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MothSynth is a tiny affordable Sampler / Synthesizer. Our mission is to build easy to use, opensource music making things that are fun to tinker with.


  • Compact credit card size
  • 16-key matrix keypad
  • ESP32-S3 processor, PCM5102A amp
  • 1-inch OLED display (OLED Model)
  • 3 Free IO Ports + GND + VCC
  • Battery Mod
  • 4 LEDs, Track / Pattern / BPM
  • 10 One Second Sample Banks
  • 24 1/3 Second Sample Banks
  • USB-powered, 3.5mm output
  • Open-source MothOS software
  • Config / Sample Upload App
BLACK FRIDAY SALE ON OLED MODELS!
Product 1

Classic no distractions version.

MothSynth Classic
$24.99 On Shopify!


Product 2
Product 3
Looking for the perfect holiday gift for the musically inclined friend, tech tinkerer, or even for yourself? MothSynth is the ideal compact, open-source synth and sampler that blends the world of music creation with hands-on electronics. Whether they love musical experimentation or enjoy working with Arduino or ESP32, MothSynth offers endless creative potential. It comes preloaded with MothOS, a versatile software that allows for 4-channel polyphony, real-time effects, and easy customization, empowering users to create awesome tracks and tweak every element.

With its credit card-sized form factor, customizable features, and a starting price of just $24.99, MothSynth is an affordable yet powerful tool for both music creation and hands-on Arduino/ESP32 programming. Give the gift of innovation and fun, whether for friends, family, or yourself this holiday season!

Companion App

Cheatsheet and Downloadable Instructions


DIY AA Battery Mod

Schematics and GitHub


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