Semaphore is described as 'The fastest CI/CD solution available on the market. Easily automate the process of software testing in the cloud. Make CI results part of your pull request review process, then watch how your team ships working code faster' and is a CI/CD system in the development category. There are more than 25 alternatives to Semaphore for a variety of platforms, including Web-based, Self-Hosted, Linux, SaaS and Mac apps. The best Semaphore alternative is GitLab, which is both free and Open Source. Other great apps like Semaphore are Jenkins, Protégé, Agola and BuildNinja.