About

21ST is for anyone trying to build something real between classes, part-time jobs, and late nights. We bring young founders into the same room — and into the same directory — so the right intro is easier to find.

The network started with a simple belief: builders move faster when they can find people who understand the weird early stage. Stanford, Harvard, Yale, Cambridge, and 40+ schools are already represented — but the school matters less than the fact that everyone is making something.

Across 40+ schools

Why it exists

When you need advice, a cofounder, an operator intro, or just someone who understands what it feels like to build before you’re supposed to be ready, 21ST is the place to look. Events are coming; the directory, intros, and people are already here.

What we do

Founder dinners
Campus meetups
Curated intros
Member directory
Office hours
Cofounder circles
AI builder salons
Consumer founder tables
Fintech conversations
Peer feedback
Late-night build sessions
Community notes

Network

Builder fields

Fintech

Consumer

Communities

Climate

Creator tools

Education

Yogurt, somehow

Schools

Stanford

Harvard

Yale

Cambridge

Berkeley

Columbia

NYU

Waterloo

UCLA

USC

40+ total

Built for

First-time founders

Student operators

Technical builders

Consumer obsessives

AI experimenters

Fintech hackers

Community starters

Solo founders

Cofounder seekers

People still figuring it out

Late-night builders

Early believers

Campus connectors

Future operators

Anyone making something

Members

100+ founders

Across 40+ schools

Warm intros

When you need one

Events

Coming soon

Upcoming events

Founders Between Classes