Fastpen is an open source alternative to codepen that just stores the source code compressed, in the url.


Leporello.js is described as 'Interactive functional programming environment for JavaScript' and is an app in the development category. There are more than 10 alternatives to Leporello.js for a variety of platforms, including Web-based, Android, Android Tablet, Linux and iPad apps. The best Leporello.js alternative is Replit, which is free. Other great apps like Leporello.js are CodePen, jsFiddle, JSPad and JS Bin.
Fastpen is an open source alternative to codepen that just stores the source code compressed, in the url.


Simple Code Editor for playing with Javascript and Conducting Interviews. New alternative for JSBin and JSFiddle.

JSArena is the most popular SaaS alternative to Leporello.js.

HTCSJS is an online HTML, CSS and JavaScript coding tool. It functions on mobile (unlike JSFiddle), and allows any* external resources. It also allows pasting on iOS, unlike many others. http://shhnowisnottheti.me/demo/
*varies b/c it uses data URLs




Agiphi Studio is an AI-native builder platform that empowers developers, startups, and enterprises to design, test, and deploy AI copilots, intelligent workflows, and data-driven applications, all in one unified studio.



CodeJS is a 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.



BoxCoding is a website for frontend developers featuring hundreds of community-made CSS and HTML UI elements. All elements are open source and free to use. Explore Elements and Free Source Code in HTML, CSS and JavaScript that can be used in your next project.


