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.
Public company, workplace, funding, and market signals
Updated Jul 29, 2026
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
0 jobs at 1code (21st.dev)
Check back later for new openings
Business model
Stage
Seed
Total raised
$500K
Latest round
Seed · Jan 2026
Latest amount
$500K
Jan 2026 · Y Combinator
Investors
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
Pricing
Freemium marketplace/catalog with paid membership tiers (Builder, Builder + AI, Team) and subscription-gated 1Code cloud features.
Differentiators
Technology
Customers
Competitors
Estimated revenue
≈$93K–$430K estimated annual revenue (midpoint about $226K)
Estimated monthly visits
778.4K
Traffic estimate as of Jan 2026
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.
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.