YC Companies/Summer 2009

YC Summer 2009 Data Room

26 companies·Last synced Mar 26, 2026
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26 of 26 companies
MarketPublic ProfileFoundersLinks
B2B
B2B -> Marketing
Public profile enrichment pending.
Andrew Levy
Daniel Kluesing
Evan Rosenfeld

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

Consumer
Consumer -> Social
Mountain View, CA, USA

Bump was acquired by Google in 2013. The Bump and Flock apps were shut down, but our unreleased Photoroll app went on to become the basis for Google Photos, which we led from inception to more than 1B users. Bump let…

30
Andy Huibers
David Lieb

The best way to buy a new car.

Consumer
Consumer -> Transportation Services
Burlingame, CA, USA
Marketplace
Automotive

CarWoo! is the stress-free, organized way to shop multiple dealers to get a great deal on your new car. CarWoo! was founded in 2008 by Tommy McClung and Erik Landerholm and has helped hundreds of thousands of customers …

11
Erik Landerholm
Michael Young
Tommy McClung
Consumer
Consumer -> Social
San Francisco, CA, USA

DailyBooth lets users follow their friends and update them in real-time through the use of pictures and status updates.

2
Jon Wheatley
Ryan Amos

Product recommendations.

Consumer
Consumer -> Home and Personal
San Francisco, CA, USA
Artificial Intelligence
Machine Learning
Recommendation System

Directed Edge delivers Amazon-like "People who bought this also bought..." and "We think you'd also like"-style recommendations to other sites, using existing data being collected such as purchase or click histories. Rec…

2
Scott Wheeler

FanChatter aggregates, amplifies and empowers fan content on every…

B2B
B2B -> Marketing
Minneapolis, MN, USA
Social
Recommendation System

FanChatter fuels your fans so they can promote you better than any ad ever could. Our customers are big guys (NBC Universal, Clear Channel, Gannett) and little guys (bloggers all over the world) who pay us to source and…

11
Luke Francl
Marty Wetherall
Todd Emmel
Consumer
Consumer -> Travel, Leisure and Tourism
San Francisco, CA, USA

FlightCaster predicts flight delays. FlightCaster can predict your probability of delay hours before the airline or any other app notifies you. FlightCaster uses a patent-pending algorithm that scours data on every dome…

2
Bradford Cross
Evan Konwiser
James Bracy
+2 more

We let you know where to go and what to get once you get there.…

Consumer
Consumer -> Content
Palo Alto, CA, USA

At its core GraffitiGeo allows users to leave brief reviews of restaurants, or for those too lazy to do that, to simply leave a "thumbs up" or "thumbs down" — it's like a highly condensed version of Yelp, or a "Digg for …

2
Jared Tame
Nikhil Pandit

HighlightCam edits video, automatically!

Consumer
Consumer -> Content
Mountain View, CA, USA
Video

Founded in 2009, HighlightCam is a YC-alum & 500Startups-funded company bent on taking over the world, one movie at a time. HighlightCam is revolutionizing how users create (and share) movies with a powerful mobile and …

11
Michael James O'Kelly
Michael Katsevman
B2B
B2B -> Retail
San Francisco, CA, USA

InstantQ is an online platform that enables restaurants to distribute JIT promotions to its customers. It was launched in 2009 by Dana Levine and is based in California.

2
Dana Levine
Jeffery Xin Shi
Consumer
Consumer -> Job and Career Services
San Francisco, CA, USA

JobSpice is a surprisingly easy-to-use, intuitive online tool for creating a resume. Changing styles, managing different resumes for different employers, and creating web-based and PDF versions takes only a few clicks.

11
Andrew McCollum
Dane Hurtubise

Lingt provided a web-based platform for learning languages leveraging…

Education
Education
San Francisco, CA, USA
Education

Lingt empowers teachers to speak more with their students. Create and manage online speaking assignments for use in the classroom.

2
Justin Cannon

Mobile marketplace for trading used goods.

Consumer
Consumer -> Home and Personal
Santa Clara, CA, USA; Campbell, CA, USA; Remote
Marketplace
Crypto / Web3

Listia is a new kind of auction marketplace for giving and getting free stuff. Users list items as auctions, and other users bid on these items using credits instead of money. Credits are earned by signing up, giving awa…

6
Gee-Hwan Chuang

Lockitron makes electronic locks you can control locally from your…

Consumer
Consumer -> Consumer Electronics
Palo Alto, CA, USA
Hardware
IoT

Apigy is the developer of Lockitron, a device which can lock and unlock deadbolt locks via remote control or a mobile device.

11
Cameron Robertson
Paul Gerhardt
Robert Witoff

Mixpanel is event analytics for builders that need answers.

Top Company
B2B
B2B -> Analytics
San Francisco, CA, USA
B2B
Analytics
Data Visualization

Mixpanel is analytics for builders that need answers from their data at their fingertips. When everyone in the organization can see — and learn from — the impact of their work, they are poised to make better decisions. C…

410
Suhail Doshi
Tim Trefren

Online IDE. We joined Microsoft in 2014.

B2B
B2B -> Engineering, Product and Design
San Francisco, CA, USA
Developer Tools

NudgePad is an IDE for prototyping in your browser. It allows anyone to launch a fully hosted custom app in two seconds. NudgePad removes all the pain and complication of starting a project, including server setup, d…

2

The best live chat software on the planet. We help you build…

B2B
B2B -> Retail
Ann Arbor, MI, USA
Sales
Customer Service
Chat

Olark is easy-to-use live chat software that lets you talk to customers on your website. Olark can help you track leads, drive sales, increase conversions, and provide great customer service. Real-time visitor inform…

28
Ben Congleton
Matt Pizzimenti
Consumer
Consumer -> Social
San Francisco, CA, USA

Plurchase is an online social shopping site. From it, you can visit online shopping sites like Zappos with the additional of a social toolbar on the right hand side of the page. You can chat with other friends online and…

2
Dean Mao
Jeff Ferber
Tom Saffell

Apartment rental marketplace

Hiring
Real Estate and Construction
Real Estate and Construction -> Housing and Real Estate
New York, NY, USA
Marketplace
Real Estate

RentHop (www.renthop.com) helps renters find great apartments. We use sophisticated data analysis to rank apartment listings based on their "freshness"​, their accuracy and completeness and the responsiveness of the man…

9
Lawrence Zhou
Lee C. Lin

The open source database for the realtime web.

B2B
B2B -> Infrastructure
San Francisco, CA, USA
Open Source

RethinkDB is the first open-source scalable database for the realtime web. It exposes an exciting new access model -- instead of polling for changes, the developer can tell the database to continuously push updated query…

11
Michael Glukhovsky
Slava Akhmechet
B2B
B2B -> Human Resources
Public profile enrichment pending.
Henry Liu
Jingsong Wang
B2B
B2B -> Engineering, Product and Design
Public profile enrichment pending.
Elfred Pagan
Will Liu

Economic infrastructure for the internet.

Top Company
Hiring
Fintech
Fintech
San Francisco, CA, USA
Banking as a Service
Fintech
SaaS

Launched out of Y Combinator’s 2009 Summer batch, Stripe is a global technology company that builds economic infrastructure for the internet. Businesses of every size—from new startups to public companies—use our softwar…

7000
John Collison
Patrick Collison

Tuxebo was a platform for renting things

Real Estate and Construction
Real Estate and Construction
Remote
Marketplace

A Ω

Joachim Krebs
Manvir Kenth
Consumer
Consumer -> Consumer Electronics
San Francisco, CA, USA

WakeMate makes personalized alarm clocks that sync with both a user's body and their cell phone, enabling the iPhone alarm system to sound at the end of a REM cycle. The application/ wristband system also provides a ful…

2
Arun Gupta
Benjamin Anderson

Payments for platform businesses.

Top Company
Fintech
Fintech -> Payments
Redwood City, CA, USA
Fintech

WePay is a multi-party payments API for SMB SaaS, POS Platforms, and Online Marketplaces. It was acquired by JPMorgan Chase in 2018.

400
Bill Clerico