GitLab offers Free Trial, but diagrams.net does not.
GitLab is designed for Large Enterprises, Medium Business and Small Business.
diagrams.net is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of GitLab begins at $19/User/Month, while pricing details for diagrams.net are unavailable.
Some top alternatives to GitLab includes Codeship, Semaphore, CircleCI, Bamboo, AutoRABIT CI, Buildkite, CloudBees Core, Travis CI and Bitbucket.
Some top alternatives to diagrams.net includes Miro, FigJam, SmartDraw, Gliffy, Microsoft Visio, DrakonHub, Creately, Lucidchart, EDraw Max, DrawSQL, Quick Diagram and HackerDraw.