Y Combinator companies

We're creating every women's fantasy by combining the unwanted…

Ark organizes the world's social information.

Kid's first smartphone with web-based parental controls.

BookSolid is the opentable for tour operators.

Backlift allows front-end only developers to build entire websites…

Carsabi is the search engine for used cars

App that connects two phones and creates a private timeline to share…

Client-side encryption for your devices and the cloud.

Givespark was a celebrity charity fundraising platform

We filter distracting emails away from your inbox.

We set up drinks between 2 groups of friends: 3 guys and 3 girls.

Customer communication for iOS and Android developers - an in-app…

Live Pet Jellyfish & Unique Aquariums For Sale | USA Jellyfish Art

LendUp is a socially responsible company on a mission to redefine…

We make mobile MMOs.

Make School is redesigning college for the 21st century. Students…

Marft creates embeddable machine learning models for application…

Simple multiplayer game servers.

Fb ad optimization platform

Github for designers. We automatically keep track of revisions of…

Sysadmin as a service. We make deploying, configuring, monitoring,…

Instantly talk or text to one or a group of friends at once with the…

Games For Education

The Muse is values-based job search & hiring for 7M+ monthly

Really secure file sending for big files.

Palantir for sales people

Deal search service

Making Draft. Super simple version control and collaboration for…

Dubjoy translates and voice-overs your video to any language

The #1 private social network

Now part of Snaplayer.

Create & Share Product Roadmaps

Send and print photo albums with people you love. Acquired by Lyft

Online auto and business insurance. (Acquired 2013)

Generate stories from SEC filings.

Yelp for service pros.

Hyperlinking the real world.

The Phone System for Sales Teams.

Javascript proxy.

Quad is where college students get things done.

The easiest way to find a tenant. Rentobo is a tool that makes it…

Long-distance carpooling marketplace. Shut down in early 2013.

Photo library.

In-video advertising.

Brings dozens of SaaS's (Mailchimp, Stripe, Shopify, Salesforce,…

Layer above Kinect.

.NET Cloud Platform as a Service

Pivoted to TenXList, a professional network of top college engineers.

Payments for Marketplaces

Facebook stores.

Hosted IRC and so much more.

New projects

Third generation of web apps.

Ebook publisher.

Fashion shopping email list.

Turning PhDs & engineers into data scientists & data engineers

Siasto is a collaboration tool designed for SMBs who use Google Apps,…

Sell your stuff.

Google Voice for business.

Trust funds.

Online tutoring marketplace.

User retention as a service. Drip email

Venue marketplace.

iPad drawing software.

Crowdsourced design marketplace for paper goods.

Better Microsoft Project.

Friends motivate one another: I'll do x if you do y.

iPad games.

Local chat.

Q&A for businesses.

New email inbox.

Like Twitter but you post others' status.

Personal debt and credit management. Acquired by Avant in 2015.

Teevox

Upbeat: Building the next generation of Public Relations (PR)

Fabricly

LaunchHear was a startup attempting to make PR scale in the same way…

The best way to buy a new car.

FanChatter aggregates, amplifies and empowers fan content on every…

HighlightCam edits video, automatically!

Online IDE. We joined Microsoft in 2014.

Online marketplace for equipment rental