Unfortunately, you can’t use actual-Rails in Crystal (it’s written in Ruby which is similar but not exactly the same). But there are Rails-like frameworks you

Unfortunately, you can’t use actual-Rails in Crystal (it’s written in Ruby which is similar but not exactly the same). But there are Rails-like frameworks you can use in Crystal that are just as much fun (though understandably less mature). Check out Amber, Lucky, and Kemal to give you an idea of what’s out there.