Companion API Reference
Get detailed technical information about the Fitbit Companion APIs.
The Companion APIs are accessible by applications which run within the Fitbit mobile application only.
Modernizing the Fitbit Developer Experience.
The Fitbit Web APIs are moving to a new, scalable infrastructure. We
will be deprecating the legacy Fitbit Web API in September 2026. To
ensure uninterrupted data continuity for your users, you will need
to migrate your applications. Detailed migration guides are live
on the
Google Health API
developer site.