JSFiddle is an online IDE service and online community for testing and showcasing user-created and collaborational HTML, CSS and JavaScript code snippets, known as 'fiddles'.

There are many alternatives to CodePen as a web app if you are looking for a replacement. The best Online alternative is jsFiddle, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to CodePen and loads of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to CodePen are Replit, Firebase Studio, CodeSandbox and JS Bin.
JSFiddle is an online IDE service and online community for testing and showcasing user-created and collaborational HTML, CSS and JavaScript code snippets, known as 'fiddles'.

Replit is a collaborative cloud development environment offering in-browser IDE features like AI assistance, real-time collaboration, Git support, hosting, deployment, syntax highlighting, plugin extensibility, ad-free UI, dark mode, and live code sharing.




A cloud-based, agentic development environment designed to accelerate how you build, test, deploy and run production-quality AI applications, all in one place.




CodeSandbox is an online editor with a focus on creating, sharing and importing new React projects


JS Bin is a collaborative open source JavaScript debugging tool. Enter Javascript in one pane and HTML in the other and see the result; share using a short URL. Choose popular JS libs from a menu, so you don't have to remember the URL.

JSPad is a fast and lightweight online code editor for writing, testing, and previewing HTML, CSS, and JavaScript snippets instantly.






JSitor is an online tool for testing and showcasing user-created and collaboration HTML, CSS, JavaScript and NodeJS snippets.




dabblet is an interactive playground for quickly testing snippets of CSS and HTML code. It uses -prefix-free, so that you won't have to add any prefixes in your CSS code. You can save your work in Github gists, embed it in other websites and share it with others.

Flems is a playground for web development. It's ideal for prototyping ideas & sharing working front-end code examples.


goormIDE is a powerful cloud IDE service to maximize the productivity for developers and teams. You can build your own development environment with just a few clicks and collaborate in real-time on the same docker container.




Very similar, both have fields for HTML/JS/CSS and both don't require an account.