GitHub Actions vs GitLab CI vs CircleCI — UK CI/CD Comparison (2025)
GitHub Actions is the right default for all new UK projects: free for public repos, tightly integrated with GitHub (no context switching), the largest ecosystem of community actions, and GitHub-hosted runners satisfy Cyber Essentials patching requirements. GitLab CI is right when self-hosted GitLab is already the source control platform. CircleCI is declining — GitHub Actions has overtaken it on developer experience and cost for most UK teams. CI/CD platform choice affects UK security compliance (Cyber Essentials patching), audit trail quality (FCA/NHS), and cost. Here is an honest UK comparison.
| Factor | GitHub Actions | GitLab CI | CircleCI |
|---|---|---|---|
| Cyber Essentials (managed runners) | ✅ GitHub-hosted runners — patched by GitHub | ✅ GitLab.com runners — patched by GitLab | ✅ CircleCI cloud — managed |
| UK GDPR audit trail | ✅ GitHub Actions logs — immutable, 90-day retention | ✅ GitLab CI logs — configurable retention | Good |
| NHS/FCA change management evidence | ✅ Pull request + Actions run = complete audit trail | ✅ GitLab MR + pipeline = audit trail | Good — but less integrated |
| Ecosystem (community actions) | ✅ Largest — GitHub Marketplace | Growing | Smaller |
| Free tier | ✅ Free for public repos, 2000 min/month private | Free for public, 400 min/month private CI | Free tier limited |
| Self-hosted runners | ✅ Self-hosted runners on AWS eu-west-2 | ✅ GitLab runners, self-hosted | ✅ Self-hosted |
| Integration with source control | ✅ Native — same platform as code | Native (GitLab) | Requires OAuth integration with GitHub/GitLab |
| YAML syntax | ✅ Intuitive — on-push/on-PR triggers | Similar — more options, more complexity | Separate config syntax |
| ClickMasters standard | ✅ All new projects | GitLab-primary teams only | Not recommended for new projects |
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