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

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