Online Ruby Compiler
main
# Online Ruby compiler to run Ruby code in the browser.
# Write Ruby code in this online editor and see instant output.
class Greeter
def greet
puts "Hello, Tutorsbot!"
end
end
g = Greeter.new
g.greet
Ruby is designed for developer happiness. Run Ruby online — great for learning elegant OOP patterns, blocks, and Ruby on Rails development fundamentals.
Free Online Ruby Compiler — Ruby in Your Browser
Run Ruby online without installing rbenv, rvm, or Ruby Installer. This playground executes your code in a sandboxed cloud environment with the full standard library available, so you can prototype a Rails-style DSL, test a metaprogramming snippet, or rehearse a Ruby interview question — all without setting up a local install. The editor uses the same professional code editor used by millions of developers, so syntax highlighting matches your local experience.
Ruby Playground for Backend and Rails Developers
Common use cases: prototype a custom Ruby DSL using `define_method` and `instance_eval`, test a regex against a log line, rehearse a Ruby-specific question (blocks vs procs vs lambdas, mixins vs inheritance) in front of an interview panel, or share a runnable snippet with a teammate. The compiler reports both Ruby syntax errors with formatted backtraces and the runtime output. For a guided path beyond playground experimentation, see Tutorsbot's Ruby Training and Ruby on Rails Training programmes.
Modern Ruby Features Supported
Ruby with the language features most asked about in interviews and used in production: blocks, procs, lambdas, `method_missing`, `define_method`, refinements, `Module#prepend`, the safe navigation operator (`&.`), pattern matching (preview), and `Enumerator::Lazy`. The standard library is fully available — `set`, `net/http`, `json`, `csv`, `date`, `erb`, `fileutils`, `pathname`, `stringio`, `securerandom`.
Is the Online Ruby Compiler Free?
Yes — 100% free for evaluation, learning, and interview preparation. No account, no captcha, no per-day limit. For production features (multi-file projects, Bundler-integrated gem dependencies, persistent repls, scheduled jobs), see Tutorsbot's Ruby on Rails Training or enterprise plans.
What This Online Ruby REPL Runs
The interpreter runs Ruby with the standard library bundled: `String`, `Array`, `Hash`, `Enumerable`, `File`, `IO`, `Net::HTTP`, `JSON`, `YAML`, `Date`, `Time`, `Set`, plus the entire `Regexp` engine. Pattern matching (`case ... in`), endless methods (`def square(x) = x * x`), block forwarding (`...`), keyword arguments separation, and `Fiber` all work. Bundler is not available, so no third-party gems (`rails`, `sinatra`, `rspec`). Multi-file projects are not supported; concatenate into a single file. Output streams both `puts` and `p` to the Output panel so you can debug with structured inspection.
Why use the Ruby online compiler?
- Ruby — blocks, procs, lambdas, metaprogramming, refinements
- Standard library: `set`, `net/http`, `json`, `csv`, `date`, `erb`
- Runtime errors reported with formatted backtraces
- Persistent workspace with autosave to localStorage
Frequently Asked Questions
- Is the Ruby online compiler free?
- Yes — Tutorsbot's Ruby compiler is completely free. No account required, no installation, and no usage limits.
- Do I need to install Ruby?
- No. The Ruby compiler runs entirely in your browser. No runtime, no SDK, no PATH configuration. Open the page and start coding.
- Is my Ruby code saved between sessions?
- Yes — your code autosaves to your browser's local storage so you can resume where you left off. You can also generate a shareable URL.
- Can I share Ruby code with others?
- Yes. Click the Share button to copy a URL that encodes your script. Anyone with the link can open and run it instantly — no account required on their end.
- Is the Ruby compiler safe to use?
- Absolutely. Every program runs in an isolated sandbox. Your local system is never exposed to the executed code, and nothing is persisted after the execution window.