The best free alternative to CodePen is jsFiddle. If that doesn't suit you, our users have ranked more than 50 alternatives to CodePen and loads of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to CodePen are Replit, Firebase Studio, Qoder IDE and CodeSandbox.
jsFiddle lets one easily test snippets of JavaScript/CSS/HTML code on-the-fly, adding optional libraries like jQuery.
Most users think jsFiddle is a great CodePen alternative.
jsFiddle is the most popular Web-based alternative to CodePen.
jsFiddle is the most popular free alternative to CodePen.
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.
Most users think Replit is a great CodePen alternative.
Replit is the most popular Android, iPhone, iPad & Android Tablet alternative to CodePen.
A cloud-based, agentic development environment designed to accelerate how you build, test, deploy and run production-quality AI applications, all in one place.
Qoder is an AI-powered agentic coding platform and IDE that automates complex software development tasks using autonomous AI agents.
Qoder IDE is the most popular Windows, Mac & Linux alternative to CodePen.
CodeSandbox is an online editor with a focus on creating, sharing and importing new React projects
Almost everyone thinks CodeSandbox is a great CodePen alternative.
CodeSandbox is the most popular Open Source alternative to CodePen.
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.
vscode.dev is the most popular Self-Hosted alternative to CodePen.
JSitor is an online tool for testing and showcasing user-created and collaboration HTML, CSS, JavaScript and NodeJS snippets.
Almost everyone thinks JSitor is a great CodePen alternative.
JSitor is the most popular SaaS alternative to CodePen.
Flems is a playground for web development. It's ideal for prototyping ideas & sharing working front-end code examples.
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.
Almost everyone thinks Web Maker is a great CodePen alternative.
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Very similar, both have fields for HTML/JS/CSS and both don't require an account.