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 |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
Request accessFrequently Asked Questions
Common questions about 21st.dev's valuation, stock price, and market status.
Is 21st.dev a public or private company?
21st.dev is a private company.
What is the current stock price of 21st.dev?
21st.dev is a private company, so its shares have no public market price. Caplight tracks 21st.dev's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is 21st.dev worth (valuation)?
Valuation information for 21st.dev is not publicly available.
Can I buy 21st.dev stock?
21st.dev shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was 21st.dev's last funding round?
21st.dev's most recent funding round was Accelerator on March 16, 2026.
Who are the main investors in 21st.dev?
Key investors in 21st.dev include Y Combinator.
Will 21st.dev IPO soon?
No public IPO plans have been announced for 21st.dev.
How can I track 21st.dev secondary market activity?
Caplight tracks bids, offers, and trades in 21st.dev's shares on secondary markets.