Platforms
- Online
United States

flems.io is described as 'Flems is a playground for web development. It's ideal for prototyping ideas & sharing working front-end code examples' and is a Code Editor in the development category. There are more than 10 alternatives to flems.io for a variety of platforms, including Web-based, Android, Mac, Windows and Linux apps. The best flems.io alternative is Replit, which is free. Other great apps like flems.io are CodePen, jsFiddle, JSPad and JS Bin.

Publish HTML quickly with open source web editor, HTMLhouse. Use the editor / real-time preview to build your HTML page, and press publish when you're done. That's it! No sign up, no fuss.

A web-based IDE to teach programming in the classroom. Easily create and share exercises with students. Analyze and inspect students' submissions.


CodeBunk provides a Realtime Collaborative Editor with Compile/Run. CodeBunk is an Online Compiler/Interpreter for PHP, Python, Ruby, Perl, Lua, Javascript, C, C++. CodeBunk also has Peer-to-Peer Video/Audio chat facility.

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.



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




A collaborative online web development platform using HTML, CSS and JavaScript with a focus on design systems and financial applications.

Aaditor is World's first HTML editor with drag layout. Aaditor has a function of full screen result. You can change the layout of Aaditor according to your wish. All the html,css and js boxes of Aaditor can be dragged , resized and minimized .
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.



codeExec let you create your own web application allowing users to create and execute code written in JavaScript, HTML, and CSS online.




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.


