Y Combinator Winter 2011 (W11) Companies

Acunote is a project management and Scrum software tool for teams. The company is based in Silicon Valley.

1 investor

AppHarbor is a cloud platform for hosting and monitoring .NET web applications, providing built-in performance metrics tracking, log management, and integration with third-party monitoring services like Librato.

1 investor

Apportable provides tools for developers to compile Objective-C and C++ applications to Android, enabling them to publish to Android without rewriting code in Java. The service is used by mobile game studios to deploy existing iOS titles to Android app stores.

2 investors

Balanced provides payment infrastructure designed for online marketplaces, aiming to unlock new commerce activity.

1 investor

Beetailer provides software that enables merchants to set up and operate storefronts within Facebook, offering integrated promotional tools and performance analytics to track customer engagement.

1 investor

Close is a CRM platform that provides sales software for businesses, emphasizing communication features and automated data entry to improve sales representative productivity.

1 investor

Comprehend develops software for clinical trial operations teams to consolidate and analyze trial data from multiple sources in real-time, helping them move treatments through clinical testing more efficiently and safely. The platform serves clinical research organizations, data teams, and medical reviewers with tools for monitoring, risk assessment, and case review.

3 investors

Convore is a web-based platform for real-time group messaging and topic-based discussions, with support for both public and private communities.

1 investor

Custora provides segmentation and predictive analytics software that helps e-commerce retailers identify and market to individual customers through integrations with email, display advertising, and audience platforms like Facebook and Google.

4 investors

DrChrono is a mobile-first, AI-powered healthcare platform for independent medical practices that manages scheduling, charting, billing, and patient communication in a single system. The company serves solo practitioners and multi-location clinics with features designed to reduce administrative burden and improve revenue.

6 investors

A platform that lets musicians and record labels purchase targeted music streaming placements, similar to how advertisers bid on search keywords.

1 investor

FitFu was a mobile fitness app that used device accelerometers to track user motion and provide activity feedback, with social features allowing friends to share progress and compete for levels and points.

1 investor

Five Stars is a customer acquisition and loyalty platform that helps local businesses attract nearby customers with targeted offers, collect performance insights on customer behavior and sentiment, and encourage reviews. The platform serves retail and hospitality businesses.

3 investors

Flotype develops middleware and frameworks for building real-time web applications, serving enterprises across financial, social, and logistics sectors as well as developers using Node.js and JavaScript.

1 investor

GOAT Group operates a suite of e-commerce platforms for buying and selling authentic sneakers, apparel, and accessories, serving a global community across multiple brands.

1 investor

Dropbox Sign is an electronic signature platform that enables businesses to prepare, send, sign, and track legally-binding contracts and documents from anywhere. The service offers document workflow automation with integrations into existing business tools.

5 investors

A searchable catalog indexing video content available across major streaming platforms including Amazon Prime Video, Netflix, Hulu, and iTunes.

1 investor

Humble Bundle is a digital storefront and membership service that sells games, ebooks, software, and digital content, with a mission to support charitable causes while offering discounted pricing to customers.

2 investors

A self-publishing platform that enables individuals to create and distribute ebooks to a mass audience.

1 investor

Inporia develops Kaleidoscope, a mobile shopping app available on Android and iPhone that combines product inspiration with e-commerce functionality.

1 investor

Insight Data Science operates a seven-week post-doctoral fellowship that trains PhDs and engineers for careers in data science, data engineering, and AI, with locations across the United States and a remote option. The program has placed over 1000 graduates at major technology companies and other organizations.

1 investor

Instapainting is an online platform that connects customers with artists worldwide to create custom paintings and artwork. The service provides collaboration tools enabling customers to review, communicate with artists, and request revisions throughout the creation process.

1 investor

Lanyrd is a social directory for discovering and tracking conferences where users can find events attended by their social network contacts, maintain a public record of their speaking engagements, and view summaries of conference content and updates.

2 investors

Mailgun provides an API platform that enables businesses to send, receive, and track transactional and marketing email messages.

3 investors