Online Ruby Compiler

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

main.rb

Alice
30

Output

Click Run to see the output here.

name = gets.chomp
age = gets.to_i
puts "Hello, #{name}! You are #{age} years old."

Run Ruby online in your browser

A free online Ruby playground and code runner. Write Ruby in your browser, hit Run, and the code executes on Ruby 3.3 with YJIT enabled in seconds. No rbenv, no rvm, no bundler setup to configure first.

The editor is built on the same engine as VS Code, so Ruby syntax highlighting, autocompletion, and error squiggles all work. Code runs on Ruby 3.3 with Nokogiri, HTTParty, RSpec, minitest, Faker, colorize, tty-prompt and CSV already installed as gems — good for parsing HTML, calling a JSON API, or exploring metaprogramming.

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, powered by the same editor engine as VS Code.
Stdin input is 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 rvm, rbenv, or bundler setup on your end.
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 free to use. No sign-up, no Ruby to install, and 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 in any modern browser, on desktop, tablet or mobile. Good 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. 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 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 something more structured, Coddy's interactive Ruby course covers blocks, classes, modules, Enumerable, and metaprogramming with hands-on exercises.