# YC W21

6 dead or acquired startups from batch W21 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.

### Avenue

**Developer Tools**  
Observability platform for operations teams

### Fable

**SaaS**  
The command center for product teams

### Fountain9

**Artificial Intelligence**  
Helping food brands and retailers reduce food wastage

### Noble

**Fintech**  
Risk decisioning platform

### Playmaker

**Sports Tech**  
Community for fantasy sports players

### Queenly

**Marketplace**  
Leading marketplace for formalwear