Application YC di 21st

Winter 2026Active

21st ha partecipato a Y Combinator nel batch Winter 2026 come azienda B2B. Sotto: cosa fa l'azienda, chi l'ha fondata e la sua application a YC, ricostruita domanda per domanda nel form reale di YC.

Batch YC: Winter 2026
Settore: B2BEngineering, Product and Design
Dimensione team: 3
Stato: Active
Lanciata: 2025

Founder

Serafim KorablevCEO / co-founder
Sergey BunasFounder

Cosa fa 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.

Application YC di 21st, ricostruita

Domanda per Y Combinator

21st, batch Winter 2026. Le vere domande del form, risposte da dati pubblici.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
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 risposte in più nell'application completa

Founders, Progress, Idea, Equity, Curious, Batch Preference sono nella versione completa. Crea un account gratuito per aprirla in YC Insights, accanto a ogni altro batch YC.

Vedi domanda completa

Domande Frequenti

Questa è l'application YC reale di 21st?

No. Y Combinator mantiene private le application inviate. Questa è una ricostruzione: le domande del form YC reale, a cui si è risposto usando i dati pubblici di 21st (note di lancio, background dei founder, descrizione del prodotto). Mostra come un'azienda come 21st si presenterebbe a YC, non il testo che hanno inviato.