CircleCI is described as 'Provides development teams the confidence to build, test, and deploy—quickly and consistently—across numerous platforms. Built to address the demanding needs of today's application development environments, CircleCI supports every component of a modern application' and is an website in the development category. There are more than 25 alternatives to CircleCI, not only websites but also apps for a variety of platforms, including Linux, Self-Hosted, SaaS and Windows apps. The best CircleCI alternative is Jenkins, which is both free and Open Source. Other great sites and apps similar to CircleCI are Travis CI, GitHub Actions, TeamCity and Azure Pipelines.