual runtime ↗ | Manufacturer estimate; ring size, features, battery age and use dependent ↗ |
| Water / dust rating | Not verified | 100 m; manufacturer excludes diving ↗ |
| Connection & compatibility | English companion app planned for Kickstarter units ↗ | Bluetooth LE; Oura app requires iOS 16+ or Android 11+ with Google Play services and phone Bluetooth 5.0 support ↗ |
| Material | Not verified | Titanium inner and outer surfaces; finish-dependent PVD or DLC coating ↗ |
| Fit & sizing | Not verified | Use Oura Ring 4 sizing kit; Ring 5 sizing kit differs ↗ |
| Weight | Not verified | 3.3-5.2 g depending on ring size ↗ |
| Subscription | No subscription ↗ | Membership for detailed insights: US $5.99/month or $69.99/year; EU €5.99/month or €69.99/year; UK £5.99/month or £69.99/year; first month free for eligible new members ↗ |
| Ring width | 5.19 mm (manufacturer claim) ↗ | Not verified |
| Thickness | Not verified | Not verified |
| Materials | Not verified | Not verified |
| Controls | Not verified | Not verified |
| Payments & haptics | Not verified | Not verified |
| Availability | Kickstarter funded and ended October 10, 2026; official site says limited late pledges are open. Delivery not yet claimed. May-July 2027. Current late-pledge reward price not exposed in accessible campaign text; do not reuse the ended $1 price-pass offer as a product price. | Official Ring 4 store and support pages remain available. A current EUR storefront offer was verified; US/UK ring prices could not be verified in this geo-specific session. |
| Important context |
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| Editorial pick & release | #1 · Upcoming Smart ringsExpected: May-July 2027SOXAI RING X backer delivery, certified destinations only | #4 · Our Top 10 Smart ringsReleased: Oct 15, 2024US retail availability directly reported by the retailer |
| Evidence | Manufacturer source Checked 2026-10-12 | Manufacturer source Checked 2026-10-12 |
Battery claims use different conditions and are not a controlled benchmark. “Not verified” is an evidence gap, not a missing feature. Prices are dated regional snapshots. Deposits, bundles and historical launch prices are labelled. Brightness measurement methods and battery workloads vary by manufacturer.
