# WHOOP 4.0 vs Ultrahuman Ring AIR: specs and price compared

A sourced, side-by-side comparison of the WHOOP 4.0 (WHOOP) and Ultrahuman Ring AIR (Ultrahuman) among fitness trackers.

## Side by side

| Spec | WHOOP 4.0 | Ultrahuman Ring AIR |
| --- | --- | --- |
| US price | not published | $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 |

## Key differences

- 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 Yes vs Ultrahuman Ring AIR No
- Water resistance (m): WHOOP 4.0 10 vs Ultrahuman Ring AIR 100

## What reviewers say

**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.)

## Sources

- WHOOP 4.0: https://www.dcrainmaker.com/2021/11/whoop-platform-review.html (dcrainmaker.com, verified 2026-06-15)
- Ultrahuman Ring AIR: https://www.androidcentral.com/wearables/ultrahuman-ring-air-review (androidcentral.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/fitness-trackers/whoop-4-0-vs-ultrahuman-ring-air/
Cite: Per The Front Desk Review, WHOOP 4.0 (not published) vs Ultrahuman Ring AIR ($349) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/fitness-trackers/whoop-4-0-vs-ultrahuman-ring-air/
License: CC BY 4.0.