companies / 21st-dev
Generated UTC · publication cutoff 2026-11-09
Insufficient cited evidence for a two-sentence summary.
verified=2026-09-27 json
| total_raised | 1,000,0001.0M (derived) | derived |
|---|---|---|
| founded | 2025 | |
| hq | United States | |
| industry | unknown | |
| stage | seed |
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.
No cited completed company acquisition recorded.
Dated disclosures. Customer relationships and classifications are historical; ARR is separate from revenue.
No cited disclosure recorded: named customer, disclosed revenue, ARR, count, B2B / B2C, sector, go-to-market.
No cited valuation with an explicit basis is recorded.
Historical post-money / actual annual or stated TTM revenue. Same currency; economic valuation date within 90 days of revenue period end, inclusive. No FX, ARR, annualized revenue, estimates or projections. Conflicts and ambiguous ties are withheld.
No qualifying pair recorded.
| date | type | amount | lead | src |
|---|---|---|---|---|
| 2026-01-01 | seed | 1,000,0001.0M | null | ○ |
| person | role | src |
|---|---|---|
| Serafim Korablev | ceo | YC |
| Serafim Korablev | founder | YC |
| Sergey Bunas | founder | YC |
Vercel, Google Tag Manager, core-js, Vercel Speed Insights, Next.js, React, Webpack, @sentry/browser, posthog-js
| fact | status | src |
|---|---|---|
| Seed, $1.0M | attributed | ○ |
| total | derived: Stated total is below the largest recorded round; sum of recorded rounds used | derived |
| existence | sourced | YC |
| description | self-reported | WEB |
| date | fact | change | src |
|---|---|---|---|
| 2026-09-28provenance_total: unknown → derived, derived 2026-09-27 | provenance_total | unknown → derived | derived 2026-09-27 |
| 2026-09-28total_raised: 500000 → 1000000, derived 2026-09-27 | total_raised | 500000 → 1000000 | derived 2026-09-27 |
| 2026-09-24provenance_existence: self-reported → sourced, YC 2026-09-17 | provenance_existence | self-reported → sourced | YC 2026-09-17 |
Records begin 2026-09-24. all_changes