Codeply is a free, web-based online HTML, CSS, and JavaScript editor and responsive design playground geared toward frontend developers and web designers. It functions as a cloud IDE and rapid prototyping tool, allowing users to build, test, and share code snippets or full prototypes directly in the browser without needing to set up a local environment.

Web Design Ledger +3

Key Features of Codeply:

Responsive Focus: Codeply is designed for testing responsive layouts, featuring built-in buttons to toggle screen sizes (mobile, tablet, desktop) to see how designs behave.

Framework Support: It supports popular frontend frameworks, including Bootstrap (3, 4, and 5), Foundation, Tailwind CSS, Angular, Vue.js, and React.

Ready-to-Run Templates: Users can leverage thousands of snippets, starter templates, and layout examples.

Live Preview: It offers a real-time preview of the code being written.

Community and Social Features: Developers can create, save, and share "plies" (code projects), which can be tagged for searchability.

Medium +5

It is often used as a tool to quickly try out CSS frameworks or to prototype layouts, acting as a "playground" for frontend development.