Buildkite Agent 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.
| Feature | Buildkite Agent | Concourse CI |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 83 · Excellent | 92 · Excellent |
| Category | CI/CD & Build | CI/CD & Build |
| License | MIT | Apache-2.0 |
| Language | Go | Go |
| Setup difficulty | Medium | Hard |
| Min. RAM | 256 MB | 2,048 MB |
| Deployment | docker, binary, bare-metal | docker, kubernetes, helm |
| GitHub stars | ★ 1,078 | ★ 7,906 |
| First released | 2014 | 2014 |
| Replaces | GitHub Actions, CircleCI | Jenkins, CircleCI |
What are Buildkite Agent and Concourse CI?
Buildkite Agent
The Buildkite Agent is an open-source build runner that executes pipeline jobs on your own machines while Buildkite coordinates orchestration. It lets teams keep build infrastructure private and scalable.
- Runs builds on your own hardware
- Cross-platform agent
- Parallel job execution
- Artifact handling
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
Buildkite Agent vs Concourse CI: key differences
Both projects are written in Go. Licensing differs — MIT for Buildkite Agent versus Apache-2.0 for Concourse CI. Buildkite Agent is the lighter option, starting around 256 MB of RAM against 2,048 MB for Concourse CI. Concourse CI has the considerably larger community, at 7,906 GitHub stars versus 1,078.
Why pick each one
Choose Buildkite Agent if…
- Released under the MIT license
- First-class Docker support for quick deployment
- Active community (1.1k GitHub stars)
- Written in Go
Choose Concourse CI if…
- Reproducible builds
- Strong isolation
Watch out for
- Steep learning curve
Frequently asked questions
Is Buildkite Agent or Concourse CI better?
Neither is universally better. Concourse CI has the larger community, while Buildkite Agent is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Buildkite Agent and Concourse CI free and open-source?
Yes. Buildkite Agent is licensed under MIT and Concourse CI under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Buildkite Agent and Concourse CI with Docker?
Buildkite Agent: yes. Concourse CI: yes.
Which is lighter on resources, Buildkite Agent or Concourse CI?
Buildkite Agent has the smaller minimum footprint at 256 MB of RAM, compared to about 2,048 MB for Concourse CI. Real-world usage depends on library size, user count, and enabled features.