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Show HN: Tach – Visualize and untangle your Python codebase

Show HN: Tach – Visualize and untangle your Python codebase

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·February 25, 2025

Hey everyone! We're Evan and Caelean, and we're the authors of Tach.

Tach gives you the tools to build a modular monolith in Python: visibility into the state of your dependencies, as well as the tools to fix them.

Since our last Show HN (https://news.ycombinator.com/item?id=41359181) we've shipped support for layers, third party dependencies, visualizations, and more.

Tach is:

* Open source (MIT) and completely free * Fast (written in Rust ) * In use by teams at NVIDIA, PostHog, and more

As your team and codebase grows, code gets tangled up. This hurts developer velocity, and increases cognitive load for engineers.

One way Tach differs from existing systems that handle this problem (build systems, import linters, etc) is in it's ability to be incrementally adopted and its runtime speed.

If you struggle with dependencies, onboarding new engineers, or a massive codebase, Tach is for you! We built it with developers in mind - with clean integrations into Git, CI/CD, and IDEs, and the performance for it to be effective in any form factor.

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