If your code lives on GitHub, Actions is the path of least resistance. If you run a self-hosted or air-gapped environment, GitLab CI is purpose-built for that world. Both platforms deliver powerful CI/CD pipelines through YAML configuration, but they differ in philosophy, ecosystem, and operational model.

This guide breaks down the differences so you can pick the right tool for your team.

Feature Comparison

Feature	GitHub Actions	GitLab CI
Config location	.github/workflows/*.yml	.gitlab-ci.yml
Marketplace / reuse	20,000+ actions in Marketplace	CI/CD templates & components
Free tier (cloud)	2,000 min/month	400 min/month
Self-hosted runners	Yes	Yes (GitLab Runner)
Container registry	GitHub Packages (separate)	Built-in
Security scanning	Via third-party actions	Built-in SAST/DAST/dependency scanning
Pipeline visualization	Workflow graph	DAG & pipeline editor
Secrets management	Repository/org/environment secrets	CI/CD variables with masking & protection
Matrix builds	Native strategy.matrix	parallel:matrix keyword
Monorepo support	Path filters on triggers	rules:changes with path matching
Environments & approvals	Environment protection rules	Environment-based deployments with approvals
Artifact storage	90-day retention (configurable)	Configurable expiry per job

Configuration — YAML Side by Side

GitHub Actions stores workflows in .github/workflows/. Each file is an independent workflow triggered by events.

# .github/workflows/ci.yml
name: CI
on: [push, pull_request]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm ci
      - run: npm test

GitLab CI uses a single .gitlab-ci.yml at the repo root. Jobs are grouped into stages that run sequentially by default.

# .gitlab-ci.yml
stages:
  - build
  - test

install:
  stage: build
  image: node:20
  script:
    - npm ci

test:
  stage: test
  image: node:20
  script:
    - npm test

The key structural difference: GitHub Actions is event-driven with explicit triggers, while GitLab CI is stage-driven with implicit ordering. Both support conditional execution, caching, and artifact passing between jobs.

Runner Infrastructure

GitHub provides hosted runners on Ubuntu, Windows, and macOS. Larger runners (up to 64 cores) are available on paid plans. Self-hosted runners connect via a lightweight agent you install on your own hardware.

GitLab Runner is a single Go binary that supports multiple executors — shell, Docker, Kubernetes, and custom. You register runners at the instance, group, or project level. The Docker executor is particularly popular because each job runs in a fresh container, providing clean isolation without VM overhead.

Both platforms let you tag runners and route specific jobs to specific machines. GitLab’s executor model gives more flexibility for exotic environments (e.g., running jobs inside Kubernetes pods with auto-scaling).

Marketplace vs Templates

GitHub’s Marketplace hosts over 20,000 community-built actions. Need to deploy to AWS, publish a package, or send a Slack notification? There’s almost certainly an action for it. You reference actions by repository and version:

- uses: aws-actions/configure-aws-credentials@v4

GitLab takes a different approach with CI/CD templates and the newer Components catalog. Templates are included directly:

include:
  - template: Security/SAST.gitlab-ci.yml

GitLab’s built-in templates cover security scanning, container building, and deployment — features that require third-party actions on GitHub. The trade-off: GitHub’s marketplace is larger and more diverse, but GitLab’s templates are curated and officially maintained.

Self-Hosting

This is where GitLab shines. GitLab is available as a self-managed instance you can run entirely on-premises or in air-gapped networks. The entire platform — source control, CI/CD, registry, scanning — runs behind your firewall with zero external dependencies.

GitHub Enterprise Server offers self-hosting too, but it’s a more expensive proposition and the Actions ecosystem assumes internet connectivity for downloading actions. In restricted environments, you need to mirror actions internally or use actions/cache alternatives.

For regulated industries, government, or defense workloads where data cannot leave a private network, GitLab’s self-hosted story is significantly more mature.

When to Use GitHub Actions

• Your source code already lives on GitHub
• You want access to the largest ecosystem of reusable actions
• Your team ships open-source and wants community contributions to CI
• You need matrix builds across multiple OS and language versions
• You prefer event-driven workflows tied to GitHub features (issues, PRs, releases)

See our GitHub Actions cheat sheet for a quick-start reference.

When to Use GitLab CI

• You run a self-hosted GitLab instance or need air-gapped CI/CD
• You want security scanning (SAST, DAST, dependency, container) without third-party tools
• Your team values a single platform for code, CI, registry, and deployments
• You need advanced pipeline features like DAG execution, child/parent pipelines, or multi-project pipelines
• Compliance and audit trails are a hard requirement

Verdict

Both platforms are production-grade and battle-tested at scale. The decision usually comes down to where your code lives and how you operate:

• GitHub-native teams get the fastest setup and richest ecosystem with Actions.
• Self-hosted / security-first teams get more out of the box with GitLab CI.

If you’re starting fresh and don’t have a strong preference, GitHub Actions has a lower barrier to entry and a larger community. If you need an all-in-one DevSecOps platform you control end-to-end, GitLab is hard to beat.

FAQ

Is GitHub Actions better than GitLab CI?

GitHub Actions is easier to get started with and has a larger marketplace of reusable actions, making it the better choice for teams already on GitHub. GitLab CI offers more built-in features like security scanning, container registry, and a mature self-hosting story. The best choice depends on where your code lives and whether you need an all-in-one platform.

Is GitLab CI free?

Yes, GitLab CI is free on GitLab.com with 400 compute minutes per month on shared runners. The self-managed Community Edition is also free and includes full CI/CD functionality with no minute limits when using your own runners. Paid tiers (Premium and Ultimate) add features like advanced security scanning, compliance pipelines, and priority support.

Can I use GitHub Actions with GitLab?

Not directly — GitHub Actions is tightly integrated with GitHub and requires your repository to be hosted there. You could mirror a GitLab repository to GitHub and trigger Actions from the mirror, but this adds complexity and latency. In practice, it’s simpler to pick one platform’s CI/CD and commit to it.

Which is better for self-hosted runners?

GitLab has the stronger self-hosted story overall, since the entire GitLab platform (source control, CI/CD, registry, scanning) can run on-premises or in air-gapped environments. GitLab Runner’s multiple executor types (Docker, Kubernetes, shell) also provide more flexibility. GitHub Actions self-hosted runners work well but assume internet connectivity for downloading actions, which requires extra setup in restricted environments.

Either way, invest in understanding CI/CD fundamentals — the concepts transfer between platforms, and switching later is a configuration exercise, not a rewrite.