GitHub Actions vs GitLab CI: how to choose
GitHub Actions and GitLab CI both run pipelines defined in YAML in the repository, and both are good at it. The choice is rarely made on CI features alone — it is usually decided by where the code already lives and what else the platform provides.
The clearest structural difference is the ecosystem. Actions has a marketplace of reusable steps, which makes common tasks a one-line reference and introduces a supply-chain question: a third-party action runs with access to your workflow's secrets. GitLab leans on templates and container images, which is less convenient and has a smaller trust surface.
GitLab's advantage is integration breadth — issues, registry, security scanning, and environments in one product with one permission model. GitHub has closed much of that gap, but a self-managed GitLab remains the stronger option when everything must run inside your own infrastructure.
Frequently asked questions
Which is cheaper?
It depends entirely on where the minutes run. Both charge for hosted runners and both are free on self-hosted ones. For heavy pipelines, self-hosted runners on your own compute are dramatically cheaper than hosted minutes on either platform. Compare on your actual monthly minutes and concurrency needs rather than headline tiers.
How do the security models compare?
The main practical difference is third-party actions. A marketplace action runs inside your job with access to its secrets, so pinning to a commit SHA rather than a tag is essential — tags can be moved. GitLab's template model has less of this exposure by default. Both support OIDC for cloud authentication, which is the right way to avoid long-lived credentials in either.
Can I migrate pipelines between them?
The concepts map closely — jobs, stages, artifacts, caching, matrix builds — so the structure ports readily. What does not port is anything leaning on marketplace actions, since each needs a hand-written equivalent. A pipeline built mostly from shell steps in containers migrates in hours; one built from twenty marketplace actions takes considerably longer.
Which handles monorepos better?
GitLab has the edge, with rules and needs offering more expressive conditional execution and a directed acyclic graph for job dependencies. Actions can achieve the same with path filters and reusable workflows, but hits an awkward case where a skipped required check blocks merges, which needs a deliberate workaround in a monorepo.
Does self-hosting change the answer?
Substantially. GitLab has a mature self-managed story that has been the primary deployment model for years. GitHub Enterprise Server exists and works, but the hosted product gets features first. For an air-gapped or heavily regulated environment, self-managed GitLab is usually the lower-friction choice.
Further reading
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