head to head · open source
Harness vs cuber-gem
Harness has 38,798 GitHub stars, 3,451 forks, 106 open issues and last shipped yesterday. cuber-gem has 711 stars, 27 forks, 7 open issues and last shipped 7 months ago. Harness leads on adoption by 5,357% (38,798 vs 711 stars). Harness is written in Go under Apache-2.0; cuber-gem is written in Ruby under Apache-2.0. Harness has attracted 9% as many forks as stars, cuber-gem 4%. Harness was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (continuous-delivery, docker), 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 | cuber-gem | |
|---|---|---|
| GitHub stars | ★ 39K | ★ 711 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Ruby |
| Last push | 2026-11-02 | 2026-04-12 |
| Forks | ⑂ 3.5K | ⑂ 27 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Harness if
- You weight community size — 39K 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 cuber-gem if
- You want the cuber-gem feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Ruby
- You evaluated both and cuber-gem fits your workflow better
About Harness
Harness Harness Open Source is an open source development platform packed with the power of code hosting, automated DevOps pipelines, hosted development environments (Gitspaces), and artifact registries. Overview Harness Open source is an open source development platform packed with the power of code hosting, automated DevOps pipelines, Gitspaces, and artifact registries. Running Harness locally The latest publicly released docker image can be found on harness/harness. To install Harness yourself, simply run the command below. Once the container is up, you can visit in your browser. The Harness image uses a…
read the full Harness overview →
About cuber-gem
CUBER Deploy your apps on Kubernetes easily. What is Cuber? Cuber is an automation tool (written in Ruby) that can package and deploy your apps (written in any language and framework) on Kubernetes. Unlike other tools that add more options and more complexity to Kubernetes, Cuber is made to simplify and reduce the complexity, thus making the deployment process more standardized and reliable. You just need to create a Cuberfile , with 10 lines of code, and then type cuber deploy to package and deploy your app on any Kubernetes cluster. Kubernetes is up to 80% cheaper compared to PaaS like Heroku and you can…
read the full cuber-gem overview →
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Frequently asked questions
Is Harness or cuber-gem more popular?
Harness has 38,798 GitHub stars and cuber-gem has 711. Harness has the larger community by that measure.
Are Harness and cuber-gem free?
Both are open source. Harness is licensed under Apache-2.0 and cuber-gem under Apache-2.0. Neither carries a licence fee.
What is the difference between Harness and cuber-gem?
Harness is written in Go and cuber-gem in Ruby. 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 cuber-gem?
Choose Harness if you want the larger community (38,798 stars) or its Apache-2.0 licence terms. Choose cuber-gem if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.