Oura
Oura Ring 4
$349
Released 2024-10
Best Fitness Trackers · head-to-head
Oura Ring 4 vs WHOOP 4.0
A sourced, side-by-side comparison. Oura Ring 4 is cheaper at $349. Every spec and price links to its source.
WHOOP
WHOOP 4.0
—
Released 2021-10
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Oura Ring 4 | WHOOP 4.0 |
|---|---|---|
| US price | $349 | — |
| Brand | Oura | WHOOP |
| Released | 2024-10 | 2021-10 |
| Form factor | ring | band |
| Display | — | — |
| Battery days | 8 | 5 |
| Gps | No | No |
| Spo2 | Yes | Yes |
| Ecg | No | No |
| Subscription required | Yes | Yes |
| Water resistance (m) | 100 | 10 |
| Release | 2024 | 2021 |
Sources — Oura Ring 4: support.ouraring.com (verified 2026-06-15). WHOOP 4.0: dcrainmaker.com (verified 2026-06-15).
What's the difference between the Oura Ring 4 and WHOOP 4.0?
Where the two actually differ on the specs we track (3 of 8). Matching specs are omitted.
- Form factor: Oura Ring 4 ring vs WHOOP 4.0 band
- Battery days: Oura Ring 4 8 vs WHOOP 4.0 5
- Water resistance (m): Oura Ring 4 100 vs WHOOP 4.0 10
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).
WHOOP 4.0
Across 3 testing outlets, the Whoop 4.0 earns a consistently positive verdict, with GearJunkie scoring it 8.0/10. Reviewers converge on its accuracy for sleep, strain, and recovery tracking and its tangible impact on users' daily habits, while the recurring subscription cost (up to $30/month, or $239/year) is the main friction point raised. Battery life is reported consistently at around 4 to 5 days across sources. (3 sourced reviews, 3 lab-tested.)
Praised: Accurate sleep, recovery, and strain tracking (validated against gold-standard measures in one study, corroborated by consistency checks and accurate strain/recovery predictions); Meaningful, positive impact on users' lifestyle and habits; Consistent readings when compared against other wearables.
Flagged: Ongoing subscription cost is a sticking point for some users/reviewers.