CodeJS is described as 'Powerful, free online code editor that serves as an excellent alternative to JSBin, CodePen, and JSFiddle. What sets it apart is its unique integration of three AI assistants' and is a Code Editor in the development category. There are more than 25 alternatives to CodeJS, not only websites but also apps for a variety of platforms, including Self-Hosted, Android, Mac and Windows apps. The best CodeJS alternative is CodePen, which is free. Other great sites and apps similar to CodeJS are jsFiddle, JSPad, JS Bin and vscode.dev.
CodePen is a communal front-end development platform providing real-time HTML, CSS, and JavaScript previews. Users can build projects, test code, and enhance skills through challenges. Features include Presentation Mode for conferences and a vast active community for sharing and discovery.
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'.
JSPad is a fast and lightweight online code editor for writing, testing, and previewing HTML, CSS, and JavaScript snippets instantly.
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.
kodeWeave is a realtime coding playground for HTML, CSS and Javascript. Similar to JSFiddle and JSBin, but kodeWeave was made to work offline but also as a prototyping application to build applications for desktop operating systems while on mobile devices.
CodeSandbox is an online editor with a focus on creating, sharing and importing new React projects
A browser-based coding environment for front-end developers. Write HTML, CSS, and JS with a VS Code-grade editor (Monaco), live preview, SCSS/TypeScript/Babel support, and an AI chat assistant for debugging and suggestions. All projects save to local storage.
snippet.host is a minimal text and code snippet hosting. With memorable domain name, it is free, lightweight, with no ads or cookies. Features include syntax highlighting in multiple languages, easy-to-use API and Tor hidden service support.
TIO is a family of online interpreters for an evergrowing list of practical and recreational programming languages.
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.
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I like both of them but CodePen allows you to save files and edit them later.