vs GitLab CI and CircleCI

Jenkins Versus GitLab CI and CircleCI

GitLab CI/CD 377 is built into GitLab 377 (GitHub Versus GitLab): one .gitlab-ci.yml per repository, jobs run by GitLab Runner on GitLab's machines or yours, and the same YAML on GitLab.com and a self-managed server. BookNest's test job would read:

.gitlab-ci.yml: BookNest's tests with a PostgreSQL service (not run here)YAML

test:
  image: node:24-alpine
  services:
    - name: postgres:18
      alias: db
  variables:
    POSTGRES_USER: booknest
    POSTGRES_PASSWORD: booknest
    POSTGRES_DB: booknest
    PGHOST: db
  script:
    - npm ci
    - npm test

CircleCI 10,326 is a hosted service with a .circleci/config.yml, reusable packages of configuration called orbs, and self-hosted runners for private networks. It bills in credits: the Free plan includes 30,000 a month, the Performance plan starts at $15 a month with $15 per extra 25,000 credits, and a Linux Medium machine uses 10 credits a minute, so about $0.006 a minute.

Jenkins 8,793 , GitLab CI/CD and CircleCI in September 2026
	Jenkins	GitLab CI/CD	CircleCI
Pipeline file	Jenkinsfile (Groovy)	.gitlab-ci.yml	.circleci/config.yml
License	MIT	Core MIT, paid tiers proprietary	Proprietary
Who runs it	You	GitLab, or you	CircleCI; runners optional
Price	Free; you pay for machines	Free tier; Premium $29 a user/month	Free tier; from $15/month
Extending it	2,000+ plugins, Groovy	Components, templates	Orbs

Choose GitLab when the code already lives there, CircleCI when you want hosted speed without GitHub 29 , and Jenkins when builds must stay on your own network, need unusual hardware, or depend on plugins the others lack. The cost of Jenkins is people: someone patches, backs up and upgrades the controller (Securing Jenkins-Backups and Upgrades).

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