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CodePen by CodePen Inc. is an online code editor and front-end development playground that makes it easy to prototype, build, and share web experiences. Loved by designers, developers, and educators, CodePen combines a clean interface with real-time previews, community sharing, and collaborative tools—all accessible right in your browser.
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CodeSandbox by CodeSandbox B.V. is a powerful, cloud-based development platform designed for building and sharing full-stack web applications. With instant project setup, live collaboration, and GitHub integration, it’s the ideal workspace for developers who want to build, test, and ship modern web apps—right from the browser.
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jsFiddle by Piotr Zalewa is a lightweight, browser-based code playground that allows developers to quickly test, debug, and share front-end code. Known for its simplicity and speed, jsFiddle is a go-to tool for experimenting with HTML, CSS, and JavaScript in real time—perfect for quick demos, bug reports, and collaborative problem-solving.
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