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21st.dev

@21st_dev_old

UI infrastructure for the AI era of coding

 London, UK
21st.dev
Joined December 2022
  • Tweets889
  • Following1
  • Followers2.4K
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21st Agents - Claude Code SDK is React. We’re building Next.js.

21st Agents - Claude Code SDK is React. We’re building Next.js.

Article · @sergeybunas
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serafim (@korablev) profile picture
serafim
@korablevMar 4
21st Agents is now in Public Beta. The infra layer to ship Claude Code & Codex agents inside your product. In minutes. Comment for free credits to try 🧵
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best open-source UI for claude code now has 5k STARS
Image from sergey bunas (@sergeybunas)
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serafim (@korablev) profile picture
serafim
@korablev15 Oct 2025
The best products of the 21st century have yet to be shipped. With 21st, any idea can find its aesthetic and design, even if you aren’t a designer. Meet the first vibe crafting tool for everyone…. So every product can have soul.
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Just had a meeting w @sergeybunas from the 21st.dev team. One of the most awesome products i've tried that really 10x my workflow to craft beautiful UI. If you havent, go test out their MCP, they are working hard in some mindblowing new features!
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serafim (@korablev) profile picture
serafim
@korablev21 Jul 2025
Magic MCP isn’t great for exploring design options visually. With @21st_dev team, we’re building something new - a place to save real examples, test multiple ideas side-by-side, and easily preview UI. What do you think?
Image from serafim (@korablev)
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serafim (@korablev) profile picture
serafim
@korablev20 Jul 2025
Remember when I said “A true game changer just landed on 21st[.]dev”? This is it: → Paste a URL → Copy the full site UI It’s live. It’s scary fast. Go break the internet.
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I built this landing page for my voice dictation software @cliovoice under 3 hours using @21st_dev last night with @AnthropicAI Claude Code! Generated some of the images with ChatGPT. Really happy with how it turns out. Launching Clio Voice tomorrow!
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serafim (@korablev) profile picture
serafim
@korablev8 Jul 2025
Today we are launching on Product Hunt with 21st.dev 2.0 → Magic AI Component Generations → Remix any component with AI → Vs Code Extention Support us now! Link in first comment
Image from serafim (@korablev)
Image from serafim (@korablev)
Image from serafim (@korablev)
Image from serafim (@korablev)
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serafim (@korablev) profile picture
serafim
@korablev4 Jul 2025
Excited to be judging the World’s Largest Hackathon with @boltdotnew & @Devpost! ⚡️ Pure chaos, energy — and vibecoding at its peak It’s not about frameworks or boilerplate anymore It’s about shipping fast, making it beautiful, and feeling the flow That’s exactly what we believe in at @21st_dev The future is vibe-coded bit.ly/3SfWl1A #worldslargesthackathon
World’s Largest Hackathon presented by Bolt

World’s Largest Hackathon presented by Bolt

Build with AI for a shot at some of the $1M+ in prizes.

worldslargesthackathon.devpost.com
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Have been working on UI for altcoinquest.online today. Here is a short preview of what we have been building for the @boltdotnew World’s Largest Hackathon! @21st_dev makes UI building fun Shoutout to @inkko44 for the @screenstudio & @SuperMotionCo suggestions! #worldslargesthackathon #bolthackathon #altcoinquest
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with the GOAT himself @antonosika @21st_dev 🤝 @lovable
Image from sergey bunas (@sergeybunas)
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bv (@bv_codes) profile picture
bv@bv_codes27 Jun 2025
Just tried Magic Chat by @21st_dev. Gave it just one prompt for a SaaS hero section and boom 💥 🎨 6 design variants 📱All mobile-ready 💬You can even chat with each version to make edits AI + UI is next-level! #buildinpublic #UIDesign #AITools
Image from bv (@bv_codes)
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Replying to @jeff_weinstein
@21st_dev 's 21st.dev/magic all day.
21st AI — Generate UI components in variants

21st AI — Generate UI components in variants

Describe the UI you need and draft it with 21st AI. Compare takes, iterate, and bring the prompt or code into your project through the web, MCP, or CLI. Formerly known as Magic Chat.

21st.dev
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JK (@jungkeunhong) profile picture
JK
@jungkeunhong24 Jun 2025
Day 7: build in public + post on X every day today I: - improved system prompt and ui - did 2 blog posts - made new landing page (TY @21st_dev) today’s result: - 6 leads - 120 visitors yes, surprisingly low week goal is warming up more virals 🚀
Image from JK (@jungkeunhong)
Image from JK (@jungkeunhong)
Image from JK (@jungkeunhong)
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Creating components with @cursor_ai and @21st_dev's MCP is so fun... I might be addicted.
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Day 18 of the @boltdotnew hackathon. The landing page looks neat -> presenting in dark mode (1.5x speed) - Veo3 made lovely hero video - @21st_dev helped with AI magic, How it works and Testimonials
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AI Design Variants: One prompt. Multiple designs. Try Magic Chat by @21st_dev You get 6 design component variants for every prompt. No more settling for the first (usually boring) result. teapawt.net/nocheerleader/status/1…
Ciara Wearen (@nocheerleader) profile pictureCiara Wearen
@nocheerleader7 Jun 2025
Ship a beautiful UI with one prompt: - go to @21st_dev Magic Chat - give it one simple prompt 👇 - get 6 variations to choose from - they're mobile responsive by default - copy/paste the code into @boltdotnew - watch it build pixel-perfect UI
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🤯 you can attach @21st_dev components as inspirations in magic-chat
Image from sergey bunas (@sergeybunas)
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Magic MCP 0️⃣.1️⃣.0️⃣ is here 2x faster generations 2.5x better generations chat with your component access to previous generations check it out ⬇️
Image from sergey bunas (@sergeybunas)
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