How do I make apps?

Question

So I have a really good knowledge of ruby. Can I make apps with it? If yes, how?

Answer 1

If you are on MacOS you can write crossplatform apps on RubyMotion on Windows you can use JRuby or Ruboto

Answer 2

Ok thanks. I will check JRuby or Ruboto. Are they free?

Answer 3

Yes they are free :)