# 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