Buildbot vs Concourse CI
A side-by-side comparison of two self-hosted ci/cd & build options — licensing, setup difficulty, resource needs, and what each one replaces.
Buildbot
Flexible Python-based continuous integration framework
VS
Concourse CI
Pipeline-based continuous thing-doer
| Feature | Buildbot | Concourse CI |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 78 · Good | 92 · Excellent |
| Category | CI/CD & Build | CI/CD & Build |
| License | GPL-2.0 | Apache-2.0 |
| Language | Python | Go |
| Setup difficulty | Hard | Hard |
| Min. RAM | 1,024 MB | 2,048 MB |
| Deployment | docker, source | docker, kubernetes, helm |
| GitHub stars | ★ 5,473 | ★ 7,906 |
| First released | 2003 | 2014 |
| Replaces | Jenkins | Jenkins, CircleCI |
What are Buildbot and Concourse CI?
Buildbot
Buildbot is an open-source continuous integration framework that automates the compile and test cycle. Configured entirely in Python, it scales from small projects to large distributed self-hosted build farms.
- Python-based config
- Distributed build workers
- Highly customizable
- Web dashboard
Concourse CI
Concourse is an open-source CI/CD system built around the principles of declarative pipelines and reproducible builds. Every task runs in an isolated container for consistent, debuggable builds.
- Declarative YAML pipelines
- Container-isolated tasks
- Visual pipeline graph
- Resource-based design
Buildbot vs Concourse CI: key differences
Buildbot is written in Python, while Concourse CI is built with Go. Licensing differs — GPL-2.0 for Buildbot versus Apache-2.0 for Concourse CI. Buildbot is the lighter option, starting around 1,024 MB of RAM against 2,048 MB for Concourse CI. Buildbot is the more established project (first released 2003), while Concourse CI arrived in 2014.
Why pick each one
Choose Buildbot if…
- Released under the GPL-2.0 license
- First-class Docker support for quick deployment
- Mature project with 5.5k GitHub stars
- Written in Python
Choose Concourse CI if…
- Reproducible builds
- Strong isolation
Watch out for
- Steep learning curve
Frequently asked questions
Is Buildbot or Concourse CI better?
Neither is universally better. Concourse CI has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Buildbot and Concourse CI free and open-source?
Yes. Buildbot is licensed under GPL-2.0 and Concourse CI under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Buildbot and Concourse CI with Docker?
Buildbot: yes. Concourse CI: yes.
Which is lighter on resources, Buildbot or Concourse CI?
Buildbot has the smaller minimum footprint at 1,024 MB of RAM, compared to about 2,048 MB for Concourse CI. Real-world usage depends on library size, user count, and enabled features.