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21st | YC Companies Directory

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21st

Product design and prototyping tool for AI native teams

Batch

Winter 2026

Status

Active

Industry

B2B

B2B -> Engineering, Product and Design

Location

San Francisco

US

Team size

3

Website

YC profile

Tags

developer toolsb2bdesign tools

External links

LinkedIn Twitter GitHub

YC notes

Group partner: {"full_name":"Ankit Gupta","id":224910,"url":"https://www.ycombinator.com/people/ankit-gupta"}

Founders: Serafim Korablev, Sergey Bunas