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Online Ruby Compiler

Write, run, and share code snippets — no setup required.

main.rb
Output
Click Run to see the output here.

Run Ruby online in your browser

This is a free online Ruby playground and code runner. Write Ruby code directly in your browser, hit Run, and execute on Ruby 3.3 with YJIT enabled in seconds — no rbenv, no rvm, no bundler setup required. It's the fastest way to test a block, try a new method, or work through a Ruby interview problem.

Under the hood, the editor uses the same engine as VS Code (Ruby syntax highlighting, autocompletion, error squiggles), and your code runs on Ruby 3.3 with Nokogiri, HTTParty, RSpec, minitest, Faker, colorize, tty-prompt and CSV already installed as gems. Whether you're parsing HTML, calling a JSON API, or exploring metaprogramming, this online Ruby playground goes from idea to output in seconds.

What makes this Ruby playground useful

  • Instant Ruby execution — write code, press Run, and see output from Ruby 3.3 with YJIT in seconds, no rbenv or bundler needed.
  • Full Ruby syntax highlighting, autocompletion, and clear error messages with line numbers — the same editor engine that powers VS Code.
  • Stdin input supported — gets, $stdin.read, and readlines all read from the playground's input box, so interactive Ruby scripts and interview-style problems work end-to-end. No install — no rvm, rbenv, or bundler setup.
  • Ruby 3.3 with Nokogiri, HTTParty, RSpec, minitest, Faker, colorize, tty-prompt and CSV pre-installed — parse HTML, hit APIs, and run tests instantly.

What you can build in the Ruby playground

  • Blocks, Procs, and lambdas — core Ruby idioms you can test one method at a time, plus Enumerable (map, select, reduce, each_with_object).
  • Small HTML-scraping or JSON-API scripts: use Nokogiri to parse HTML and HTTParty to hit an endpoint — both gems are already installed.
  • Quick Ruby experiments — test a regex, try a metaprogramming trick with define_method, verify a class_eval, or confirm how Symbol#to_proc works.

Online Ruby compiler FAQ

Is the online Ruby compiler free?
Yes. The Ruby playground is completely free — no sign-up, no Ruby to install, no rvm or rbenv to configure. Open the page and run code on Ruby 3.3.
Do I need to install Ruby or bundler to use the online runner?
No install needed. You don't need Ruby, rbenv, or bundler on your machine — the online Ruby runner executes your code on Ruby 3.3 with YJIT enabled and returns the output in seconds.
Does the Ruby playground work on mobile and Chromebooks?
Yes. The Ruby playground runs on any modern browser — desktop, tablet, or mobile. Great for running Ruby from a Chromebook, iPad, or school computer where you can't install Ruby.
Does the Ruby playground support gets and stdin?
Yes. The playground has a stdin input box — gets, $stdin.read, and readlines all read your typed lines the same way they would when you run ruby script.rb locally. Feed input line-by-line and iterate with $stdin.each_line just like a normal CLI script.
How do I learn Ruby after trying the playground?
Edit the sample Ruby code, press Run, and iterate. When you want structured practice, Coddy's interactive Ruby course covers blocks, classes, modules, Enumerable, and metaprogramming with hands-on exercises.