We're making a competitor: https://circleci.com/?join=hn. We're a lot like semaphore, except our tests run much faster, we do automatic parallelization, and we support python, node, clojure and PHP.
Looks good. I guess they beat Travis CI to the punch for testing private projects and taking payment for it. But it's Ruby only, at least right now. Maybe someday Github will just build this in with their 100 million.
They may do that - however running tests on every single push is not exactly resource free, and I have a hard time believing Github will offer it for free. And Semaphore's integration/UI seems pretty seamless already.
On a side note - I know some of the guys behind this - solid team that will go above and beyond to make you a happy customer if you sign up. I believe this alone could be a significant competitive advantage.
Semaphore definitively saves time and release a developer from a burden of setting up stuff manually. I would recommend this to everyone. Keep on the good work!
We're in beta, but you can check it out here: https://circleci.com/?join=hn