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@21st_dev (YC W26)

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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 🧵

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 🧵

83,351 views

Overengineered the hell out of project selection. Absolutely useless for a startup. Zero regrets. I love it.

Overengineered the hell out of project selection. Absolutely useless for a startup. Zero regrets. I love it.

17,006 views

Finding sleek shadcn /ui-style components for v0 just got way easier 🖤 🔥 Browse killer components on (shoutout to Manu Arora for these gems) ⚡ Hit ‘Open in v0’ 🤖 Tell the AI how to drop it into your app Big thanks to Lee Robinson & Guillermo Rauch for the integration assist!

Finding sleek shadcn /ui-style components for v0 just got way easier 🖤 🔥 Browse killer components on (shoutout to Manu Arora for these gems) ⚡ Hit ‘Open in v0’ 🤖 Tell the AI how to drop it into your app Big thanks to Lee Robinson & Guillermo Rauch for the integration assist!

13,843 views

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As a visual person, I hate working in the CLI. But after using Claude Code a few times, it’s impossible to go back. The problem isn’t Claude. It’s the interface around it. So we built the best Claude Code client we could imagine. Runs fully in the browser. Parallel branches and projects. Live previews for every change. A calm, clean UI. Free to use with your own Claude keys. Reply if you want early access 👀

As a visual person, I hate working in the CLI. But after using Claude Code a few times, it’s impossible to go back. The problem isn’t Claude. It’s the interface around it. So we built the best Claude Code client we could imagine. Runs fully in the browser. Parallel branches and projects. Live previews for every change. A calm, clean UI. Free to use with your own Claude keys. Reply if you want early access 👀

251,056 views • 5 months ago

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.

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.

224,043 views • 7 months ago

Introducing 1Code Open source Cursor-like UI for Claude Code. 🧵

Introducing 1Code Open source Cursor-like UI for Claude Code. 🧵

135,456 views • 4 months ago

Introducing 21st 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 🧵

Introducing 21st 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 🧵

41,784 views • 1 month ago

What if your Claude Code client worked beautifully on mobile? Same calm UI. Multiple branches. Live previews. And the ability to keep working without your laptop. Free to use with your own Claude subscription Reply if you want early access

What if your Claude Code client worked beautifully on mobile? Same calm UI. Multiple branches. Live previews. And the ability to keep working without your laptop. Free to use with your own Claude subscription Reply if you want early access

49,981 views • 5 months ago

We're launching 21st Agents in beta. It's the infrastructure layer for Claude Agent SDK - runtime, sandboxing, billing, UI, streaming - so you can ship agents to production without building infra from scratch. Think Vercel for Claude Agent SDK. Full walkthrough in the video below 👇

We're launching 21st Agents in beta. It's the infrastructure layer for Claude Agent SDK - runtime, sandboxing, billing, UI, streaming - so you can ship agents to production without building infra from scratch. Think Vercel for Claude Agent SDK. Full walkthrough in the video below 👇

22,443 views • 2 months ago

Introducing Agents by 21st (alpha) We love Claude Code. We hate living in the CLI. So we built a calm, visual client for real code work: • works with your own Claude subscription • local work with worktrees + multiple sessions • multiple terminals per worktree • diff viewer, commits, PR control Built for people who think visually.

Introducing Agents by 21st (alpha) We love Claude Code. We hate living in the CLI. So we built a calm, visual client for real code work: • works with your own Claude subscription • local work with worktrees + multiple sessions • multiple terminals per worktree • diff viewer, commits, PR control Built for people who think visually.

29,114 views • 4 months ago

🚨 Introducing Magic 2.0 Alpha by 21st[.]dev 🚨 Now available on Web 🧙‍♂️ ✨ Generate 10 unique components 💬 Iterate & refine in chat 🔁 Copy the perfect prompt & use it in bolt.new The fastest way to go from idea → reusable UI Join waitlist below

🚨 Introducing Magic 2.0 Alpha by 21st[.]dev 🚨 Now available on Web 🧙‍♂️ ✨ Generate 10 unique components 💬 Iterate & refine in chat 🔁 Copy the perfect prompt & use it in bolt.new The fastest way to go from idea → reusable UI Join waitlist below

48,634 views • 1 year ago

We had no idea when engineers from OpenAI or Stripe signed up. So we built a lead research agent. Claude Code + Exa researches each signup by email and pings Slack when someone interesting appears. Template on 21st 👇

We had no idea when engineers from OpenAI or Stripe signed up. So we built a lead research agent. Claude Code + Exa researches each signup by email and pings Slack when someone interesting appears. Template on 21st 👇

11,986 views • 2 months ago

Magic MCP is now live! After 2 weeks in beta with 4k testers, Magic MCP is now publicly available 🔹 Customize default shadcn components effortlessly 🔹 Get inspired by the huge 21st[.]dev library & share 50% revenue with creators 🔹 Find SVG logos instantly Link below ↴

Magic MCP is now live! After 2 weeks in beta with 4k testers, Magic MCP is now publicly available 🔹 Customize default shadcn components effortlessly 🔹 Get inspired by the huge 21st[.]dev library & share 50% revenue with creators 🔹 Find SVG logos instantly Link below ↴

serafim | 21st.dev

45,514 views • 1 year ago

I built the first Claude Code client that works fully offline using local models via ollama Open source. Link below.

I built the first Claude Code client that works fully offline using local models via ollama Open source. Link below.

15,176 views • 4 months ago

21st lets you work on real frontend code in the browser you can iterate on multiple branches and projects in parallel, with live previews it’s my favorite tool for frontend (and yeah, i’m building it using itself) p.s. comment if you want free tokens 👀

21st lets you work on real frontend code in the browser you can iterate on multiple branches and projects in parallel, with live previews it’s my favorite tool for frontend (and yeah, i’m building it using itself) p.s. comment if you want free tokens 👀

13,479 views • 5 months ago

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