First-generation product — no historical cycle data to predict a successor
Full details →| Fitbit Air | Polar Vantage V | |
|---|---|---|
| Pricing | ||
| Starting price | $99★ | $599 |
| Subscription | ℹ️ Optional — $99/yr | ✓ None |
| Hardware | ||
| Weight | 12g★ | 39g |
| Water resistance | 50m | 5ATM |
| Battery | 7 days | 8 days★ |
| Always-on display | ❌ | ✅★ |
| GPS | ❌ | ✅★ |
| Cellular | ❌ | ❌ |
| Platform | iOS & Android | iOS & Android |
| Tier | Fitness Tracker | Sports GPS |
| Buy timing | ||
| Released | May 7, 2026 | Oct 4, 2023 |
| Cycle advice | good★ | bad |
| Deals advice | good | good |
| Next model | — | Polar Vantage V4 (2026) |
Unlike WHOOP, there is no mandatory membership — pay $99 once and use Fitbit Air with the free Google Health app. Google Health Premium ($9.99/month) is optional.
Continuous heart rate, SpO2, HRV, and skin temperature tracking plus background FDA-certified AFib detection, in a 12g pebble designed to be worn and forgotten.
A week between charges, with a 5-minute top-up delivering a full day of use — significantly less downtime than WHOOP's slide-on charging system.
Polar Vantage V3 is one of the few sports GPS watches with on-demand ECG — usually only found on lifestyle smartwatches.
Running power measurement without a foot pod or chest strap — a significant training metric for pacing effort on hills and varied terrain.
The most detailed training load analysis in any sports watch: muscle groups targeted per session, recovery status per muscle, and long-term load trends.
The right pick depends on what you optimize for.
$396 vs $599 over 3 years · no required subscription.
8 days vs 7 days battery.
6 sensors.
12g · no required subscription.
Health-focused users who want passive, 24/7 biometric tracking without a screen on their wrist. Particularly strong for those drawn to WHOOP but put off by the subscription model — the Fitbit Air delivers comparable core health data for $99 outright. Works with both iOS and Android.
Full details →Serious endurance athletes — particularly runners and triathletes — who want Polar's unmatched training load science and recovery guidance, combined with ECG health monitoring and running power in a premium package.
Full details →