| Device | Price (USD) | Subscription | Battery Life / Charge | Core Metrics | Data Export | Key Limitation | Fun Fact |
|---|---|---|---|---|---|---|---|
| Oura Ring Gen3 | 299 – 549 | Req. $5.99/mo | 4–7 d, wireless dock (~80 min) | HR, HRV, temp, sleep, readiness | CSV / API (members) | No display; sub cost | Worn by NBA “bubble” for COVID early-warning |
| Ultrahuman Ring Air | 349 | None | 4–6 d, dock (~3 h) | HR, HRV, temp, sleep, recovery, SpO₂ | Limited for now | New software; 1-yr warranty | ~2.4 g—market’s lightest; trade-in old Oura |
| Optim Ring | ~75 | None | ≤ 7 d, dock (~1.5 h) | HR, HRV, sleep, SpO₂, stress | None yet | Accuracy/support unproven | Cheapest smart-ring on market |
| WHOOP 5.0 Strap | “Free” w/ $199 / yr | Req. (device tied to sub) | 14 + d, slide-on pack | HR, HRV, sleep, strain, recovery, stress | CSV download | Pricey; no screen | Charge while wearing |
| Fitbit Charge / Sense | 100 – 300 | Premium $9.99/mo opt. | 5–7 d, magnetic cable | HR, HRV, sleep, SpO₂, ECG* | Web dashboard | Paywall for deep insights | Fitbit data used as court evidence |
| Apple Watch (S9 / Ultra) | 249 – 799 | None (Fitness+ opt.) | 1–2 d (Ultra 36 h), mag fast-charge | HR, ECG, SpO₂, temp, sleep, workouts | Full via Health app | Daily charging; iPhone-only | Outsold entire Swiss watch industry |
| Garmin (Fenix / Forerunner) | 200 – 1,000 + | None | 7–14 d+; solar options | HR, HRV, sleep, Body Battery, GPS | FIT/TCX files | Bulky; no ECG | Batteries last weeks; worn on ISS |
Created
August 4, 2025 16:50
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