First-generation product — no historical cycle data to predict a successor
Full details →| COROS Apex | Fitbit Air | |
|---|---|---|
| Pricing | ||
| Starting price | $429 | $99★ |
| Subscription | ✓ None | ℹ️ Optional — $99/yr |
| Hardware | ||
| Weight | 40g | 12g★ |
| Water resistance | 5ATM | 50m |
| Battery | 24 days★ | 7 days |
| Always-on display | ❌ | ❌ |
| GPS | ✅★ | ❌ |
| Cellular | ❌ | ❌ |
| Platform | iOS & Android | iOS & Android |
| Tier | Sports GPS | Fitness Tracker |
| Buy timing | ||
| Released | Oct 15, 2025 | May 7, 2026 |
| Cycle advice | good | good |
| Deals advice | neutral | good★ |
| Next model | — | — |
The 46mm Apex 4 delivers 65 hours of GPS tracking and 24 days typical use — enough for multi-day mountain events without charging. The 42mm offers 41h GPS and 15 days.
Global topographic maps with instant rendering, turn-by-turn navigation, POIs, and an underwater depth gauge — the Apex 4 is the first COROS mid-tier with a depth sensor.
Audio alerts, hands-free calling, and voice pin recording — a first for the Apex line, adding practical trail and daily-wear convenience to this mountain sports watch.
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.
The right pick depends on what you optimize for.
$396 vs $429 over 3 years · no required subscription.
24 days vs 7 days battery.
5 sensors.
12g · no required subscription.
Trail runners, ultramarathon athletes, and multisport competitors who want full offline maps and long GPS battery without paying Vertix 2S prices. The speaker and depth gauge make the Apex 4 more capable than any previous Apex for mixed adventure and triathlon use.
Full details →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 →