Where does my Ruby code run?

On a sandboxed third-party execution service, not on induwara.lk's servers. Your code is sent to an isolated compiler environment, run there, and the result is returned. Our server only forwards the request (with strict rate limits and size caps) — it never executes your code, so there's no way for a program to reach our systems.

Is the Ruby compiler free to use, and do I need an account?

Yes, it's completely free and there's no signup. Just write your code and press Run. It's meant as a quick, zero-setup way to compile and test code from any device, including a phone.

The core and standard library are available, which covers most learning and scripting needs. Installing arbitrary third-party gems isn't supported in this quick sandbox — for that, use a local Ruby setup with Bundler.

Is this good for learning Ruby?

Yes — Ruby's readable syntax makes it a great first language, and this lets you practise blocks, iterators, and string manipulation from any device with no install. Write a script, run it, see the output.

Which compiler / version is used?

It runs a recent Ruby (MRI) release, so blocks, modules, string methods, and the core/standard library behave as they do locally.

Are there limits on run time or code size?

Each run has a 30-second limit and a 50 KB code-size cap, and there are per-IP and overall rate limits so the shared compiler stays fast for everyone. For big projects use a local toolchain; this is built for snippets, exercises, and quick tests.

Can I read interactive input (stdin) while it runs?

Interactive input isn't wired into this editor yet — programs run start-to-finish and their output is shown. For exercises that need input, set the values directly as variables in your code. Everything printed to standard output appears in the output panel.

Developer · Runs in your browser

Online Ruby Compiler — write & run Ruby

Run Ruby instantly online, free and no signup. Your code executes on a sandboxed server — never on ours — so it's safe and works from any device.

By Induwara Ashinsana— Executive Director, Ryzera TechnologiesUpdated May 28, 2026

Ruby · runs on a sandboxed server

Loading editor…

Output

Press Run to execute. Output appears here.

How it works

Ruby is interpreted by the official MRI runtime. The server runs your script with a recent Ruby and returns the output of puts/print. Ruby's expressive standard library and core classes are available.

When you press Run, your Ruby code is sent to a sandboxed execution service that compiles and runs it in an isolated environment, then returns the output. It does notrun on induwara.lk's servers — our site only proxies the request, so your code can never touch our systems, files, or other users. Languages like Rubyneed a real compiler/runtime, which isn't practical in a browser, so this is the safe way to offer them.

The proxy is strictly bounded: a 30-second execution limit, a 50 KB code cap, and per-IP plus global rate limits that protect the shared compiler. There's no signup and nothing to install — write code, hit Run, read the output.