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21st Logo
21st Growth Score
91
CB Rank
31228
Heat Score
83
21st dev provides an open-source platform for discovering, sharing, and generating reusable React UI tools for frontend development.
Founded
obfuscation
PrivateSeed San Francisco, California, United States1-10 21st.dev
Artificial Intelligence (AI)
Developer Tools
Information Technology
Overview

21st
Total Funding
obfuscation
Growth Score
91
Heat Score
83

Total Funding
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Seed raised
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Growth Score91
-2 pts
in past quarter
Heat Score 83
32 pts
in past quarter

Company Performance Metrics

Score
Trend
AI Content may contain mistakes and is not legal, financial or investment advice.Learn more.
Growth Score - The measure of growth based on company activity, operational metrics, and investments
Growth Trend - The change in the growth score over the given time period
Heat Score - The measure of the market interest, media activity, and Crunchbase profile activity
Heat Trend - The change in the heat score over the given time period
Learn More >
Recent Milestones
Raised Funding Round
Jan 1, 1970
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Raised Funding Round
Jan 1, 1970
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Raised Funding Round
Jan 1, 1970
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See more interactive data and historical milestones on desktop for the best experience

About 21st

CB Rank
31228
21st dev provides an open-source platform for discovering, sharing, and generating reusable React UI tools for frontend development.
Founded
obfuscation
PrivateSeed San Francisco, California, United States1-10 21st.dev
Artificial Intelligence (AI)
Developer Tools
Information Technology

Funding Rounds

Seed
OBF
in
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Pre-Seed
OBF
in
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Key People

Details

Legal Name 21st Labs Inc.
Also Known As 21st.dev
Operating Status Active
Company Type For Profit
Founders  Eyas Kelani, Serafim Korablev, Sergey Bunas
Predictions & Insights

Growth Prediction

See this Growth Prediction
Top Contributing Factors
Runway Speculation

Products & Services

21st.dev UI Component Platform
A platform for discovering, sharing, and remixing UI components designed for AI agents and developers.

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  • Track market signals on competitors, products, and R&D
  • Preview private company insights and predictions
Financials

Company Funding

Total Funding Amount 
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Number of Funding Rounds 2
Unlock company funding data, including rounds, dates, amounts, and investors.
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Transaction Name  
Number of Investors  
Money Raised  
Lead Investors  
Funding Type  
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Seed Round - 21st Logo
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4
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Y CombinatorSeed

Funding Rounds

Total Funding Amount 
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Number of Funding Rounds 2
Unlock company funding data, including rounds, dates, amounts, and investors.
Announced Date  
Transaction Name  
Number of Investors  
Money Raised  
Lead Investors  
Funding Type  
obfuscation
Seed Round - 21st Logo
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4
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Investors

Unlock company funding data, including rounds, dates, amounts, and investors.
Investor Name  
Lead Investor  
Funding Round  
Partners  
Hustle Fund Logo
Hustle Fund
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Market Intelligence
People
View Profiles & Contacts
Headcount 1-10 Employee Profiles 2 Contacts 1

Employee Profiles

News

News and Press

News•Aug 11, 2025
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News•Mar 20, 2025
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News•Feb 11, 2025
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Access a complete feed of recent news and press, from product launches to leadership changes.
Technology
View Tech Report

Monthly Web Visits

2,312,075
170.08%
 in past month

Active Website Tech Count

2921st is actively using 29 technologies for its website, according to BuiltWith. These include Viewport Meta, IPhone / Mobile Compatible, and  HSTS.
Sub-Organizations
Frequently Asked Questions

Where is 21st's headquarters? 21st is located in San Francisco, California, United States.Who invested in 21st? 21st has 5 investors including Hustle Fund and  Pioneer Fund.When was the last funding round for 21st? 21st closed its last funding round on
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from a Seed round.Who are 21st's competitors? Alternatives and possible competitors to 21st may include Bit, NextUI, and  MUI.How much funding has 21st raised to date? 21st has raised
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.
Who We Are
What We Do
Helpful Links
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