About Us

21st is the global ecosystem for young builders: a free, curated community of founders, creators, engineers and investors in every sector. We run the rooms, make the introductions, and tell the stories of the people in them. To date, we have hosted over 2800 builders across 45 rooms, in 6 cities.

We are a community of 400+ young founders. 66 universities, 40 cities, 3 continents.

Young builders from everywhere.

How to join

Come to an event. Find one on our calendar and request a spot.

Or come with a friend. If you know someone in 21st, come as their guest.

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

Rooms. Rooftops in Manhattan, hacker houses in San Francisco, private dinners in Seoul, Tokyo and Melbourne. Almost every night, from 12 seats to 300.

Introductions. Direct access to founders who’ve raised $230M+, creators with 75M+ followers, and investors from the top funds. Made one at a time, when it matters.

Perks. $800K+ in perks from Anthropic, Notion, Ramp, Mercury, Brex and more.

All for free.

Network

Builder fields

AI
Consumer
Fintech
Proptech
Fashion
Beauty
Wellness
Creators
Media
Film
Design
Climate
Education
Robotics

Schools

Stanford
Harvard
Yale
Columbia
NYU
Berkeley
UCLA
USC
Parsons
Cambridge
UBC
Monash
Yonsei
66+ in 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 building something

Where we are

NEW YORK · SAN FRANCISCO · TORONTO · SEOUL · TOKYO · MELBOURNE

Anchored in New York, with rooms almost every night.

100+ founders