Startups die.
Ideas don't.

Every failed startup is a lesson for founders.

Deeply researched retros and rebuild playbooks.

Covering 1,886+ YC startups from 2005 to today

Featured Companies

Loopt

Loopt, based in Silicon-Valley and backed by leading venture capital firms Sequoia Capital and New Enterprise Associates, has created an interoperable social-mapping service that allows individuals to use their location to discover the real world around them – enabling them to find and enjoy the people, places, and events that mean the most right here and now using their mobile phones. With Loopt, individuals will always know who’s around, what to do, or where to go

Auctomatic

Auctomatic, a Y Combinator company, offers an auction and marketplace management system for all of those individual sellers on such sites as Ebay, Amazon, Overstock and others. The application lets you list your items as well as manage your sales, but it also helps you understand how to best optimize your selling and maximize profits. The company also received an investment from Paul Buchheit, the lead developer of Gmail.

Heysan

Free messaging on mobile phones

BackType

BackType was an analytics company acquired by Twitter in 2011

Posterous

Dead simple blogs by email

Bump

Bump, Flock, Photoroll (unreleased) => Google Photos

Creative Market

Marketplace for graphic design assets

Optimizely

The first all-in-one operating system for marketing

FutureAdvisor

The online financial management service for everyone.

Perfect Audience

Self-service display advertising for SaaS and online retail.

Clever

The platform that powers technology in the classroom.

Triplebyte

Intelligent technical hiring.

Escher Reality

Developer Tools

The backend for Augmented Reality.

Reverie Labs

AI-powered Drug Discovery

Engineering next-generation, brain-penetrant cancer therapies.

Pincites

Artificial Intelligence

Close deals faster with AI for contract negotiation

The archive

More ideas worth another look

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S05

Acquired

Kiko

Calendar

We're the best online calendar solution to ever exist. Period.

S05

Acquired

Reddit

Community

The frontpage of the internet.

W06

Acquired

Clustrix

Clustrix provides the leading scale-out relational database engineered for the cloud or data center. ClustrixDB is a drop-in replacement for MySQL and an ideal solution for high-transaction, high-value workloads typically found in businesses such as ad tech, e-commerce, gaming, and large web and mobile businesses. Our customers use ClustrixDB for critical business applications that support massive transactional volume. ClustrixDB delivers more than twenty-five trillion transactions per month for customers including AOL, Nielsen, Match, MakeMyTrip, Photobox, Rakuten, and Symantec. Headquartered in San Francisco, Clustrix is funded by HighBar Partners, Sequoia Capital, U.S. Venture Partners, ATA Ventures, and Y Combinator. ClustrixDB is available in software that runs on commodity hardware and on any cloud. Visit www.clustrix.com to learn more. Follow @Clustrix on Twitter and "like" us on Facebook! #BetterSQL

W06

Acquired

Wufoo

SaaS

Online form builder.

S06

Acquired

OMGPop

Gaming

An independent flash game studio.

W07

Acquired

Weebly

Build a free website that grows with your business.

S07

Acquired

Disqus

Community

Add comments to your website.

W08

Acquired

A Thinking Ape

Gaming

We build communities through massively multiplayer mobile games

W08

Acquired

Heroku

Enabling developers to build and run applications in the cloud.

W08

Acquired

Machine Zone

Gaming

Pioneers of mobile social gaming.

W09

Public

Airbnb

Marketplace

Book accommodations around the world.

W09

Acquired

Heyzap

Advertising

Heyzap (acquired by Fyber for $45m in 2016) is one of the largest…

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