Semaphore is a simple-to-use, reliable, and blazing fast hosted continuous integration and delivery solution. Integrated with GitHub and BitBucket, with a set of 100+ preinstalled languages and tools, it runs your tests 59% faster than the closest competitor. It's free for open source projects and 100 private builds per month. Semaphore includes native Docker support with image caching, an intuitive UI that gets out of your way, and an option of automatic parallelization for Rails. With Semaphore, you test and deploy at the push of a button.