Ruby 3.3

Run Ruby Online

Execute Ruby code instantly in a secure, isolated sandbox. No setup, no installs — just write and run.

main.rb

# Ruby 3.3
puts 'Hello from Ruby!'

# Idiomatic Ruby — blocks and enumerables
squares = (1..10).map { |n| n * n }
puts "Squares: #{squares.inspect}"

# Rails-flavored: simple model-like class
class User
  attr_accessor :name, :age
  def initialize(name, age) = (@name = name; @age = age)
  def adult? = age >= 18
end

alice = User.new('Alice', 30)
puts "#{alice.name} adult? #{alice.adult?}"

Output

Click "Run Code" to execute...

About Ruby

Ruby is the language behind Rails — beloved for its clean, expressive syntax. It powers GitHub, Shopify, and Airbnb. Perfect for web backends, scripting, and DSLs where developer happiness matters.

Our sandbox runs Ruby 3.3 with the full standard library. gem install is available in Pro+ sessions.

Sandbox Features

Secure execution with Docker + gVisor isolation
Ruby 3.3 with standard library
Up to 600s execution time (Mega tier)
Stdin, expected_output, command_line_arguments
Stateful sessions and package install (Pro+)
REST API for programmatic access

Use Ruby with stateful sessions

Open a session once, then call execute repeatedly — variables, files, and installed packages persist between runs. Perfect for code interpreters and REPL-style agents.

# 1. Create a session
curl -X POST https://api.sandboxapi.dev/v1/sessions \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"language":"ruby","idle_ttl":300}'
# → {"id":"sess_abc","language":"ruby",...}

# 2. Execute — first call
curl -X POST https://api.sandboxapi.dev/v1/sessions/sess_abc/execute \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"code":"x = 42"}'

# 3. Execute again — state carries over
curl -X POST https://api.sandboxapi.dev/v1/sessions/sess_abc/execute \
  -H "X-RapidAPI-Key: $KEY" \
  -d '{"code":"puts x * 2"}'

Read the sessions docs →