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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
21st.devYC profile
View YC pageTags
developer toolsb2bdesign tools
YC notes
Group partner: {"full_name":"Ankit Gupta","id":224910,"url":"https://www.ycombinator.com/people/ankit-gupta"}
Founders: Serafim Korablev, Sergey Bunas