Concourse vs Test Kitchen: What are the differences?
Concourse: Pipeline-based CI system written in Go. Concourse's principles reduce the risk of switching to and from Concourse, by encouraging practices that decouple your project from your CI's little details, and keeping all configuration in declarative files that can be checked into version control; Test Kitchen: Integration tool for developing and testing infrastructure code and software on isolated target platforms. Test Kitchen has a static, declarative configuration in a .kitchen.yml file at the root of your project. It is designed to execute isolated code run in pristine environments ensuring that no prior state exists. A plugin architecture gives you the freedom to run your code on any cloud, virtualization, or bare metal resources and allows you to write acceptance criteria in whatever framework you desire.
Concourse and Test Kitchen belong to "Continuous Integration" category of the tech stack.
"Real pipelines" is the primary reason why developers consider Concourse over the competitors, whereas "Automated testing" was stated as the key factor in picking Test Kitchen.
Concourse and Test Kitchen are both open source tools. It seems that Concourse with 3.99K GitHub stars and 482 forks on GitHub has more adoption than Test Kitchen with 1.62K GitHub stars and 543 GitHub forks.