HomeCompaniesProfile

21st

Infrastructure and UI building blocks for the agentic internet 

Company Size

1 - 5 employees

Year Founded

2024

About 21st

21st.dev is the largest React component registry for AI applications, used by 2M developers (370K MAU).
We provide the building blocks to create AI agents and agent-powered apps: UI components, agent templates, and an SDK with built-in UI, tools, memory, observability, and managed infrastructure.

Latest Jobs

Founders & Key People

Sergey Bunas

Sergey Bunas

Founder, 21st

Serafim Korablev

Serafim Korablev

CEO / co-founder, 21st

Share This Profile

More Companies

Pine Park Health

We provide primary care in senior living communities.

Novaflow

The AI data analyst for biology labs

Albedo

Full-stack VLEO satellite missions

Trata

AI-powered research desk for hedge funds

ShortLoop

Phone AI that Captures Every Dealership Revenue Opportunity

BEAMSTART

BEAMSTART is a global entrepreneurship community, serving as a catalyst for innovation and collaboration. With a mission to empower entrepreneurs, we offer exclusive deals with savings totaling over $1,000,000, curated news, events, and a vast investor database. Through our portal, we aim to foster a supportive ecosystem where like-minded individuals can connect and create opportunities for growth and success.

Connect with Us

Discover More

© Copyright 2026 BEAMSTART. All Rights Reserved.