Both GitLab CI/CD and GitHub Actions can build, test and deploy your application. Both are mature, widely adopted and actively developed. So why do teams keep asking which one to choose?
Because the right answer depends entirely on your situation — and most comparisons online either miss that nuance or were written by someone who hasn't run either in production under real load.
I've used both extensively. Here is an honest breakdown.
The fundamental difference
GitHub Actions is a CI/CD layer built on top of a code hosting platform. GitLab CI/CD is a CI/CD system that happens to come with code hosting included.
That distinction matters more than it sounds. GitLab was designed from the start as a complete DevOps platform — CI/CD, container registry, security scanning, dependency management, environments and deployments are all first-class citizens. GitHub Actions was added to an existing platform and, despite rapid development, still shows its origins as an add-on.
Pipeline syntax and configuration
GitLab CI/CD uses a single .gitlab-ci.yml file with a well-structured stage/job model. Jobs run within stages, stages run in sequence, jobs within a stage run in parallel by default. The mental model is clean and predictable.
GitHub Actions uses workflow files in .github/workflows/ with a trigger-based model. You define events (push, pull_request, schedule) and jobs that respond to them. The model is flexible — arguably more flexible than GitLab — but that flexibility can become complexity in larger pipelines.
For straightforward pipelines, both are equally approachable. For complex multi-project pipelines with dependencies between repositories, GitLab's native support for triggers and multi-project pipelines is significantly more mature.
Performance and runners
Both platforms offer hosted runners and the option to bring your own — self-hosted runners in GitHub, GitLab Runners in GitLab.
In practice, I've found GitLab's self-hosted runner setup more straightforward for production use — particularly the shell executor for teams that need direct access to the host environment without containerisation overhead.
GitHub Actions hosted runners have improved considerably and for standard workloads the performance is comparable. Where GitHub has an edge: the marketplace. If you need a pre-built action for a specific tool or service, it almost certainly exists. GitLab's equivalent (CI/CD components) is catching up but the ecosystem is smaller.
Security and compliance
This is where GitLab has a significant advantage for teams with compliance requirements.
GitLab includes built-in SAST, dependency scanning, container scanning, secret detection and licence compliance — all configurable within the pipeline without third-party integrations. For teams that need to demonstrate security controls to auditors, having these as native features rather than external integrations simplifies documentation considerably.
GitHub Actions can achieve the same results through marketplace actions (CodeQL, Trivy, Snyk etc.) but requires composing these from separate sources, which adds maintenance overhead and dependency on third-party action authors.
Self-hosting and data residency
If your organisation has data residency requirements — source code cannot leave your network — GitLab is the clear choice.
GitLab Community Edition is free, open source and can be self-hosted on your own infrastructure. You get the complete platform: code hosting, CI/CD, registry, everything. I've deployed self-hosted GitLab for clients with strict GDPR requirements and it works exactly as the hosted version.
GitHub has no self-hosted option for the platform itself. GitHub Enterprise Server exists but is expensive and still sends telemetry to GitHub. For organisations that need complete air-gap capability, this is disqualifying.
Pricing
For small teams using hosted runners:
GitHub Actions: free for public repos, 2,000 minutes/month free for private repos on Free plan.
GitLab: free tier includes 400 CI/CD minutes/month on hosted runners.
GitHub's free tier is more generous for hosted minutes. For teams that run frequent pipelines on hosted runners, this matters.
For teams running self-hosted runners, both are effectively free at the CI/CD level — you pay for your own infrastructure, not per minute. At scale, self-hosted runners are almost always more cost-effective.
When to choose GitLab CI/CD
You need a complete DevOps platform, not just CI/CD. Data residency or self-hosting is a requirement. Security scanning needs to be native and auditable. You run complex multi-project pipelines. Your team is starting fresh with no existing tooling.
When to choose GitHub Actions
Your code is already on GitHub and migration cost is high. You rely heavily on the open source ecosystem. You need marketplace integrations with dozens of third-party services. Your pipelines are straightforward and hosted minutes are sufficient.
The honest verdict
For greenfield projects, especially in regulated industries or with compliance requirements, I recommend GitLab. The integrated security tooling, self-hosting capability and mature multi-project pipeline support make it the more complete platform.
For teams already on GitHub with established workflows, the switching cost rarely justifies migration unless you hit specific limitations. GitHub Actions has matured significantly and handles the majority of CI/CD use cases well.
The worst outcome is paralysis over the choice. Both tools will serve you well. Pick the one that fits your existing infrastructure and invest the time you would have spent debating into actually optimising your pipeline.
Spending too long on slow or unreliable pipelines? Whether you're on GitLab or GitHub, I help engineering teams cut build times, embed security scanning and build pipelines that don't require babysitting. Typical engagement: 1–2 weeks, fixed scope, measurable results.
Get in touch → devops24.eu/#contact