Are you looking for a cheap alternative to Travis CI or Circle CI? Then you are in luck! PeakFlow is a fast and cheap alternative to Travis CI and Cirlce CI.
PeakFlow is essentially free, since we offer 1 simultanious build for free for both private and public projects. Any additional build costs only 9.60$ which is very cheap compared to Travis CI and Circle CI with ~50$ per simultanious build.
Take a look at their pricing pages yourself here: