Code Playground Platforms

CodePen

Developer Community Platforms

Online community for front-end developers to share their work with snippets of HTML, CSS, and JavaScript.

CoSpaces Edu

STEM Education Platforms

Creation platform for K-12 classrooms to build VR and AR experiences with block-based coding.

Coderbyte

Assessment and Testing

Technical assessment platform providing coding challenges and interview prep for hiring developers with automated code evaluation.

Paiza.IO

Cloud IDE

Online browser-based code editor and runner supporting 30+ programming languages with shareable snippets.

JSFiddle

Developer Tools

Online JavaScript editor and playground for testing HTML, CSS, and JavaScript snippets.

Quokka.js

Developer Experience Platforms

Rapid JavaScript and TypeScript prototyping in your editor with live code execution and feedback.

CodeCombat

Developer Onboarding

Educational coding game teaching kids real typed code through levels in Python or JavaScript.

Frontend Mentor

Learning & Development

Frontend development practice platform with real world projects

Histoire

Developer Experience Platforms

Fast and beautiful interactive component playground powered by Vite for building design systems.

Stripe-owned browser-based Node.js sandbox for prototyping code in a shared workspace.