21st blog · Jul 2026
Official launch post for the rebuilt CLI and MCP workflow, showing 21st can be driven from editors and agents to search, install, generate, and publish components.
Company research
Public company, workplace, funding, and market signals
Updated Jul 29, 2026
Overview
21st Labs Inc. (21st / 21st.dev) runs a community-driven React UI catalog for AI-era products and an adjacent agent infrastructure stack, including 1Code, an open-source desktop client/orchestration layer for coding agents.
Primary product
AI-ready React component marketplace/registry for developers, plus 1Code for coding-agent orchestration
Founded
2025
Headquarters
San Francisco, California, United States
Team size
1-10 employees
Work style
Onsite
Industry
IT System Custom Software Development
Sub-industry
AI developer tools; React component marketplace and agent infrastructure
Offices
San Francisco, California (HQ)
1023 3rd St, San Francisco, CA 94158
Business model
Marketplace/catalog
Freemium
Subscription
Open-source software
Usage-based AI credits
Funding
Stage
Seed
Total raised
$500K
Latest round
Seed · Jan 2026
Latest amount
$500K
Jan 2026 · Y Combinator
People & investors
Work & culture
Small, low-ego, fast-moving team that ships quickly, works in-person in San Francisco, and emphasizes direct access to founders.
Work style
Onsite
Compensation
Public role postings signal competitive salary, meaningful equity, and uncapped commission for a founding GTM role (listed at $150k-$250k/year). An intern posting also offered paid SF housing/room included. No public visa-sponsorship policy was found.
Benefits
Medical, dental, and vision insurance (public job posting signal)
Meaningful equity (public job posting signal)
Uncapped commission for GTM roles (public job posting signal)
Room included for SF intern role (public job posting signal)
Product & market
Pricing
Freemium marketplace/catalog with paid membership tiers (Builder, Builder + AI, Team) and subscription-gated 1Code cloud features.
Differentiators
- —Copy-paste-first components that land in the user's codebase instead of a dependency
- —AI-ready prompts and integration paths for agent tools
- —Large community catalog with authored components and templates
- —MCP and CLI surfaces for install/generate/publish workflows
- —Agent infrastructure products that extend beyond UI into sandboxing, streaming, and observability
- —Open-source 1Code desktop client for coding-agent orchestration
Technology
TypeScript
JavaScript
React
Next.js
Node.js
Python
Electron
MCP
CLI
E2B
shadcn/ui
Tailwind CSS
Radix UI
Vercel AI SDK
Supabase
Clerk
Stripe
Sentry
Langfuse
Resend
Customers
Frontend engineers
Design engineers
Product teams and founders
Developers building AI apps and agents
Agencies
Teams using Cursor, Claude Code, v0, Lovable, or similar tools
Competitors
shadcn/ui
Magic UI
Aceternity UI
v0
Lovable
Cursor
Bolt
Replit
Scale & contact
Estimated revenue
≈$93K–$430K estimated annual revenue (midpoint about $226K)
Estimated monthly visits
778.4K
Traffic estimate as of Jan 2026
Latest news
21st blog · Jul 2026
Launch post for 21st AI, which fans out a brief to multiple models in parallel so users can compare design takes and keep the best one.
21st blog · Jul 2026
Introduces MCP Apps, returning interactive UI cards in chat instead of plain text listings, powered through the 21st MCP endpoint.
21st blog · Apr 2026
Launches a marketplace for Anthropic Managed Agent configurations, extending 21st from UI components into agent templates and discovery.
Silicon Valley Post · Mar 2026
External coverage of the 21st Agents SDK launch, framing 21st as an infrastructure layer for shipping frontier AI agents with sandboxing, streaming, billing, and observability.
Jobs and careers at 1code (21st.dev)
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