A real time posture monitoring  Mac App: 1. Reminds you when you slouch; 2. Privacy centric: train your own posture model and none of your data leaves your computer; 3. All computing on local machine, use it even without internet; 4. Currently doesn't support external camera (coming soon); 5. Works great if the camera is in a fixed position: e.g.,  iMac

Free to download on  Mac AppStore, please let me know what you think.