YC S21

15 dead or acquired startups from batch S21 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.

Industry: Developer Tools
Description: Your Customer Success Co-Pilot

Industry: Entertainment
Description: A video subscription platform serving black viewers and creators.

Industry: AI-Enhanced Learning
Description: Automatic voice-of-customer trends & metrics from sales conversations.

Industry: Marketplace
Description: Online convenience stores fulfilled by tiny, automated dark stores.

Industry: E-commerce
Description: Pinduoduo for India

Industry: Fintech
Description: Fast and simple fintech financing

Industry: Artificial Intelligence
Description: AI-Powered Assistant for Procurement and Strategic Sourcing

Industry: SaaS
Description: Mindmesh is the virtual desk that puts you in control.

Industry: Construction
Description: Revolutionizing digital selling within HVAC

Industry: SaaS
Description: AI phone calls for the US healthcare industry

Industry: SaaS
Description: A modern platform for content marketing & SEO.

Industry: Community
Description: Audio career advice

Industry: Artificial Intelligence
Description: Never code alone.

Industry: Security
Description: Automate your cyber security risk assessments

Industry: SaaS
Description: We are Shopify for the $15B creator economy in LATAM