head to head · open source
Harness vs penguin-harness
Harness has 38,398 GitHub stars, 3,402 forks, 106 open issues and last shipped 3 days ago. penguin-harness has 2,305 stars, 245 forks, 77 open issues and last shipped yesterday. Harness leads on adoption by 1,566% (38,398 vs 2,305 stars). Harness is written in Go under Apache-2.0; penguin-harness is written in TypeScript under Apache-2.0. Harness has attracted 9% as many forks as stars, penguin-harness 11%. penguin-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.
← all 20902 open source comparisons
Side by side
| Harness | penguin-harness | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 2.3K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | TypeScript |
| Last push | 2026-09-18 | 2026-09-20 |
| Forks | ⑂ 3.4K | ⑂ 245 |
| 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 penguin-harness if
- You want the penguin-harness feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and penguin-harness 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 penguin-harness
PenguinHarness is an open source, local first, multi agent auto development platform that runs on a developer's own computer or server and automates the full lifecycle of AI agent applications — creation, evaluation, optimization, and deployment — under the Apache 2.0 licence.
read the full penguin-harness overview →
More in Developer Tools
Related comparisons
More Build & Deployment projects
Compare either of these against the rest of the Build & Deployment field.
Frequently asked questions
Is Harness or penguin-harness more popular?
Harness has 38,398 GitHub stars and penguin-harness has 2,305. Harness has the larger community by that measure.
Are Harness and penguin-harness free?
Both are open source. Harness is licensed under Apache-2.0 and penguin-harness under Apache-2.0. Neither carries a licence fee.
What is the difference between Harness and penguin-harness?
Harness is written in Go and penguin-harness in TypeScript. 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 penguin-harness?
Choose Harness if you want the larger community (38,398 stars) or its Apache-2.0 licence terms. Choose penguin-harness if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.