WHOOP
WHOOP 4.0
—
Released 2021-10
Best Fitness Trackers · head-to-head
WHOOP 4.0 vs Ultrahuman Ring AIR
A sourced, side-by-side comparison. Ultrahuman Ring AIR 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 | WHOOP 4.0 | Ultrahuman Ring AIR |
|---|---|---|
| US price | — | $349 |
| Brand | WHOOP | Ultrahuman |
| Released | 2021-10 | 2023-09 |
| Form factor | band | ring |
| Display | — | — |
| Battery days | 5 | 6 |
| Gps | No | No |
| Spo2 | Yes | Yes |
| Ecg | No | No |
| Subscription required | Yes | No |
| Water resistance (m) | 10 | 100 |
| Release | 2021 | 2023 |
Sources — WHOOP 4.0: dcrainmaker.com (verified 2026-06-15). Ultrahuman Ring AIR: androidcentral.com (verified 2026-06-15).
What's the difference between the WHOOP 4.0 and Ultrahuman Ring AIR?
Where the two actually differ on the specs we track (4 of 8). Matching specs are omitted.
- Form factor: WHOOP 4.0 band vs Ultrahuman Ring AIR ring
- Battery days: WHOOP 4.0 5 vs Ultrahuman Ring AIR 6
- Subscription required: WHOOP 4.0 true vs Ultrahuman Ring AIR false
- Water resistance (m): WHOOP 4.0 10 vs Ultrahuman Ring AIR 100
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
WHOOP 4.0
No sourced tester review yet.
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.