Since GitHub Actions CI/CD became generally available at the end of 2019, it’s dominated its competition.1 Determining CI provider market share turned out to be quite the rabbit hole. In 2017, GitHub published a chart showing Travis CI at 50% market share, and CircleCI in second at ~25%, and Jenkins in third. This one was weighted by the CI context info on commits, and the numbers sound pretty reasonable to me. A paper from 2022 that surveyed npm packages with GitHub repos found GitHub Actions at 51.7%, followed by Travis at 42.5% and CircleCI at 10.2%. A survey by JetBrains in 2023 shows Jenkins in the lead at 54%, with GitHub Actions and GitLab CI trailing closely at 51% each and CircleCI at 11% and Travis CI at 9%. The results from 2022 and 2023 reports differ significantly. I suspect the reason these numbers vary so wildly is because they’re using different denominators - one used npm-associated GitHub repos and the other surveyed individuals. ↩