I don't have a Mac, so I'm not sure how AirBending works, but here's a free open source one that works in the browser: https://gemini.google.com/share/e2ee937a688d

(Prompt: "Make an in browser midi theremin using Mediapipe")

There's a Web MIDI API, so might be able to reproduce all the functionality in a way that works across devices and operating systems.