I like Theremin apps, and this one looks lovely.

Play with light

Theremin I/O turns your iPhone into a touchless music instrument. It uses your camera and flash to measure the distance to your hand, this signal is then processed by a synthesizer to generate a tone.

Features

  • Old-school synthesizer
  • Constrain input to scales (harmony quantization)
  • 8 sound presets with effect controls
  • 50+ scale presets
  • Use as a MIDI controller (requires in-app purchase)
  • Learn fast with the tutorial overlay

It’s priced at $1.99. Introductory price during the first week!

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