head to head · open source
Harness vs tau
Harness has 38,378 GitHub stars, 3,397 forks, 106 open issues and last shipped 2 days ago. tau has 5,137 stars, 210 forks, 9 open issues and last shipped 1 months ago. Harness leads on adoption by 647% (38,378 vs 5,137 stars). Harness is written in Go under Apache-2.0; tau is written in Go under BSD-3-Clause. Harness has attracted 9% as many forks as stars, tau 4%. Harness 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
| Harness | tau | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 5.1K |
| License | Apache-2.0 | BSD-3-Clause |
| Written in | Go | Go |
| Last push | 2026-09-16 | 2026-08-16 |
| Forks | ⑂ 3.4K | ⑂ 210 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Harness if
- You weight community size — 38K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- 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 Harness
Harness Open Source is an Apache 2.0, Go based developer platform that combines Git source control management, CI/CD pipelines, Gitspaces hosted development environments and artifact registries into one self hostable system for engineering teams that want end to end software delivery without stitching four separate products together.
read the full Harness overview →
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 Harness or tau more popular?
Harness has 38,378 GitHub stars and tau has 5,137. Harness has the larger community by that measure.
Are Harness and tau free?
Both are open source. Harness is licensed under Apache-2.0 and tau under BSD-3-Clause. Neither carries a licence fee.
What is the difference between Harness and tau?
Harness is written in Go 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, Harness or tau?
Choose Harness if you want the larger community (38,378 stars) or its Apache-2.0 licence terms. Choose tau if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.