Wearable API Tiers, Ranked (September 2026)
From S tier to F tier: which wearables make it easy to build with your data, and which lock it down.
This one ties directly into the launch of Athlete AI Labs.
When you build fitness apps, one of the foundational pieces is letting users connect ("OAuth in") with their wearables. That's how your app gets their data. And these companies range from super easy to completely restricted.
So here's a state of the union on the wearable API market.
The tiers
S Tier: Apple Health, Android Health Connect, WHOOP, Oura, Fitbit
A Tier: Intervals.icu
B Tier: COROS, Strava
C Tier: Wahoo, Suunto, Polar, Zepp/Amazfit
F Tier: Garmin, Zwift, TrainingPeaks
Start building
The complete guide shows you how to connect to every S and A tier platform.
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