Y Combinator Winter 2011 (W11) Companies

Acunote is a software company based in San Francisco.

1 investor

AppHarbor is a .NET Platform-as-a-Service where developers push code via Git or Mercurial to have it built, unit-tested, and deployed to a scalable cloud platform. It targets .NET developers building and deploying ASP.NET applications without managing servers, configuration, or scaling.

1 investor

Apportable provides a toolchain that cross-compiles Objective-C iOS apps to Android, letting developers deploy to Android stores from their existing Objective-C or C++ code without maintaining a separate Java codebase. It is used primarily by iOS game developers.

3 investors

Balanced provides payments infrastructure for online marketplaces, aiming to enable new forms of commerce. It positions itself in the payments/fintech space for marketplace businesses.

2 investors

Beetailer offers software that lets merchants import their existing web store onto Facebook and provides tools for promoting the store along with sales analytics. It serves online retailers looking to sell through social channels.

1 investor

Close builds an AI-native CRM and sales automation suite that unifies customer communication channels for sales teams. It serves B2B sales organizations in the sales enablement and CRM software category.

1 investor

Comprehend offers cloud-based clinical intelligence software for clinical operations, data management, and medical review teams, providing insights and automation to improve the speed, safety, and quality of clinical trials. Its applications unify, monitor, and analyze clinical data across sources in real time, covering CRO oversight, centralized and risk monitoring, data review, and medical monitoring.

3 investors

Convore is an online platform for real-time group communication, letting users join or create groups and post topics to hold conversations with others. It supports both public and private groups.

1 investor

Custora is a predictive analytics and customer segmentation platform for online retailers, using customer analytics methods and integrating with marketing tools such as ESPs, display, Facebook Custom Audiences, and Google Customer Match. It helps e-commerce marketers target customers as individuals and deliver more relevant communications.

4 investors

DrChrono builds a cloud platform for medical practices offering electronic health records (EHR), telehealth, practice management, medical billing, and revenue cycle management, with an API and app marketplace for extensibility. It serves physicians and patients across the healthcare industry.

7 investors

Earbits was a music promotion company that helped artists and labels market their music, operating as a YC-backed startup (W11) before being acquired. The page is a personal profile of a co-founder rather than an active company site.

2 investors

FitFu was a gamified fitness mobile app for iPhone and iPod Touch that used the device's accelerometer to track users' physical activity and provide feedback toward their goals. It added social features for comparing progress with friends and used points and levels to keep users motivated. (Now closed.)

1 investor

Fivestars is a customer loyalty and payments platform for small local businesses, turning transactions into ongoing customer relationships. Launched in 2011, it connects consumers with local merchants to drive repeat sales.

3 investors

Flotype builds enterprise middleware and developer frameworks for real-time messaging and interactivity. Its products serve software companies and enterprises across sectors such as social web, financial services, and fleet management.

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

HelloSign provides eSignature, digital workflow, and electronic fax software used by individuals and companies to manage and automate business transactions. It targets small and mid-market businesses as well as larger enterprises.

7 investors

Hotspots (operating as Moki.TV) built a real-time analytics product and a directory of paid and free content available across streaming services including Amazon, Netflix, Hulu, and iTunes. The company was acquired by Twitter in 2012.

1 investor

Humble Bundle is a digital content distribution platform that sells games, ebooks, and software through pay-what-you-want bundles, an online storefront, and a monthly subscription service, with a portion of sales going to charity. Founded in 2010, it serves consumers buying digital entertainment and software.

2 investors

Hyperink is a self-publishing platform that lets individuals publish and sell ebooks. The San Francisco-based company operates in the ebook publishing space.

1 investor

Inporia is an ecommerce company whose product is a fashion-focused inspiration shopping app and widget. It targets consumers browsing and shopping for fashion online.

1 investor

Insight runs an intensive seven-week post-doctoral training fellowship that helps PhDs and engineers transition into careers in data science, data engineering, health data, and AI. The program operates in Silicon Valley, New York City, Boston, Seattle, and remotely across the US.

1 investor

Instapainting is an e-commerce marketplace that turns customer photos into hand-painted oil paintings on canvas, created by artists and shipped to buyers. It serves consumers seeking custom artwork, offering a 10"x10" painting for $45 delivered within two weeks.

1 investor

Lanyrd is a social conference directory that connects to Twitter to help users find conferences their contacts are attending, build a portfolio of talks they have given, and follow what happens at events. It serves conference attendees and speakers.

2 investors

Mailgun is a developer-focused email delivery platform that lets companies send, receive, and track transactional and marketing emails through an API. It serves developers and businesses needing email deliverability infrastructure.

4 investors