The MacOS and Windows App automate the process of running Docker on a non-Linux OS. It sets up a virtual machine, volume mounts, port forwarding, and so on, and the Docker CLI then allows you to just "docker run" an image and have navigation to "http://localhost:3000" just work.

Recently the app gained the ability to run a Kubernetes cluster as well, which makes spinning one up on a machine quite a lot easier to evaluate those workflows.