CodePen: Pens & Source Codes

CodePen brings the world’s best HTML/CSS/JS experiments to your pocket. Browse trending Pens, follow creators, preview live demos and open, edit or publish your own front‑end projects — all with a fast, polished UI built for mobile. Key features • Live preview & editor — real-time HTML/CSS/JS preview with syntax highlighting, console and resource management. Tweak code and see results instantly. • Browse & discover — Trending, Popular, Collections, Blogs and Authors; curated feeds make it easy to find inspiration. • Publish & share — Create new Pens, save drafts, publish to your account and share beautiful preview images or direct links. • Code editor tools — multi‑tab editor, code panes, keyboard toolbar, inspector overlay and dark/light editor themes for comfortable coding. • Multimedia support — embedded video, images and full‑screen galleries for immersive previews. • Offline cache & sync — local caching for faster browsing and offline access; favorites sync across devices. • Social features — like, comment, follow authors and join the community from inside the app. • Membership & purchases — upgrade to remove ads and unlock premium features (in‑app purchases supported). • Notifications & updates — get notified about new activity, posts and updates (push notifications supported). • Accessibility & localization — translated UI and adjustable fonts/themes for a global audience. Why CodePen mobile? • Instant experimentation — launch prototypes fast and iterate on the go. • Full‑featured mobile editor — a surprisingly powerful editor tailored for touch and productivity. • Learn from creators — discover real‑world front‑end patterns, UI tricks and animation ideas. • Built for performance — efficient caching, smooth UI and integrated previews that respect bandwidth. Who is this for? • Front‑end developers who want to test, demo and tinker away from the desktop. • Designers who prototype micro‑interactions or share visual experiments quickly. • Students and learners exploring HTML, CSS and JavaScript with immediate visual feedback. Permissions & monetization • Requires internet access, push notifications and Play Billing for in‑app purchases. Ads are included (can be removed via membership). Support & privacy • Help and feedback available in the app. Privacy policy & terms are accessible from the settings screen. Download CodePen and carry creative front‑end experiments everywhere — code, preview and publish from your phone.