head to head · open source
pi vs tau
pi has 106,704 GitHub stars, 13,453 forks, 202 open issues and last shipped today. tau has 5,137 stars, 210 forks, 9 open issues and last shipped 1 months ago. pi leads on adoption by 1,977% (106,704 vs 5,137 stars). pi is written in TypeScript under MIT; tau is written in Go under BSD-3-Clause. pi has attracted 13% as many forks as stars, tau 4%. pi was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| pi | tau | |
|---|---|---|
| GitHub stars | ★ 107K | ★ 5.1K |
| License | MIT | BSD-3-Clause |
| Written in | TypeScript | Go |
| Last push | 2026-09-18 | 2026-08-16 |
| Forks | ⑂ 13K | ⑂ 210 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick pi if
- You weight community size — 107K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick tau if
- You want the tau feature set and don't need the biggest community
- You prefer the BSD-3-Clause license terms
- Your stack matches Go
- You evaluated both and tau fits your workflow better
About pi
Pi is a modular agent toolkit written in TypeScript for building and running terminal based AI coding agents. It lives in the developer tooling ecosystem and provides composable packages for LLM integration, agent orchestration, and terminal UI rendering. The project centers on @earendil works/pi coding agent , an interactive CLI agent, supported by core runtime, AI abstraction, and TUI libraries.
About tau
Tau is a fullstack workspace for humans and machines, listed under Developer Tools / Build & Deployment. It is written in Go, licensed under BSD 3 Clause, and its topics place it in the cloud native developer tools ecosystem, including serverless, PaaS, distributed systems, WebAssembly, CDN, AI, 5G, P2P, and cloud computing. The README describes a development environment, an application build step, and a deploy and run step.
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Frequently asked questions
Is pi or tau more popular?
pi has 106,704 GitHub stars and tau has 5,137. pi has the larger community by that measure.
Are pi and tau free?
Both are open source. pi is licensed under MIT and tau under BSD-3-Clause. Neither carries a licence fee.
What is the difference between pi and tau?
pi is written in TypeScript and tau in Go. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, pi or tau?
Choose pi if you want the larger community (106,704 stars) or its MIT licence terms. Choose tau if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.