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Online Ruby Compiler and Playground

Browser-based compiler and playground for Ruby, Progsity IDE.

About Ruby

Ruby blends readable syntax with powerful metaprogramming, popularized by Rails but still beloved for scripting and DevOps. This Ruby playground runs your scripts with MRI-style behavior so you can practice enumerables, blocks, and string ergonomics in the browser.

Output goes to stdout; errors show as stack traces in stderr. It is a friendly environment to try Enumerable methods and small CLI-style logic.

Sign in to save snippets you reuse when teaching or blogging about Ruby idioms.

How to use

  1. Write top-level Ruby. puts prints a line; p inspects values.
  2. Use gets.chomp if you read stdin; paste matching lines in the stdin panel.
  3. Iterate with .each and blocks; fix NameError messages if a method is missing.

FAQ

Is Ruby free to run?›

Yes. Execution is free; snippet storage follows account limits.

Which Ruby version?›

A modern MRI-compatible runtime in the sandbox. Print RUBY_VERSION to verify.

Can I require gems?›

Phase 1 focuses on the standard library, no arbitrary gem installs.

Save Ruby code?›

Yes after sign-in.

Compiler or playground?›

Ruby is interpreted; you still get quick feedback loops like an online playground.

Related languages

Code examples

Tap “Try this” to load sample code into the editor above.

  • times block

    3.times { |i| puts "step #{i}" }

  • Enumerable select

    nums = [1, 2, 3, 4, 5]
puts nums.select { |x| x.even? }.inspect

  • Hash merge

    h = { a: 1, b: 2 }
puts h.merge(c: 3).inspect

  • String interpolation

    name = "learner"
puts "Hello, #{name.upcase}!"