ThumbJam

ThumbJam is a powerful musical performance experience featuring over 40 high-quality, multi-sampled instruments and hundreds of scales. Jam in any style—from rock to classical—with expressive controls, built-in arpeggiator, and real-time effects like delay and reverb. The library includes a wide variety of instrument types, from strings and brass to keyboards and drums, all designed to feel and sound like real instruments.

For performers, ThumbJam offers extensive MIDI input/output, cross-app audio, and synchronization options (Ableton Link, CoreMIDI), plus loop building, multi-track export, and flexible scale support (including Scala imports). It supports polyphony, multiple simultaneous notes, and easy sharing of ideas across apps, making it a portable studio right in your browser.