GitLab

GitLab is a comprehensive DevSecOps platform that ships the entire software development lifecycle — source control, CI/CD, security scanning, package registry, monitoring, and project management — as a single application. Unlike GitHub, which assembles its platform from integrated services, GitLab is a single Ruby on Rails monolith that can be self-hosted on-premise or used as GitLab.com SaaS. GitLab's defining architectural characteristic is its deeply integrated CI/CD pipeline system, which was purpose-built from day one rather than bolted on later. GitLab CI uses a simple `.gitlab-ci.yml` format with native support for DAG (directed acyclic graph) pipeline dependencies, enabling complex multi-stage builds that run in optimal parallel order. GitLab Runners can be deployed on Kubernetes, Docker, or bare metal. For enterprises with strict data residency or air-gap requirements, GitLab Self-Managed is a first-class deployment path — the same feature set as GitLab.com but running entirely within your own infrastructure. GitLab Ultimate includes DAST, SAST, container scanning, dependency scanning, license compliance, and secret detection out of the box.