Tach – Visualize and untangle your Python codebase

In plain words

Tach is an open-source Python development tool that visualizes and analyzes codebase architecture to help teams organize growing projects. It identifies dependency tangles and provides tools to incrementally adopt modular monolith patterns, giving teams microservices-like organizational benefits without deployment complexity. Built in Rust for speed, Tach is free and used by teams at companies including NVIDIA and PostHog.

written from the facts on this page · September 2026

From the sources

A Python tool to visualize + enforce dependencies, using modular architecture 🌎 Open source 🐍 Installable via pip 🔧 Able to be adopted incrementally - ⚡ Implemented with no runtime impact ♾️ Interoperable with your existing systems 🦀 Written in rust - tach-org/tach

In the maker’s words, at launch

Hey everyone! We're Evan and Caelean, the authors of Tach. Tach lets you visualize the architecture of your Python codebase, and gives you the tools to incrementally improve it. It uses module boundaries to give teams the benefits of microservices without the deployment complexity. If your code has been getting…

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  Tach2025 · github.com · ▲140

  Untangle + visualize your codebase

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  Strict interfaces and dep management for Python, written in Rust2024 · github.com · ▲68

  Tach is a pip package that lets you define module boundaries, automatically detect all cross-module dependencies, and then validate and enforce those dependencies. It also supports strict interfaces for modules by overloading `__all__`. The core static analysis is done in Rust, so all Tach commands run quickly. The goal of Tach is to help eng teams maintain velocity while scaling quickly, something we've seen break down a number of times. Give it a try!

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