Oura
Oura Ring 4
$349
Released 2024-10
Best Smart Rings · 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 2023-06
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 | 2023-06 |
| Material | Titanium (non-allergenic inner and outer surfaces) | Titanium outer shell with tungsten carbide carbon coating; medical-grade hypoallergenic inner layer |
| Weight (g) | 3.3-5.2 | 2.4-3.6 |
| Battery days | 8 | 6 |
| Spo2 | Yes | Yes |
| Temperature sensor | Yes | Yes |
| Ecg | No | No |
| Subscription required | Yes | No |
| Water resistance (m) | 100 | 100 |
Sources — Oura Ring 4: ouraring.com (verified 2026-06-15). Ultrahuman Ring AIR: ultrahuman.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 (4 of 8). Matching specs are omitted.
- Material: Oura Ring 4 Titanium (non-allergenic inner and outer surfaces) vs Ultrahuman Ring AIR Titanium outer shell with tungsten carbide carbon coating; medical-grade hypoallergenic inner layer
- Weight (g): Oura Ring 4 3.3-5.2 vs Ultrahuman Ring AIR 2.4-3.6
- 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
Four testers (Tom's Guide, TechRadar, Engadget, Digital Trends) all hands-on-tested the Oura Ring 4 and call it the best smart ring you can buy, praising the all-titanium comfort and companion app. Every source flags the mandatory ~$5.99/month subscription; easy scratching and step/calorie/activity-detection accuracy are the recurring doubts across reviews. (4 sourced reviews, 4 lab-tested.)
Praised: Comfortable all-titanium design with flush, recessed sensors; Excellent companion app with clear data presentation; Long real-world battery life (roughly 5.5-7 days per charge).
Flagged: Mandatory ~$5.99/month subscription to unlock most features; Step / calorie / activity-detection accuracy lags a smartwatch; Titanium surface scratches easily within weeks.
Ultrahuman Ring AIR
Two whitelisted testers (TechRadar, Digital Trends) each wore the Ring Air hands-on for a full month in August 2023 and agree it is exceptionally light, comfortable to wear 24/7, accurate against wrist wearables in side-by-side testing, and free of any subscription. Both also flag that it scratches within weeks of gym/daily wear and packs in a lot of data to comb through, though they split on how usable the app is. (2 sourced reviews, 2 lab-tested.)
Praised: Exceptionally light and comfortable to wear 24/7, including overnight; Health/sleep/heart-rate data tracks accurately vs wrist wearables in side-by-side testing; No monthly subscription fee, unlike Oura and Whoop.
Flagged: Titanium coating scratches within a few weeks of gym/daily wear; A lot of data to comb through; the app is data-dense; Expensive at $349.