Oura
Oura Ring 4
$349
Released 2024-10
Best Fitness Trackers · head-to-head
Oura Ring 4 vs Ultrahuman Ring AIR
A sourced, side-by-side comparison. Oura Ring 4 is cheaper at $349. Every spec and price links to its source.
Ultrahuman
Ultrahuman Ring AIR
$349
Released 2023-09
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Oura Ring 4 | Ultrahuman Ring AIR |
|---|---|---|
| US price | $349 | $349 |
| Brand | Oura | Ultrahuman |
| Released | 2024-10 | 2023-09 |
| Form factor | ring | ring |
| Display | — | — |
| Battery days | 8 | 6 |
| Gps | No | No |
| Spo2 | Yes | Yes |
| Ecg | No | No |
| Subscription required | Yes | No |
| Water resistance (m) | 100 | 100 |
| Release | 2024 | 2023 |
Sources — Oura Ring 4: support.ouraring.com (verified 2026-06-15). Ultrahuman Ring AIR: androidcentral.com (verified 2026-06-15).
What's the difference between the Oura Ring 4 and Ultrahuman Ring AIR?
Where the two actually differ on the specs we track (2 of 8). Matching specs are omitted.
- Battery days: Oura Ring 4 8 vs Ultrahuman Ring AIR 6
- Subscription required: Oura Ring 4 true vs Ultrahuman Ring AIR false
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Oura Ring 4
Two whitelisted hands-on testers (TechRadar, Engadget) call the Oura Ring 4 the best smart ring, praising comfort, sleep tracking and the redesigned app. Both flag the mandatory $5.99/month subscription that paywalls essential features. In real-world use, TechRadar drained a Size 10 ring in about five and a half days of constant use with workouts, while Engadget regularly got seven days on the same size over two months of lighter use. (Numeric measured values were dropped because the digit forms did not literally appear in the source text; the battery claims survive within verbatim quotes.) (2 sourced reviews, 2 lab-tested.)
Praised: Best-in-class smart ring; comfortable, elegant titanium design; Highly accurate sleep tracking (near-polysomnography); Multi-day battery life in real use (roughly 5.5-7 days on a Size 10).
Flagged: Mandatory $5.99/month subscription paywalls essential features and hurts value; Automatic activity/workout detection is unreliable (false positives).
Ultrahuman Ring AIR
Two whitelisted testers (TechRadar, Tom's Guide) wore the Ring Air for a month and 60 days respectively, both benchmarking it against Apple Watch and Oura. Both praise its featherweight comfort, detailed data and no subscription; both flag easy scratching. Verdicts converge: a capable, data-heavy ring for enthusiasts. No RTINGS lab data exists. (2 sourced reviews, 2 lab-tested.)
Praised: Extremely lightweight (2.4-3.6g) and comfortable, even for sleep; Heart-rate/steps/sleep data tracks closely with Apple Watch and Oura references; No mandatory subscription to view your data.
Flagged: Scratches easily, especially the matte black finish, within weeks; Overwhelming volume of data; app less user-friendly than Oura; No screen means you must open the app for everything.