Support for the legacy Fitbit Web API ends on September 30, 2026

Important: Support for the legacy Fitbit Web API ends on September 30, 2026. After this date the API will continue to operate, but Google will no longer fix bugs or provide API support. On October 30, 2026, the Fitbit Web API will be turned off and will no longer function or sync data to or from Fitbit users. To continue accessing data for your users after this date, migrate to the Google Health API.

Cardio Fitness Score (VO2 Max)

The Cardio Fitness Score (also known as VO2 Max) endpoints are used for querying the maximum or optimum rate at which the user’s heart, lungs, and muscles can effectively use oxygen during exercise.

Developers can use the following API endpoints when integrating the VO2 Max data type:

Get VO2 Max Summary by Date returns single date summary data.
Get VO2 Max Summary by Interval returns interval summary data for a specified date range.

Breathing Rate

Devices