Other CI/CD Platforms at a Glance (GitLab CI, CircleCI, Jenkins)
GitHub Actions is one option among several, and the concepts transfer.
GitHub Actions is popular, but it is far from the only CI/CD platform. Knowing the landscape helps you understand trade-offs and makes you portable. This lesson tours three major alternatives: GitLab CI, CircleCI, and Jenkins, and the model each uses.
GitLab CI/CD
Built into GitLab, configured with a .gitlab-ci.yml of stages and jobs. Its strength is tight integration with the rest of the GitLab platform (repos, issues, registry, security scanning) in one tool. If your code already lives in GitLab, its CI is the natural, batteries-included choice.
CircleCI
A cloud-first CI/CD platform configured with .circleci/config.yml. It is known for fast, flexible builds, strong caching and parallelism, and reusable config packages called orbs. It integrates with multiple source hosts, so it is a common pick for teams that want a dedicated CI tool decoupled from where their code lives.
Jenkins
The long-standing, self-hosted, open-source automation server. You run and maintain it yourself, and a vast plugin ecosystem lets it do almost anything. That flexibility is also its cost: Jenkins demands real operational ownership. It remains common in large enterprises with bespoke, long-established pipelines.
Common ground
- All express pipelines as stages/jobs/steps, usually in a YAML file in the repo.
- All separate the pipeline definition from the runner/executor that runs it.
- All support caching, artifacts, secrets, and parallelism; the syntax differs, the concepts do not.
Key takeaways
- GitLab CI is batteries-included if your code lives in GitLab; CircleCI is a flexible dedicated CI tool.
- Jenkins is maximally flexible and self-hosted, at the cost of real operational ownership.
- The core concepts (stages, jobs, runners, caching, secrets) transfer across all platforms.