21st
Last verified 2026-05-16. JSON
The funding figures on this page are attributed, not sourced: a publisher is on record but no document URL is. How we mark provenance.
| Total raised | $500,000attributed |
|---|---|
| Latest round | seed, $1.0M, 2026-01-01attributed |
| Founded | 2025 |
| Headquarters | United States |
| Industry | ai |
| Stage | seed |
| Website | 21st.dev |
21st is a marketplace of community-made, reusable UI components for web developers. It serves front-end engineers and designers who want ready-made interface building blocks. The library spans specialized categories such as AI chat components, shaders, and hero sections, all contributed by its community.
Funding rounds
| Date | Round | Amount | Lead |
|---|---|---|---|
| 2026-01-01 | seed | $1.0M | undisclosed |
Detected tech stack
Vercel, Google Tag Manager, core-js, Vercel Speed Insights, Next.js, React, Webpack, @sentry/browser, posthog-js
Provenance
| Fact | Status | Basis |
|---|---|---|
| Seed, $1.0M | attributed | yc named as publisher. No document URL on file. |
| Total raised $500,000 | attributed | yc named as publisher. No document URL on file. |
| Company existence | sourced | Y Combinator named as publisher. Document, retrieved 2026-09-17. |
| Description | self-reported | 21st.dev, read 2026-05-16 |
Change history
| Date | Fact | Change | Basis |
|---|---|---|---|
| 2026-09-24Existence: self-reported → sourced, Y Combinator, document, retrieved 2026-09-17 | Existence | self-reported → sourced | Y Combinator, document, retrieved 2026-09-17 |
Records begin 2026-09-24. All changes