Kemal is great, lightweight, fast!!! and I’m using it for a growing number of infrastructure / microservices at CircuitLab (exposing JSON APIs, mostly), as well as to serve web requests on my side project at Total Real returns.<p>If you want to play with Kemal and/or Crystal without installing anything besides Docker, I made <a href="https://github.com/compumike/crystal-docker-quickstart" rel="nofollow">https://github.com/compumike/crystal-docker-quickstart</a> . You should be able to add Kemal to shard.yml, edit d_dev to expose port 3000 (there’s a line already there, just uncomment it), and get your first Kemal microservice up in a few minutes :)