21st

About

21st.dev is the largest React component registry for AI applications, used by 2M developers (370K MAU). We provide the building blocks to create AI agents and agent-powered apps: UI components, agent templates, and an SDK with built-in UI, tools, memory, observability, and managed infrastructure.

Founders

• 
  Serafim Korablev· CEO / co-founder

  One of the first full-time vibe-coders (since October 2023). Co-founder of 21st.dev, a UI components registry with over 1m users. Previously co-founded Rork.com (then a web app builder for Next.js), the first Telegram-native memecoin launchpad (multi-million exit), and Via, a cross-chain crypto routing protocol with $1.5B GTV backed by Naval, Safe, Sandeep, and others. Passionate about design and basketball.

  LinkedIn ↗Twitter ↗
• 
  Sergey Bunas· Founder

  CS dropout. Senior Software Engineer at Deel (W19). Built Perplexity before Perplexity (Suggesty, 2022 — #1 Product Hunt, featured in Google's internal newsletter). Solo-built a Figma competitor pre-AI (Stage, 10K users). Cambridge AI hackathon winner (solo)

  LinkedIn ↗Twitter ↗

Product launches · 1 launch

• 21st - Infrastructure for AI agents ↗▲ 18Mar 16, 2026

  The production layer for shipping frontier AI agents inside your product - sandboxing, streaming, billing, UI, and observability out of the box.

Change history · none recorded