YC W12

28 dead or acquired startups from batch W12 with completed research reports.

Every startup playbook in our database, ready to build

Each deep-dive includes a post-mortem, step-by-step rebuild plan, and a technical spec you can paste straight into Claude Code, Cursor, or Lovable.

W12

Acquired

42Floors
Real Estate
We make it easy to search for office space.

99dresses

Women's Health
We're creating every women's fantasy by combining the unwanted…

Ark

Media
Ark organizes the world's social information.

BarSense

Kids
Kid's first smartphone with web-based parental controls.

BookSolid

Marketplace
BookSolid is the opentable for tour operators.

Brace

No-code
Backlift allows front-end only developers to build entire websites…

Carsabi

Automotive
Carsabi is the search engine for used cars

Couple

Messaging
App that connects two phones and creates a private timeline to share…

Documents.Me

Security
Client-side encryption for your devices and the cloud.

Acquired

FarmLogs
Analytics
Software that helps farmers operate more profitable businesses.

Flutter

Computer Vision
Flutter combined computer vision technology with the built-in webcams…

GiveSpark

Nonprofit
Givespark was a celebrity charity fundraising platform

Grouper

Dating
We set up drinks between 2 groups of friends: 3 guys and 3 girls.

Hipmob

Customer Service
Customer communication for iOS and Android developers - an in-app…

Acquired

LendUp
Fintech
LendUp is a socially responsible company on a mission to redefine…

Loom

Video
Cloud storage for photos and videos (acquired by Dropbox).

LVL6

Gaming
We make mobile MMOs.

Acquired

Make School
Education
Make School is redesigning college for the 21st century. Students…

Marft

Developer Tools
Marft creates embeddable machine learning models for application…

Minefold

Gaming
Simple multiplayer game servers.

Optilly/Installmonetizer

Marketing
Fb ad optimization platform

Acquired

Pixelapse
Design
Github for designers. We automatically keep track of revisions of…

SolidStage

DevOps
Sysadmin as a service. We make deploying, configuring, monitoring,…

Talkray (TiKL)

Messaging
Instantly talk or text to one or a group of friends at once with the…

Acquired

The Muse
Marketplace
The Muse is values-based job search & hiring for 7M+ monthly

WireOver

Security
Really secure file sending for big files.

Zillabyte

Analytics
Palantir for sales people

Zipio

Marketplace
Deal search service