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Feature comparison of selected websites
	CodePen The front-end playground.	StackBlitz Full dev environments in the browser.
Rating	—	—
Pricing	Freemium	Freemium
Open source
Category	Developer Tools	Developer Tools
Key features	Instant front-end sandbox Preprocessor support Community showcases and challenges	Node.js running in-browser Instant framework templates Shareable reproductions
Pros	Zero-setup experimentation Endless learning by example	Real projects, not just snippets Perfect for bug reproductions
Cons	Not for multi-file projects Private pens need Pro	Browser memory limits Some native deps unsupported
	Visit codepen.io	Visit stackblitz.com

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