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@21st_dev

Building blocks for AI apps

San Francisco Katılım Ekim 2025
2 Takip Edilen2.5K Takipçiler
21st
21st@21st_dev·
We apologize - your components have been fully removed. We index open-source projects across the web, and in this case our system failed to properly flag your license. We're improving our license detection to make sure this doesn't happen again. If you ever need to reach us directly: support@21st.dev
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Sidi jeddou
Sidi jeddou@sidi_jeddou_dev·
Wait, this YC startup are doing something illegal. Who the fuck gave them permission to list my @float_ui components on their fucking website?????? Yo @sergeybunas and @korablev have 24 hours to remove my components or I will file a lawsuit against you. You should have read the license before doing this shit: github.com/MarsX-dev/floa…
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serafim
serafim@korablev·
Animated shader backgrounds, built with knobs instead of code Pick a pattern, tune the colors and motion, make it react to your cursor, then export it as a drop-in React component All live in your browser. Link in the first comment👇
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serafim
serafim@korablev·
Introducing 21st Bento Manage your profile, add links, components, photos, gifs and more @serafim" target="_blank" rel="nofollow noopener">21st.dev/@serafim
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serafim
serafim@korablev·
We taught our MCP to draw. Search @21st_dev 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 → 21st.dev/api/mcp
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serafim
serafim@korablev·
Every @shadcn theme, in one place. Browse what the community built, preview it live, and ship your own in a couple clicks. Free on @21st_dev.
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serafim
serafim@korablev·
Your @21st_dev profile is now a place to get paid. Feature your best components, add a donation link, let people hire you, and link your pro components + socials. All from one page.
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serafim
serafim@korablev·
I had 14 tabs open just to keep up with AI. arXiv, Papers With Code, every leaderboard, HuggingFace, half a dozen RL-env hubs... So I built one screen for all of it. The Bloomberg terminal for AI research. It's called Sophon 🧵
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serafim
serafim@korablev·
Introducing @21st_dev Agent Elements Diffed edits. Plan approvals. Clarifying questions. Sub-agents. Tool cards. The pieces every "agent UI" lib skips. 25 @shadcn /ui components built for the new generation of agents that use your computer. Open-source. Link in thread 🧵
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serafim
serafim@korablev·
built a Lottie animation generator agent on @21st_dev SDK. → prompt → valid Bodymovin JSON (shape layers, keyframed transforms, bezier paths) → live preview + scrubbable timeline with hover-scrub → copy json or one-click download → thinking banner with live phase hints while the agent writes 100% open-source. you can run it in 60 seconds 🧵
serafim@korablev

built a thread generator agent on @21st_dev SDK. → drafts X threads end-to-end → ray.so-style code blocks, 18 themes → matches your voice from a X handle → OG link previews + inline video cards 100% open-source. you can run it in 60 seconds 🧵

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serafim
serafim@korablev·
built a SQL agent UI with @21st_dev SDK — chat to query OR mutate a live table grid — read/write toggle sits right in the chat input — new rows pulse green when the agent INSERTs — the active tab follows whatever the agent touches under 500 LOC, full template ↓
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atomicbot.ai
atomicbot.ai@atomicbot_ai·
Generate websites with OpenClaw 🦞 Add the @21st_dev MCP in @atomicbot_ai Your agent runs the flow: → Generates UI variants → Picks the best result → Ships it into your desktop project Open-source. Local models supported.
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21st
21st@21st_dev·
Introducing Agent Registry for Anthropic Managed Agents
serafim@korablev

Introducing Agent Registry for Anthropic Managed Agents on @21st_dev Find the right config in seconds: → Semantic search - describe what you need, not keywords → Browse by MCP server - Slack, GitHub, Postgres, Sentry… → Filter by category - coding, devops, research, data, monitoring → Copy-ready - Prompt, CLI, YAML, JSON, TS, Python Stop building from scratch. Someone already made it.

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serafim
serafim@korablev·
1,030 people used 21st.dev in the last 30 minutes. If you’re one of them, say hi in the comments 👋
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serafim
serafim@korablev·
Your docs agent should not stop at “not found in docs.” So I turned our docs template into a simple support agent. If the docs cannot answer, the agent forwards the question to your team by email. Built with Claude Code + 21st SDK + @resend Takes just a few minutes to add. Demo below 👇
serafim@korablev

Stop sending users to a docs tab. Let them chat with docs inside your product. - Built with Claude Code + @21st_dev SDK - Works especially well with @mintlify - Setup takes ~2 minutes. Demo below 👇

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serafim
serafim@korablev·
Stop sending users to a docs tab. Let them chat with docs inside your product. - Built with Claude Code + @21st_dev SDK - Works especially well with @mintlify - Setup takes ~2 minutes. Demo below 👇
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serafim
serafim@korablev·
We had no idea when engineers from OpenAI or Stripe signed up. So we built a lead research agent. Claude Code + @ExaAILabs researches each signup by email and pings Slack when someone interesting appears. Template on 21st 👇
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serafim
serafim@korablev·
Big update: 21st SDK x @OpenRouter 🤝 Now you can keep runtime: "claude-code" and run your agents on OpenAI / Gemeni models via OpenRouter model IDs. Same Claude Code-style workflow. More model choice. 🧵
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Keşfet

@float_ui @sergeybunas @korablev @shadcn @atomicbot_ai @resend @mintlify @ExaAILabs