Find inconsistent components, typography, and mobile layout issues in your GitHub changes, with explanations and suggested code fixes.
Phosphor, Tabler, Hugeicons, Remix, Lucide, Heroicons and Material Line in a single searchable grid. Search by what the drawing means, set the size and stroke before you copy, take it as React, SVG, Vue or React Native, and see the same icon in every other family it exists in.
Build an animated WebGL shader background in your browser with knobs instead of code. Tune the style, palette, surface, and motion, make it react to the cursor, then export it as an image, video, or a drop-in React component. Remix and publish looks the whole community can build on.
Drop in a photo and turn it into ASCII, pixel, or dot art right in your browser. Tune the look with sliders or just describe it, export it as an image, video, or GIF, then remix and publish looks the whole community can build on.
Connect 21st to Claude, Cursor, Codex, Lovable, or any MCP client in one click, and drive the whole catalog from a rebuilt command-line tool: search, install, generate, and publish from the terminal.
Arrange your profile as a free-form board: feature your best components, add links, photos, and GIFs, drop a donation link, let people hire you, and point at your pro components and socials. All from one page.
Describe your idea once and every frontier model builds it at the same time, so you compare real takes instead of betting on one. Add community components and themes as context, keep the best, and hand the prompt to your agent.
Search 21st from Claude and results come back as an inline, interactive card gallery: previews, hover videos, one-tap get code. Not JSON, not a link dump. Actual UI, in chat. Powered by MCP Apps.
Browse what the community built, preview it live, and ship your own in a couple of clicks. Free on 21st, and every theme doubles as a palette for 21st AI.
For almost everyone, nothing changes: every signed-in user still gets 2 free component copies every day. Membership is just a way to support 21st if it is useful to you.
Publish components from Studio or the CLI, keep them private to your team, and have your agent install from your library when building UI, instead of inventing components from scratch.
A detailed review of the database defacement attack on February 26, 2026 - what happened, why, and how we fixed it.