Y Combinator Summer 2009 (S09) Companies

1 investor

Bump built mobile apps that let people exchange contact information and photos by bumping phones together, and also made photo-sharing apps including the unreleased Photoroll that became the basis for Google Photos. The company was acquired by Google in 2013.

1 investor

CarWoo! operates an online service that lets consumers shop and compare offers from multiple car dealerships to purchase a new vehicle. It targets individual car buyers seeking a less stressful dealership buying experience.

1 investor

DailyBooth was a photo-based social network where users shared pictures and status updates to follow friends and share real-time life updates.

1 investor

Directed Edge provides a recommendation engine that generates product recommendations such as "people who bought this also bought" and personalized suggestions for other websites, using purchase and click history data. Recommendations are served in real time through a REST API with bindings for multiple programming languages.

1 investor

FanChatter is a marketing platform that aggregates and showcases fan-generated social content so companies can use it to promote their brands. It serves both large media companies and individual bloggers.

1 investor

GraffitiGeo is a location-based service for leaving short reviews, thumbs up/down votes, and check-ins at restaurants via its website and iPhone app. It adds game mechanics, letting users earn points, form "mobs" with friends, and claim city-block territory.

1 investor

HighlightCam offers a mobile and desktop video-editing platform that automatically assembles users' videos and photos into finished movies. It targets consumers looking to create and share personal video highlights.

2 investors

InstantQ was an online platform that let restaurants send just-in-time promotions to their customers. The company launched in 2009.

1 investor

JobSpice is an online tool for creating resumes, letting users change styles, manage multiple resumes for different employers, and produce web-based and PDF versions. It serves job seekers building and formatting their resumes.

1 investor

Lingt offers a web-based platform for language learning that lets teachers create and manage online speaking assignments for classroom use.

1 investor

Listia operates a mobile auction marketplace where users list used goods and bid on items using earned credits instead of money. Members accumulate credits by signing up, giving away items, and staying active on the platform.

1 investor

Lockitron, developed by Apigy, makes electronic locks that can lock and unlock deadbolts remotely or via a mobile device. The company produces smart lock hardware for controlling access to doors.

2 investors

Mixpanel provides event-based product analytics that lets teams across an organization explore their data and measure the impact of their work. It is used by companies to understand customer behavior, track progress, and inform decisions.

5 investors

NudgePad is a browser-based IDE for prototyping that lets users launch a fully hosted custom app and handles server setup, deployment, version control, SSL, DNS, and API integrations. Every app built in the tool also functions as a template, allowing designers and copywriters to edit content without writing code. The company joined Microsoft in 2014.

1 investor

Olark offers live chat software and an AI agent that businesses install on their websites to answer visitor questions, qualify leads, and route conversations to human staff. It provides real-time visitor data such as location, login name, and cart contents to help marketing and customer service teams personalize interactions.

1 investor

Plurchase is an online social shopping site that lets users browse partner retail sites like Zappos through a social toolbar, chat with friends, and see what items others are viewing. It targets online shoppers looking for a shared, social browsing experience.

1 investor

RentHop operates an apartment rental marketplace that ranks listings using data analysis based on freshness, accuracy, completeness, and manager responsiveness, offering list- and map-based search tools to renters. It also provides brokers and property managers tools to promote listings, get leads, and schedule viewings.

1 investor

RethinkDB is an open-source, scalable database for the realtime web that pushes updated query results to applications continuously instead of requiring polling. It provides a query language with features like table joins and groupBy, a parallelized architecture, and web-based cluster management tools for developers building realtime apps.

2 investors

1 investor

1 investor

Stripe builds payment and financial infrastructure software that lets businesses accept payments and run their operations online. It serves companies of all sizes, from early-stage startups to public companies, worldwide.

87 investors

Tuxebo operated an online marketplace for equipment rental, connecting people who wanted to rent items. The company is now inactive.

1 investor

WakeMate makes a wristband and companion app that track sleep using actigraphy and trigger a phone alarm at the optimal point in the user's REM cycle. It offers sleep analysis for consumers through an accompanying analytics platform.

1 investor