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.

Developer Tools
Observability platform for operations teams

SaaS
The command center for product teams

Artificial Intelligence
Helping food brands and retailers reduce food wastage

Fintech
Risk decisioning platform

Sports Tech
Community for fantasy sports players

Marketplace
Leading marketplace for formalwear