CI/CD tools compared
Summary: the CI/CD market has strongly consolidated. In 2026, GitHub Actions dominates by far, GitLab CI reigns among those who chose GitLab, and Jenkins survives in enterprise legacy. This lesson compares seven tools honestly — strengths, weaknesses, pricing — and distinguishes a category often confused: CI tools versus GitOps deployment tools.
1. Two families of tools that are often confused
Before comparing, a structuring distinction must be clarified.
Why this separation is gaining ground: giving your CI pipeline write access to your production cluster is a major security risk. With the GitOps model, the pipeline only writes to Git, and an operator inside the cluster pulls the changes. The pipeline never has any rights over production.
2. GitHub Actions — the dominant player
Important security advice: always pin third-party actions to a commit hash, not a tag. Write uses: actions/checkout@8f4b7f8... rather than @v4. A tag can be moved by the maintainer; a hash is immutable. Several security incidents in 2024 and 2025 exploited exactly this weakness.
3. GitLab CI — the complete integrated suite
GitLab's decisive argument in Europe: the ability to self-host the entire chain on your own servers, without any data leaving your infrastructure. For a ministry, a bank or a hospital subject to sovereignty constraints, it is often the only acceptable choice.
4. Jenkins — the veteran
Do not underestimate Jenkins for your career. If you are aiming for a position in a large established company — bank, insurance, industry, telecom — you will very likely encounter Jenkins. Knowing how to read a Jenkinsfile remains a marketable skill in 2026, even if you would never choose Jenkins for a new project.
5. The other players to know
6. Argo CD and Flux — the GitOps deployment layer
These tools do not replace your CI. They take over after the artifact is built.
The security benefit is worth repeating: in the GitOps model, the CI pipeline holds no credentials for production. It pushes a commit to Git, and that is all. This eliminates an entire class of risks — a compromised pipeline cannot reach your production.
The Premium GitOps course covers Argo CD and Flux in depth.
7. The summary comparison table
| Criterion | GitHub Actions | GitLab CI | Jenkins | CircleCI | Azure Pipelines |
|---|---|---|---|---|---|
| Year | 2019 | 2012 | 2005 | 2011 | 2018 |
| Hosting | SaaS (+ own runners) | SaaS or self-hosted | Self-hosted | SaaS | SaaS |
| Starting price | Free (public) | Free (400 min) | Free (software) | Limited free | Limited free |
| Learning curve | Gentle | Gentle | Steep | Gentle | Medium |
| Maintenance | None | Low to high | High | None | None |
| Extension ecosystem | The richest | Medium | The largest (1800+) | Medium | Medium |
| Full self-hosting | No | Yes | Yes | No | No |
| Windows / macOS support | Both | Windows | Both | Both | Excellent Windows |
| 2026 trend | Growing strongly | Stable and solid | In decline | In decline | Stable |
8. Which tool to choose — recommendation by context
The rule that sums it all up: choose the CI tool of the platform that already hosts your code. The gain from native integration — authentication, pull request statuses, permissions, logs — almost always outweighs the functional differences between the tools.
9. What has changed since 2015
The topic to watch in 2026: software supply chain security. The terms SLSA, SBOM, Sigstore and provenance appear more and more in senior DevOps job postings. A modern pipeline no longer just builds — it cryptographically proves what it built and from which sources.
Remember in 30 seconds
- Two families: CI engines (build, test) and GitOps operators (deploy). They complement each other.
- GitHub Actions dominates by far. Default choice if your code is on GitHub.
- GitLab CI is the most integrated, and the only one truly self-hostable end to end. Strong in Europe and the public sector.
- Jenkins is declining on new projects but omnipresent in enterprise legacy — knowing how to read it remains useful.
- Tekton and Argo Workflows are Kubernetes foundations, rarely used directly.
- Argo CD and Flux deploy in GitOps mode: the pipeline has no access to production.
- Simple rule: take the CI tool of the platform that hosts your code.
- Always pin third-party actions to a commit hash, never to a tag.