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 kodeWeave.
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 lets one easily test snippets of JavaScript/CSS/HTML code on-the-fly, adding optional libraries like jQuery.
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.
shelf.gg is an open source pastebin that makes it easy to find and share lists of resources.
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.
CodeSandbox is an online editor with a focus on creating, sharing and importing new React projects
JSitor is an online tool for testing and showcasing user-created and collaboration HTML, CSS, JavaScript and NodeJS snippets.
Flems is a playground for web development. It's ideal for prototyping ideas & sharing working front-end code examples.
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I like both of them but CodePen allows you to save files and edit them later.