head to head · open source
Harness vs pybuilder
Harness has 38,384 GitHub stars, 3,398 forks, 106 open issues and last shipped yesterday. pybuilder has 2,045 stars, 276 forks, 103 open issues and last shipped 5 days ago. Harness leads on adoption by 1,777% (38,384 vs 2,045 stars). Harness is written in Go under Apache-2.0; pybuilder is written in Python under Apache-2.0. Harness has attracted 9% as many forks as stars, pybuilder 13%. Harness was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (build-automation), so they are genuine substitutes rather than adjacent tools.
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 | pybuilder | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 2.0K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-09-17 | 2026-09-13 |
| Forks | ⑂ 3.4K | ⑂ 276 |
| 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 pybuilder if
- You want the pybuilder feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and pybuilder 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 pybuilder
PyBuilder & x2014; an easy to use build automation tool for Python ========= PyBuilder is a software build tool written in 100% pure Python, mainly targeting Python applications. PyBuilder is based on the concept of dependency based programming, but it also comes with a powerful plugin mechanism, allowing the construction of build life cycles similar to those known from other famous (Java) build tools. PyBuilder is running on the following versions of Python 3.10, 3.11, 3.12, 3.13, 3.14, 3.15 and PyPy 3.10 and 3.11. See the GitHub Actions Workflow for version specific output. Installing PyBuilder is available usi…
read the full pybuilder overview →
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Frequently asked questions
Is Harness or pybuilder more popular?
Harness has 38,384 GitHub stars and pybuilder has 2,045. Harness has the larger community by that measure.
Are Harness and pybuilder free?
Both are open source. Harness is licensed under Apache-2.0 and pybuilder under Apache-2.0. Neither carries a licence fee.
What is the difference between Harness and pybuilder?
Harness is written in Go and pybuilder in Python. 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 pybuilder?
Choose Harness if you want the larger community (38,384 stars) or its Apache-2.0 licence terms. Choose pybuilder if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.