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YC S21

15 dead or acquired startups from batch S21 with completed research reports.

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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.

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S21
Inactive
Abbot logo

Abbot

Developer Tools

Your Customer Success Co-Pilot

S21
Inactive
BlackOakTV logo

BlackOakTV

Entertainment

A video subscription platform serving black viewers and creators.

S21
Inactive
Buzzle logo

Buzzle

AI-Enhanced Learning

Automatic voice-of-customer trends & metrics from sales conversations.

S21
Inactive
Cache logo

Cache

Marketplace

Online convenience stores fulfilled by tiny, automated dark stores.

S21
Inactive
Gobillion logo

Gobillion

E-commerce

Pinduoduo for India

S21
Acquired
Level logo

Level

Fintech

Fast and simple fintech financing

S21
Acquired
Mentum logo

Mentum

Artificial Intelligence

AI-Powered Assistant for Procurement and Strategic Sourcing

S21
Inactive
Mindmesh logo

Mindmesh

SaaS

Mindmesh is the virtual desk that puts you in control.

S21
Inactive
Onsite Pro logo

Onsite Pro

Construction

Revolutionizing digital selling within HVAC

S21
Inactive
Opkit logo

Opkit

SaaS

AI phone calls for the US healthcare industry

S21
Acquired
Positional logo

Positional

SaaS

A modern platform for content marketing & SEO.

S21
Inactive
Quest logo

Quest

Community

Audio career advice

S21
Inactive
Squire.ai logo

Squire.ai

Artificial Intelligence

Never code alone.

S21
Acquired
Telivy logo

Telivy

Security

Automate your cyber security risk assessments

S21
Inactive
Wabi logo

Wabi

SaaS

We are Shopify for the $15B creator economy in LATAM

Startups.RIP — Dead startups, alive ideas
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