Codeship vs Shippable

Codeship is a free hosted Continuous Delivery Service that integrates with GitHub and Bitbucket. A simple push to your repository runs your automated tests and configured deployments on our powerful machines. From a simple deployment to Heroku to complex Deployment Pipelines for your large infrastructure, all can be set up with ease.
Shippable is continous delivery platform that offers a containerized continuous integration. You can use custom Docker containers. Shippable gives you all the benefits of a single tenant build system with none of the complexity.