21st.dev
PrivateLast Round
Accelerator
Mar 16, 2026
Total Funding Raised
$1M
Momentum
Top 25%
of companies Caplight tracks
Company Overview
21st.dev is a software development applications company that provides an infrastructure and UI component registry for building and deploying AI agents.
Sector
Enterprise Software
Verticals
DevOps & Containers, Low-Code/No-Code
Business Model
B2B
Customer Profile
Subscription SaaS, Freemium
AI Layer
Application
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
21st.dev Comparables
Compare 21st.dev with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Vercel | 70% | |
| StackBlitz | 64% | |
| Thesys | 56% |
21st.dev Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Accelerator | Mar 16, 2026 | ||||
| Accelerator | Jan 1, 2026 |
21st.dev Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Pioneer Fund | Accelerator |
| Transpose Platform Management | Accelerator |
| Aloniq | Accelerator |
| AAL VC | Accelerator |
| Y Combinator | Accelerator |
| Hustle Fund | Accelerator |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 18, 2026
Monthly visitors increased 123% MoM, reaching 1.7 million.
- Mar 16, 2026
$500K round led by Y Combinator.
21st.dev Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
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