< playground />

Code. Run. Learn.

Pick a language and start coding in your browser — no setup required.

12

Languages

50+

Starter templates

Browser

No install for Phase 1

/// languages

Choose your playground

HTML / CSS / JS

Live preview with HTML, styles, and vanilla JavaScript.

Runs in browser
Open playground

Python

NumPy, Pandas, Matplotlib & scikit-learn via Pyodide.

Runs in browser
Open playground

SQL

SQLite in the browser with sample HR & product data.

Runs in browser
Open playground

JavaScript

Sandboxed ES modules with console and import maps.

Runs in browser
Open playground

TypeScript

Strict TypeScript transpiled and run in your browser.

Runs in browser
Open playground

React JSX

Babel + React 18 preview with Tailwind in the iframe.

Runs in browser
Open playground

PHP

PHP 8.3 in your browser via WebAssembly — no server round-trip.

Runs in browser
Open playground

Node.js

QuickJS in your browser — Node-style built-ins, sandboxed (no npm, no network).

Runs in browser
Open playground

Next.js

Educational snippets — Server Components, routes, actions, and more.

Server sandbox
Open playground

Java

Java on onlinecompiler.io — auto-wrap for bare main code.

Server sandbox
Open playground

C

C (GCC) on onlinecompiler.io — classic systems programming.

Server sandbox
Open playground

C++

C++ (GCC) on onlinecompiler.io — STL and modern C++.

Server sandbox
Open playground

Go

Go on onlinecompiler.io — fast compile and run.

Server sandbox
Open playground