Fitbit

About Fitbit

Fitbit SDK provides tools for building applications and clock faces for Fitbit OS using JavaScript, CSS, and SVG, along with Web APIs that give developers access to data from Fitbit's active user base. Development is supported through Fitbit Studio, with documentation covering getting started guides, build references, and tutorials.

Completed apps and clock faces are distributed through an App Gallery, which requires developer registration and adherence to published guidelines. Support resources include a developer blog, community forum, and app manager tools for gallery submissions.

The legacy Fitbit Web API is being deprecated in September 2026, with functionality moving to a new infrastructure documented on the Google Health API developer site. Existing applications require migration to maintain uninterrupted data access, with guides provided for this transition. This platform is intended for developers building fitness and wearable-integrated applications.

Key features

• Build Fitbit OS apps and clock faces using JavaScript, CSS, and SVG
• Access Fitbit Web API data from over 20 million active Fitbit users
• Fitbit Studio development environment for building on Fitbit OS
• Distribute apps through the App Gallery
• App Gallery App Manager for managing published apps

Frequently asked questions