Ruby 3.2.3

Online Ruby Compiler & Editor

Name: myCompiler Ruby
Author: myCompiler

myCompiler is a free online Ruby compiler, editor and code runner that lets you write, run, and share Ruby code directly in your browser. It works as your Ruby playground, sandbox, fiddle, cloud compiler, and online REPL. No downloads, no installation needed. Just open the editor and start coding with syntax highlighting, autocomplete, and instant output.

Start coding in Ruby How it works

27+ languages Used by 1M+ developers Free forever

main.rb

fruits = %w[apple banana cherry date]

fruits.each_with_index do |fruit, i|
  puts "#{i + 1}. #{fruit.capitalize}"
end

puts "\nTotal: #{fruits.length} fruits"
puts "Sorted: #{fruits.sort.join(', ')}"

Output

1. Apple 2. Banana 3. Cherry 4. Date Total: 4 fruits Sorted: apple, banana, cherry, date

How to run Ruby code online

Three steps to go from idea to running Ruby code in this online playground. No account required.

Write your code

Open the Ruby editor and start writing. The smart editor gives you syntax highlighting, autocomplete, and error detection as you type.

Click Run

Hit the Run button or press +Enter to run your Ruby code on secure, sandboxed cloud servers.

See results

Output appears instantly in the integrated terminal. Errors and exceptions show up with clear, helpful messages.

Everything you need to code in Ruby

A complete online Ruby IDE and coding playground in your browser. Write, run, and share code without any setup.

Zero setup required

Start coding in seconds with this browser-based Ruby interpreter. No downloads, no installations, no environment configuration. Open your browser, go to myCompiler, and start writing Ruby code immediately.

Works on any device with a web browser. Desktop, laptop, tablet, phone, Chromebook. There is nothing to install and nothing to configure.

Feature-rich code editor

Write Ruby with a professional-grade code editor built into your browser. Syntax highlighting colors your code for readability, making keywords, strings, and functions easy to distinguish at a glance.

Intelligent autocomplete suggests methods and properties as you type, and real-time error detection catches mistakes before you run your code.

Multi-file projects

Create and manage multiple files in a single project. Use the file sidebar to organize your code into modules, then import them across files just like in a desktop IDE.

Build modular applications with proper project structure. Each file is editable, and you can switch between them instantly.

Run code instantly

Click the Run button or press +Enter to execute your Ruby code instantly. This online code runner displays output immediately in the integrated terminal panel. Your code runs on secure, sandboxed cloud servers and results appear in seconds.

Error messages and tracebacks are displayed clearly, making it easy to find and fix issues. The terminal supports ANSI colors for rich output formatting.

Ready to try it? Write and run your first Ruby program in seconds.

Open Ruby editor

Ruby on myCompiler

myCompiler runs Ruby 3.2.3, always up to date with the latest stable release. You get a full browser-based IDE with syntax highlighting, intelligent code completion, multi-file project support, a built-in terminal for real-time output, and standard input (stdin) for interactive programs. Write, compile, run, and debug Ruby code on any device. Desktop, laptop, tablet, phone, Chromebook. Zero downloads, zero configuration, and no sign-up required. Save your programs with a unique URL and share them with anyone. You can also embed a working Ruby editor on your own website.

Use this online Ruby playground as a quick code executor for testing snippets, a coding sandbox for learning, or a cloud compiler for coding interview preparation. The editor includes dark mode for comfortable coding, keyboard shortcuts for faster workflows, and clear error messages with line numbers so you can debug quickly. Students use it for homework and practice. Teachers use it to share working examples. Developers use it to prototype ideas. myCompiler is beginner-friendly, fast, and completely free. It works in any modern web browser.

Start coding in Ruby

Ruby code examples

Common Ruby patterns you can try in the online compiler. Each example is ready to run.

Hello World in Ruby

main.rb

puts "Hello, World!"

Variables and Data Types in Ruby

main.rb

name = "Alice"
age = 30
height = 5.6
is_student = true
puts "#{name} is #{age} years old"

If-Else Conditionals in Ruby

main.rb

x = 10
if x > 0
  puts "Positive"
elsif x == 0
  puts "Zero"
else
  puts "Negative"
end

For and While Loops in Ruby

main.rb

5.times { |i| puts "Count: #{i}" }

total = 0
while total < 10
  total += 3
end
puts "Total: #{total}"

Functions in Ruby

main.rb

def greet(name, greeting = "Hello")
  "#{greeting}, #{name}!"
end

puts greet("Alice")
puts greet("Bob", "Hi")

Arrays and Collections in Ruby

main.rb

fruits = ["apple", "banana", "cherry"]
fruits << "date"
puts fruits[1]

person = { name: "Alice", age: 30 }
puts person[:name]

Classes and Objects in Ruby

main.rb

class Dog
  attr_reader :name, :breed

  def initialize(name, breed)
    @name = name
    @breed = breed
  end

  def bark
    "#{@name} says Woof!"
  end
end

dog = Dog.new("Rex", "Labrador")
puts dog.bark

Error Handling in Ruby

main.rb

begin
  result = 10 / 0
rescue ZeroDivisionError => e
  puts "Error: #{e.message}"
ensure
  puts "Done"
end

File I/O in Ruby

main.rb

# Write to file
File.write("output.txt", "Hello, File!")

# Read from file
content = File.read("output.txt")
puts content

Blocks and Iterators in Ruby

main.rb

numbers = [1, 2, 3, 4, 5]
evens = numbers.select { |n| n.even? }
squares = numbers.map { |n| n ** 2 }
puts "Evens: #{evens}"
puts "Squares: #{squares}"

Try these examples in the editor

How to take input in Ruby online

myCompiler supports standard input (stdin) for Ruby programs. Use Ruby's standard input functions to read user input. Enter your input data in the stdin panel before running your program.

This works for both single-line and multi-line input. You can read strings and convert to numbers using the language's built-in I/O functions.

Try it yourself

main.rb stdin supported

name = gets.chomp
age = gets.chomp.to_i

puts "Hello #{name}!"
puts "You'll be #{age + 1} next year."

stdin

Alice
25

Output

Hello Alice!
You'll be 26 next year.

No setup, no sign-up. Start writing Ruby code right now.

Start coding now

Getting started with Ruby online

You can start writing and running Ruby code right now without installing anything. Type your code, and click Run. This free Ruby code runner executes your program instantly and displays the output in the terminal panel below the editor. Open the Ruby online editor, type your code, and click Run.

If you're new to Ruby, use this online Ruby playground to start with the basics like variables, data types, conditionals, and loops. The code examples above cover all the fundamentals you need to get started. Each example can be copied into the sandbox and run immediately. No setup, no configuration.

As you progress, try creating multi-file projects, using libraries, and sharing your programs with others via URL. Sign up for a free account to save your work and build a personal library of programs. myCompiler works as a full online Ruby IDE right in your browser.

Who uses myCompiler

Whether you're learning to code, preparing for interviews, or prototyping ideas, myCompiler is built for you.

Students & Learners

Practice exercises, complete homework assignments, and experiment with code without installing anything on school or personal computers.

Teachers & Educators

Share code examples with students via unique URLs. Embed the compiler in course materials so students can run examples directly in the browser.

Interview Candidates

Practice coding interview problems, test algorithms, and verify solutions quickly during preparation for technical interviews.

Professional Developers

Quickly prototype ideas, test code snippets, or try out a library without setting up a local environment. Great for quick experiments.

Content Creators & Bloggers

Embed interactive examples in blog posts, tutorials, and documentation so readers can run code without leaving the page.

Teams & Collaborators

Share code snippets with colleagues via URLs. Others can view, run, and fork your code to build on your work.

myCompiler vs. local IDE

Why use an online Ruby compiler instead of installing one locally?

Feature	myCompiler	Local IDE
Setup time	Instant	Minutes to hours
Installation	None required	Ruby + IDE required
Device support	Any browser	Desktop only
Sharing code	One-click URL	Manual (file, git, etc.)
Languages	27+ in one place	One at a time
Cost	Free forever	Free to $$$
Works on Chromebook	Yes	Limited

What is Ruby?

Ruby is a dynamic, open-source programming language focused on simplicity and developer happiness. Created by Yukihiro "Matz" Matsumoto and first released in 1995, Ruby was designed to be natural to read and fun to write. Its elegant syntax is expressive and close to human language, making code feel like prose rather than machine instructions.

Ruby follows the principle of "least surprise", the language behaves the way an experienced programmer would expect. Everything in Ruby is an object, including primitive values like integers and strings. Ruby's metaprogramming capabilities allow you to write highly flexible, reusable code.

What is Ruby used for?

Ruby is most famous for web development via Ruby on Rails, the framework behind GitHub, Shopify, Airbnb, and Basecamp. Beyond Rails, Ruby is used for scripting and automation, DevOps tooling (Chef and Puppet are written in Ruby), prototyping, and data processing. Its readable DSL capabilities make it popular for configuration and infrastructure tools.

Ruby for beginners

Ruby is one of the most beginner-friendly programming languages available. Its natural syntax reads like English, and the interactive Ruby shell (irb) lets you experiment with code line by line. Ruby on Rails' "convention over configuration" philosophy lets beginners build full web applications quickly. Use myCompiler's online Ruby compiler to practice Ruby fundamentals without any local setup.

Ruby vs other languages

Compared to Python, Ruby has similarly clean syntax but is more focused on web development via Rails, while Python dominates data science and ML. Compared to PHP, Ruby's syntax is more elegant and Rails is considered a more modern web framework, but PHP has a larger share of existing web infrastructure. Compared to JavaScript for backend, Ruby is more opinionated but Rails' productivity for CRUD applications remains unmatched.

Why use an online Ruby compiler?

An online Ruby compiler, also called a Ruby playground or sandbox, lets you run Ruby code directly in your browser without installing Ruby or gem dependencies. It is ideal for learning Ruby syntax, practicing object-oriented concepts, testing regular expressions, and experimenting with blocks, procs, and iterators without any local environment setup.

myCompiler's online Ruby IDE supports the Ruby standard library including modules for JSON, CSV, file I/O, and more. You can write multi-file programs, provide stdin input, save your code, and share it via URL, completely free.

Why is Ruby so popular?

Ruby's popularity was cemented by Ruby on Rails, which introduced the concept of convention over configuration and revolutionized web development productivity in the mid-2000s. Rails demonstrated that a framework could be both powerful and a joy to use, inspiring frameworks in Python (Django), PHP (Laravel), and JavaScript (Ember). Ruby's expressive syntax, strong community, and wealth of high-quality gems on RubyGems.org keep it relevant for web startups and established businesses alike.

Ruby career opportunities

Ruby skills are valued for Rails developer, backend engineer, full-stack developer, and DevOps engineer roles. Companies like GitHub, Shopify, Stripe, and Airbnb are major Ruby users. Ruby on Rails remains one of the most productive frameworks for building web applications quickly, making Ruby developers highly sought after in the startup ecosystem.

Try Ruby online Free · No sign-up needed

Keyboard shortcuts

Code faster with these keyboard shortcuts in the myCompiler editor.

Run code

+ Enter

Save program

+ S

Toggle comment

+ /

Indent line

Tab

Unindent line

Shift + Tab

Undo

+ Z

Select next occurrence

+ D

Find & replace

+ H

Embed the Ruby compiler on your website

Add an interactive Ruby compiler to your website, blog, or learning platform. Readers can write and run Ruby code directly on your page without leaving it.

Perfect for technical tutorials, coding courses, documentation, and educational content. Save a program on myCompiler and use the embed link to add it to any webpage.

Embedded Ruby compiler, editor and code runner

HTML

<iframe
src="https://www.mycompiler.io
    /embed/ruby"
width="100%"
height="400"
frameborder="0">
</iframe>

Why developers choose myCompiler

A full-featured online IDE for Ruby and 27+ other programming languages.

27+ Languages

Python, JavaScript, Java, C++, Rust, Go, TypeScript, C#, and many more. All compilers and interpreters in one place. Switch languages instantly.

Dark & Light Mode

Switch between light and dark themes with one click. Code comfortably in any lighting condition, day or night.

Mobile Friendly

Fully responsive editor optimized for phones, tablets, and Chromebooks. Code on any device with a web browser. No app download needed.

Save & Share Code

Save programs to your account, share via unique URLs, and let others view, fork, and run your code. Great for collaboration and code reviews.

Tags & Organization

Organize your saved programs with tags and find them quickly with search and filters. Build a personal library of code snippets and solutions.

No Account Required

Start writing and running code immediately. No sign-up, no email, no credit card. Create a free account later only if you want to save your work.

Explore more programming languages

myCompiler supports 27+ languages. Switch between them anytime. All free, all in one place.

View all 27+ languages

Frequently asked questions

Common questions about using the online Ruby compiler, playground, and code runner.

Yes! myCompiler is completely free for all supported languages including Ruby. There are no subscriptions, no premium tiers, and no hidden costs. Every feature is available at no charge.

myCompiler keeps its Ruby environment up to date. You can see the exact version on the language details section of this page. We regularly update all language runtimes to their latest stable versions.

myCompiler provides a standard Ruby environment. While gem installation is not supported, you can use Ruby's built-in standard library which includes modules for file I/O, networking, JSON, and more.

Simply open the Ruby editor, write or paste your code, and click the Run button. Your code will be executed on our servers and the output will appear in the terminal panel within seconds.

Yes. Click Save to store your program. You will receive a unique URL that you can share with anyone. Recipients can view, fork, and run your code.

Yes. myCompiler supports multi-file projects. You can create, rename, and delete files in the sidebar. This lets you organize your Ruby code just like in a local IDE.

Yes. All code runs in isolated containers on our servers. Each execution gets its own sandboxed environment that is destroyed after completion. Your code cannot affect other users or our infrastructure.

Yes. myCompiler has a responsive design optimized for phones and tablets. You can write and run Ruby code on the go. The mobile interface uses tabs for switching between the editor, output, and file panels.

Yes. Click the Input tab in the bottom panel, type or paste your input data, then click Run. Your program will read from the input you provided.

Execution is fast. Code runs on our optimized cloud infrastructure and output typically appears within seconds. Execution time depends on the complexity of your program.

Yes. myCompiler provides an embed feature. You can copy an iframe snippet and paste it into your website, blog, or documentation. Visitors can edit and run code directly on your page.

myCompiler supports common editor shortcuts including Run (Ctrl/Cmd+Enter), Save (Ctrl/Cmd+S), Find (Ctrl/Cmd+F), and more. See the keyboard shortcuts section on this page for the full list.

No. myCompiler requires an internet connection because code is compiled and executed on our cloud servers. The editor itself loads in your browser, but running code requires connectivity.

myCompiler offers a fast, free, zero-setup environment with a modern code editor, multi-file support, dark mode, and instant sharing. It is ideal for learning, prototyping, interviews, and sharing code examples.

Yes. myCompiler is great for practicing algorithms and coding problems. You can write Ruby code, provide custom input, and test your solutions instantly. Save your work and come back to it anytime.

Use print statements or console output to trace your program's behavior. myCompiler shows all standard output and error messages in the terminal panel. Error messages include line numbers to help you locate issues.

Ready to write Ruby code?

Open the free Ruby playground and start coding immediately. No downloads, no account required.

Start coding in Ruby

Free · No sign-up required · Ruby 3.2.3