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MothSynth is a tiny affordable Sampler / Synthesizer that comes preloaded with MothOS along with drum and instrument samples. Our mission is to build easy to use, opensource music making things that are fun to tinker with.


  • Compact size
  • 16-key matrix keypad
  • ESP32-S3 processor, PCM5102A amp
  • Midi-in, clock, note triggering
  • 1-inch OLED display
  • Available Battery Mod
  • 4 LEDs, Track / Pattern / BPM
  • 11 One Second Sample Banks
  • 12 1/3 Second Sample Banks
  • USB-powered, 3.5mm output
  • Open-source MothOS software
  • Config / Sample Upload App
Product 1
Product 2

Fully Assembled. AA Battery Mod. Supports midi-in clock and note triggering, but more features like note triggering are coming with future software updates!


MothSynth Midi-In LE + AA Mod

$43.99 On Shopify!


Every button executes four differrent functions from overdrive, to delay, to pitchbend


Live mode lets you record your song in real-time, quickly switch between instruments and effects


Tracker mode lets you plan ahead and edit your song in notesheet view


Midi-in lets you sync with your studio, midi clock and note triggering is supported with more features coming soon


MothSynth is an open-source, Arduino compatible sampler, tracker, and synthesizer that puts the power of live music creation at your fingertips. Each of the 16 buttons not only trigger notes but also execute four distinct functions such as delay, reverb, overdrive, envelope shaping and many more.

Powered by MothOS, a fully open-source firmware, MothSynth encourages musicians and Arduino enthusiasts to modify and customize it according to their needs. With MIDI-In clock sync for smooth integration into larger setups and more MIDI features coming soon, MothSynth is designed to expand with your creativity.

Our companion apps make it easy to upload samples and configure the device, giving musicians endless possibilities in a compact and affordable format.

Companion App

Cheatsheet and Downloadable Instructions


Schematics and GitHub


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