What are some alternatives?
When comparing CircleCI and Codeship, you can also consider the following products
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Bitrise - Tens of thousands of agencies, startups and enterprise companies with mobile apps - including Runkeeper, Grindr, Duolingo and more - use Bitrise to automate their way to increased productivity & speed
TeamCity - TeamCity is an ultimate Continuous Integration tool for professionals
Bamboo - Bamboo is a continuous integration and deployment tool that ties automated builds, tests and releases together in a single workflow.
Semaphore - Semaphore is a fully managed, high performance testing and deployment solution for your company. A Continuous Integration tool.