Mystrix
MatrixOS
V3.2.0
Firmware

MatrixOS

Hype21/100

Matrix OS is a cross-platform operating system that mainly targets grid keyboard controllers.

MatrixOS is custom firmware for the 203 Systems Mystrix, by @203-Systems. Open source under MIT, latest release V3.2.0 (January 2026), 125 stars on GitHub.

for203 Systems Mystrix·by@203-Systems

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Download V3.2.0

MatrixOS-V3.2.0-Mystrix.uf2· 6.6 MB

MIT· 203-Systems/MatrixOS·matrix.203.io·downloads come from the creator’s GitHub releases

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Matrix OS Logo

An Open Operating System for Software Defined Controllers, Designed to be Flexible, Extensible, Multi-Modal, and Cross-Platform.

User Guide & Documentation

See Project Matrix Wiki

Supported Devices

Device NameTypeChipSupportedNoteLink
Mystrix & Mystrix ProGridESP32-S3Yes203.io
Mystrix Founder EditionGridSTM32F1NoRemoved in OS 3.0. Might reintroduce later203.io

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Acknowledgments

This project has been made possible with the following open-source projects:

FreeRTOS - Real Time OS Kernel

TinyUSB - USB Host/Device stack

MicroPython - Embedded Python runtime.

Printf - Formatted Printing Functions

CB0R - Zero-Footprint CBOR Decoder

ArduinoJson - Embedded JSON Decoder

Special thanks to LA104 for a lot of inspiration for this OS