MYTHOSIA
System Software Company

Precise,
down to the byte.

Mythosia is a system software company building tools for communication and embedded developers, along with .NET system libraries.

Explore CRMTContact us
SERIAL / UARTTCPSSH · SFTPHEXCRC16 · CRC32MODBUSNMEABLE DFUMCPC# SCRIPTING.NETAES · SEED
What we build

We work at the lowest layer, between devices and data

01

Developer tools

We build CRMT to monitor, analyze and automate serial communication — with MCP support so AI agents can work devices directly.

02

System libraries

We open-source .NET libraries for CRC and cryptography, and one API that spans multiple AI providers.

03

Compiler & language R&D

We research our own compiler and IDE for controlling embedded devices.

Flagship product
CRMT

CRMT

Communication Relation Monitoring Tool

A Windows tool for communication development: open serial ports, watch traffic as text and HEX side by side, and automate sending, responses and verification.

  • Multiple COM ports at once · text and HEX logged together
  • Automatic CRC/checksum, macro auto-responses
  • Hex Editor · Hex Diff · Encoder
  • AI control (MCP) for Claude Code and Codex
  • CoTrace live session sharing

Free · Windows 10/11 · x86 · x64 · ARM64

Learn moreMicrosoft Store
CRMT running (Korean UI shown)
CRMT running (Korean UI shown)
CRMT × AI

Let AI work your serial devices

Turn on CRMT's MCP server and Claude Code or Codex can find ports, connect, read and send data. Check a device with one plain-language request.

Watch the demo
Open source

.NET libraries, open source

What we needed while building products, packaged as libraries on NuGet and GitHub.

.NET · NuGet

Mythosia.AI

MIT

A modular .NET library to use OpenAI, Anthropic, Google, DeepSeek, Perplexity and more through one API — with document loaders, embeddings and retrieval for RAG.

$ dotnet add package Mythosia.AI
GitHub Docs
Company

Mythosia

Mythosia is a system software company that builds the tools communication and embedded developers need. Our goal is to help developers understand devices and data more precisely — and leave repetitive work behind.

Company
Mythosia Co., Ltd.
CEO
Junwoo Jung
Address
603-S23, 26-21, Dongtan-jungsimsangga 2-gil, Hwaseong-si, Gyeonggi-do, Korea
Email
support@mythosia.net

Questions about our products or a technical partnership?

Email us — we reply on weekdays, 09:00–18:00 KST.

support@mythosia.net