CodePen is described as 'A communal platform for front-end development offering real-time previews, project building, and showcases, enhancing skills through challenges' and is a very popular Code Editor in the development category. There are more than 50 alternatives to CodePen, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and Self-Hosted apps. The best CodePen alternative is jsFiddle, which is free. Other great sites and apps similar 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.
I like replit because they have a great free version with AI autocomplete and chat.
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.
Qoder is an AI-powered agentic coding platform and IDE that automates complex software development tasks using autonomous AI agents.
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.
Web Maker is an easy, quick and offline web experiment playground available as a Chrome extension, with open source code available at GitHub.
1- Simpler to use 2- Code highlighting 3- And what I was looking for is : html auto completion, css and JS auto-suggestion
Has almost all features of CodePen and even works offline.
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.
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Very similar, both have fields for HTML/JS/CSS and both don't require an account.