Built for readability and developer happiness

Ruby Compiler Online — Run Ruby Code in Your Browser

Ruby was explicitly designed around programmer happiness and readable syntax — code that reads almost like a sentence. It's best known as the language behind Rails, which made it the go-to choice for fast web app prototyping for years.

def main
  puts "Hello, world!"
end

main

What people use Ruby here for

• Practicing Ruby syntax and blocks without installing a Ruby version manager
• Testing a small script before dropping it into a Rails app
• Working through a Ruby koans-style exercise set

No installs, no signup

Code you write here runs on a real, self-hosted Judge0 execution backend — actual Ruby compiler or interpreter output, not a simulation. The actual Ruby interpreter (MRI) runs your code, so standard-library behavior matches what you'd see locally without installing a version manager first. See the full list of supported languages or read more about how AnyCompiler works.