Fitbit Open Source Android App

This app is based on the work of Jiska Classen, Matthias Hanreich, Steffen Kreis, Tobias Krichel, Johannes Riedel and Sven Ströher.

Features

• Scan for BLE Fitbit devices
• Authenticate against Fitbit server like the original app
• Obtain authentication credentials from the Fitbit server for authentication replay¹
• Get activity dumps¹ and decrypt them²
• Access live mode¹
• Dump memory including the complete firmware²
• Flash custom firmware³ that modifies step counts, reads out raw accelerometer data, etc.

Workflow

• Use official Fitbit app and associate a tracker you own physically with your user account.
• With a regularly associated tracker you can access all features that require authentication (live mode¹, memory readout²).
• Build any custom firmware using our Nexmon-based project https://github.com/seemoo-lab/fitness-firmware or use one of the pre-compiled images.

Models

1. all models including Ionic smart watch
2. probably Fitbit Flex, Charge, Charge HR, One with firmware < October 2017 only, ideally buy a new tracker and never update it
3. Fitbit Flex only