Founder of CircleCI here. Some notes on this: CircleCI does have free and public Open Source builds: http://blog.circleci.com/a-step-into-open-source/ http://

Founder of CircleCI here. Some notes on this: CircleCI does have free and public Open Source builds: http://blog.circleci.com/a-step-into-open-source/ http://blog.circleci.com/a-step-into-open-source/. We allow you run three concurrent open source builds for free, more than anyone else. Also, we allow larger teams to pay to run more builds, which can be really valuable for large projects. CircleCI is basically built for large teams, for example Shopify: https://circleci.com/stories/shopify https://circleci.com/stories/shopify. There's a few major features that support that. For example, large teams typically have tons of integration/browser tests: we allow you to SSH and VNC into the build to figure out why browser tests are failing. This is a critical feature for large teams. Similarly, parallelism is built into CircleCI from the ground up - we've spent a ton of time making the really simple and automatic. We can automatically split and load-balance test suites across dozens of machines, and we have huge customers using this to reduce multi-hour test suites to run in minutes. This is much more support than anyone else, if it's even possible you have to go through a long process to manually enable parallelization. We have support for GitHub Enterprise in our Enterprise product (which you can run in AWS VPC). See https://circleci.com/enterprise https://circleci.com/enterprise for details. For small teams, we don't actually start at $50 - we start at free. If you're less than 5 people, you likely won't pay anything to use CircleCI. The free version is fully featured and lets you run 1 build at a time (for $50, you'll get a 2nd concurrent build, which you'll need as your team grows). There's a couple of features that are listed for other products that aren't listed for CircleCI - not sure why they aren't listed: - Unlimited open source projects with full functionality. - Has own headless browser support (albeit Firefox only). [actually, on CircleCI we also support chrome] - Allows to cluster tests and run them in parallel. - Seamless UI integration with GitHub. Hope that helps! Happy to answer any questions too.