RECENT FUNDING
  1. Recent Funding
  2. Companies
  3. 21st

21st

21st dev provides an open-source platform for discovering, sharing, and generating reusable React UI tools for frontend development.

Developer tools and cloudY CombinatorPioneer Fund
Latest funding

$500K*

Source: ycombinator.com

Latest round on record: Series A, February 2026, amount undisclosed.

All 2 rounds ↓
Website: 21st.dev.
X: @21st_dev · 3,692 followers.
LinkedIn: linkedin.com.
Category: Developer tools and cloud.
Sectors: B2B, Engineering, Product and Design.
Stage: Series A.
Based in: San Francisco, United States.
Last round: Feb 11, 2026 · 274 days ago.
Team: 3 people on the team page.
On Recent Funding since: Sep 28, 2026.

Signals

X account@21st_dev · created Oct 1, 2025 (13 months old) · 3,692 followers
Website registeredOct 10, 2024 (2 years old)
TIMELINE · MILESTONES

21st | 489 days from website to first raise on record

@21st_dev·1 round·2 signals before the first raise
NOVMARJULNOVMARJULNOV||WEBSITE CREATED · OCT 10, 2024||X ACCOUNT CREATED @21ST_DEV · OCT 1, 2025Series A · Feb 11, 2026A · FEB '26

One step per dated milestone. Pins are dated signals; hover the icons for dates.

Funding rounds

  1. Series A · amount undisclosed
    Source: fundraisingfox.com
  2. X account created
  3. Website created
  4. Date unknown
    Round · $500K*
    YY Combinator
    Source: ycombinator.com

Founders and team

Investors

Companies like 21st

Sources and API

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/21st (get a free API key).

Top raises, every week

The week's top funded startups and market insights, in your inbox every Monday.

Unsubscribe anytime · privacy