Code Playgrounds

HTML / CSS / JS

A fast, distraction-free CodePen alternative — runs entirely in your browser.

JavaScript

Run, debug and share JavaScript instantly — a focused JS-only REPL.

Markdown

Live GitHub-flavored Markdown preview with syntax highlighting.

TypeScript

Type-check and run TypeScript instantly in your browser.

React

Multi-file React playground with hot reload and npm packages.

Vue 3

Vue 3 single-file component playground.

Svelte

Reactive Svelte components, no build step required.

Tailwind

Prototype UIs with Tailwind utility classes instantly.

Python

Run real Python 3 in your browser — no install, no server.

SQL

Query a real SQLite database in your browser.

JSON

Edit, validate and transform JSON with JSONPath queries.

YAML

Edit YAML with live JSON preview and schema validation.

Mermaid

Live Mermaid diagram editor — flowcharts, sequence, gantt, ER and more.

SVG

Draw, edit and preview SVG with live rendering.

Canvas

Sketch in HTML Canvas 2D with hot reload.

GLSL Shaders

Write fragment shaders, see them live like Shadertoy.

Less

Compile Less to CSS instantly — nested rules, mixins, variables.

TOML

Edit TOML with live JSON preview and validation.

CSV

View, edit and convert CSV with live JSON preview.

XML

Edit XML with live JSON preview and validation.

Lua

Run Lua 5.4 in your browser — embeddable, lightweight, fun.

jq

Transform JSON with jq filters — instantly, in your browser.

Ruby

Run real Ruby 3.3 in your browser via ruby.wasm.

PHP

Run PHP 8 in your browser — no server, no install.

Go

Compile and run Go on the official Go playground service.

RegEx

Build and debug regular expressions visually.