Braid - multi-camera acquisition and tracking software

Braid logo

Braid is free, open-source multi-camera acquisition and tracking software. It is useful for 3D tracking of animals, robots, or other moving objects. It operates with low latency and is suitable for closed-loop experimental systems such as virtual reality for freely moving animals.

Individual cameras are controlled with Strand Camera for low-latency 2D tracking without the use of markers and video recording to disk. Braid synchronizes multiple copies of Strand Camera and provides low-latency 3D tracking.

Braid is the successor of flydra, and is the result of a rewrite focused on performance, ease of use, and flexibility.


  • Hardware synchronized multiple camera acquisition using our open source hardware triggerbox
  • All per-camera features from Strand Camera
  • Realtime marker-free 3D tracking of multiple animals
  • Web based user interface allowing easy remote control
  • Integrated Python scripting



Releases are provided via GitHub.

Supported operating system

Ubuntu Linux (64 bit Intel/AMD) is supported. We test internally on macOS and Windows.


Braid is free and open source software.


Support is offered on a best effort basis via the github repository or the online forum. Contact Andrew Straw regarding for potential availability for collaboration or custom development.


Braid is developed partly via the BeeTracked project which is funded by the the VolkswagenStiftung. Further support comes from the University of Freiburg.