Harness leads in popularity with 37,766 stars vs 24,531 stars for GitLab. The 54% higher star count indicates stronger community adoption. In terms of developer contributions, GitLab has 5,981 forks, indicating strong developer engagement.

Harness is growing faster, adding 492 stars in the last 30 days (+1.3%) against losing 42 stars for GitLab (-0.2%). Harness is both larger and pulling further ahead.

Both projects show recent activity, with GitLab last updated 2 hours ago and Harness 1 day ago.

Both tools share common technology foundations, being built with JavaScript, Bash, SCSS, Golang. However, they differ in their additional technology choices: GitLab uses CSS, Python, Vue, Ruby, Clojure while Harness leverages Typescript, JSX.

GitLab has been in development longer, starting 15 years ago, compared to Harness which began 13 years ago. This 2.4-year head start suggests GitLab may have more mature features and established processes.

GitLab uses the MIT license, which is more permissive than Harness's Apache-2.0 license, potentially offering greater flexibility for commercial use and integration.

Both tools serve similar use cases in CI/CD Platforms. However, they also have distinct specializations: GitLab also focuses on Project Management Suites, Git Platforms while Harness extends into PaaS & Deployment Tools.

Both GitLab and Harness offer self-hosting capabilities, giving you full control over your data and infrastructure.