ToneTone

You can use presets or set your own configurations. Sound generation and manipulations are done in real-time. Everything is customizable, including frequency ranges, wave types, musical scale etc.

You can set constant steps between frequencies or use twelve-tone musical scale. Three octaves are available as preset. But you can play in any octave, configuring frequency ranges...

You can associate screen colors with frequencies of waves. Red for the lowest frequency and purple for the highest. Or black for the lowest, and white for the highest...

You can configure advanced settings to generate custom tones/sounds. You can share and import custom configs...

Let your hand sing!

Please note that latencies are device-spesific. Since everything is in real-time, latencies can be high on some devices. Also your device have to pass a one-time test to be able to run the app. Because some features are not implemented on some devices although they should be.

A short demonstration on youtube:
https://www.youtube.com/watch?v=TNwytvcQVSk