JS Bin
JS Bin is a tool for experimenting with web languages. In particular HTML, CSS and JavaScript, but JS Bin also supports other languages too (like Markdown, Jade and Sass). JS Bin is ultimately a code sharing site. Along with the code, the complete output of the code is also shared with other developers, colleagues and/or students. As you type into one of the editor “panels”, you and anyone watching your bin will see the output being generated in real-time in the output panel. There’s many features tucked away inside JS Bin, but our design principle is that everyone gets a cursor. So when you arrive for the first time, you’ll be greeted with an initial start HTML page and very little else (though you can customise your default code). If you register (which is free and simple), your profile will remember which bins you created, but also give you a shortcut URL that always takes you to the last bin you worked on.
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CodeSandbox
CodeSandbox is a cloud development platform that empowers development teams to code, collaborate, and ship projects of any size from any device in record time.
Run your code in powerful microVMs and build anything without limits. We configure your environment for you and keep your code always ready, behind a URL.
Boxy, the CodeSandbox AI coding assistant, is also now available to all Pro subscribers.
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Replit
Replit is an AI-powered app development platform that helps users turn ideas into websites, mobile apps, designs, slides, animations, data visualizations, games, documents, and spreadsheets without needing to code manually. The platform features Agent 4, which can interpret prompts, plan requirements, write production-ready code, evolve projects, and publish apps. Replit includes Infinite Canvas for visually exploring and tweaking designs before applying them directly to an app. Parallel Agents let multiple tasks run at once, helping teams build authentication, databases, design, and other features faster. Built-in infrastructure includes authentication, database, hosting, monitoring, AI integrations, and connections to services such as OpenAI, Stripe, and Google Workspace. Built for individuals, teams, and enterprises, Replit helps users prototype, collaborate, launch, and scale software from one workspace.
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CodePen
CodePen is a social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn and debug, and find inspiration. Find inspiration from 1.8 million+ front-end designers and developers. Browse and share work from world-class designers and developers in the front-end community. The CodePen Editor is highly customizable. There is autocomplete and Emmet for speed and accuracy. Plus you can set up smart defaults for starting new work. Completely customize the look of code demos on your own site. Change the look of your site? Just change the theme and all your Embedded Pens change too. Need to use an image in a Pen? No more awkwardly finding alternate hosting for it, you can drag-and-drop it right onto CodePen and we'll host it for you. And not just images! CSS, JSON files, SVGs, media files, whatever! Projects is the most powerful feature of CodePen.
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