JS Bin is an online JavaScript and CSS editor that helps you quickly prototype and test your code.
Free with premium options
Best RunJS Alternatives ranked by AI · updated Aug 2026
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RunJS is a desktop JavaScript and TypeScript playground that executes code as it is edited and displays results in an interactive console. It is intended for developers who want a dedicated local scratchpad outside a full IDE.
Top 6 RunJS alternatives
CodePen is a social development environment for front-end designers and developers. It’s the best place to build and deploy a website, show...
Free with premium options
CodeSandbox is an online code editor and prototyping tool that makes it easy to create, share, and collaborate on web development projects.
Free with paid plans available
Online IDE for web applications with instant setup and collaboration features.
Free with premium options
Wallaby.js is an integrated continuous testing tool for JavaScript.
$99 - $199 per year
Quokka.js is an IDE extension that evaluates JavaScript and TypeScript as you type, displaying runtime values and errors directly beside the code....
Pros
- Shows evaluated values inline without leaving the editor
- Supports JavaScript, TypeScript, JSX, and common module workflows
- Provides faster local feedback than browser-based playgrounds
Cons
- Requires a compatible local IDE rather than working in a browser
- Advanced features require a paid Pro license
- Less suitable than full notebooks for long-form explanations and visualizations
Free for Community; Pro from $159/year
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