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.
Irregular Rhythm Notifications
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Irregular Rhythm Notifications

The Irregular Rhythm Notifications (also known as IRN) endpoints are used for querying the user's engagement with the IRN feature and the alerts received. The IRN API is for research use or investigational use only, and is not intended for clinical or diagnostic purposes.

Developers can use the following API endpoints when integrating the irregular rhythm notification data type: