21st

21st YC 申请

Winter 2026Active

21st 在 Winter 2026 批次的 Y Combinator 中作为一家 B2B 公司进行过。以下是:公司做什么、谁创立了它,以及其 YC 申请,按照真实 YC 表格逐题重建。

YC 批次
Winter 2026
行业
B2BEngineering, Product and Design
团队规模
3
状态
Active
已发布
2025

创始人

  • Serafim Korablev
    Serafim KorablevCEO / co-founder
  • Sergey Bunas
    Sergey BunasFounder

21st 做什么

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.

21st 的 YC 申请,重建版

Y Combinator 申请

21st,Winter 2026 期。来自公开数据的真实申请问题解答。

  1. Founders2
  2. Company7
  3. Progress7
  4. Idea4
  5. Equity3
  6. Curious2
  7. Batch Preference1

Company

Company name

21st

Describe what your company does in 50 characters or less.

Infrastructure and UI blocks for agentic internet

What is your company going to make? Please describe your product and what it does or will do.

We're building 21st.dev, the largest React component registry tailored for AI applications. Our product includes UI components, agent templates, and an SDK that bundles UI, memory, tools, observability, and managed infrastructure. This makes it easier for developers to build AI agents and agent-powered apps without reinventing the core pieces.

Where do you live now, and where would the company be based after YC?

We live and work in San Francisco, CA, and the company will remain based here after YC.

Explain your decision regarding location.

San Francisco is where our team lives and the natural ecosystem for AI infrastructure startups. Staying here lets us tap into local engineers, early users, and investor networks.

21 更多回答 在完整申请中

Founders, Progress, Idea, Equity, Curious, Batch Preference 包含在完整版中。创建免费账户即可在 YC Insights 中打开,紧邻每个其他 YC 批次。

常见问题解答

这是 21st 的真实 YC 申请吗?

不是。Y Combinator 对提交的申请保密。这是重建版:使用 21st 的公开数据(发布笔记、创始人背景、产品描述)回答真实的 YC 表格问题。它展示了像 21st 这样的公司会如何向 YC 自我介绍,而不是他们提交的文本。

21st 是哪个 YC 批次的?

21st 是 Y Combinator Winter 2026 批次的成员。

谁创立了 21st?

21st 由 Serafim Korablev, Sergey Bunas 创立。

21st 做什么?

Infrastructure and UI building blocks for the agentic internet

如何阅读完整的重建申请?

创建免费的 Round Funded 账户。YC Insights 中包含 21st 的完整 26 个问题的版本,以及其他所有 YC 批次的公司信息。

更多 YC 初创公司,例如 21st