Hi Christian, We are very sorry about the app crash problem. We've rolled out a new version to fix this problem.  Please update your app through Google Play Store and let me know if that works for you.

What a fun interaction!

The differences between the two block-based programming options: • The Tinkergen software • only compatible with Bittle running on OpenCat 1.0 which is no longer updated • only support wired connection • it uses the C++ API and can generate C++ codes that students can study • Petoi Code Block - the new block-based programming support • compatible with OpenCat 2.0 and all Petoi robots • support wired and Bluetooth connections • it uses the Python API and can generate Python codes that students can study