Y Combinator Winter 2011 (W11) Companies

A mobile game developer that creates games for smartphone and tablet platforms, consistently achieving high revenue rankings in the mobile gaming market.

4 investors

Pebble makes customizable smartwatches that receive notifications from users' phones and support downloadable watch faces, apps, and fitness tracking features.

1 investor

Sendoid provides a peer-to-peer file transfer service that lets users send files of any size to others through a simple link-based interface.

1 investor

Siasto is a project management and collaboration platform that integrates with Google Workspace, Box, and Dropbox to consolidate tasks, calendar events, and files in a single interface. The tool serves teams and small-to-medium businesses looking to manage work across multiple applications.

1 investor

SimplyListed provides an iPhone application that allows users to list items for sale by photographing them, with automatic listing generation.

1 investor

SingleStore provides a distributed SQL database designed for real-time transactional and analytical processing in a single engine, serving SaaS builders, data leaders, and enterprises that require high-performance data applications.

8 investors

Storyworth collects family stories through weekly email prompts, saves responses privately for family sharing, and compiles them into printed keepsake books at year's end.

1 investor

Talkable provides a referral marketing platform that enables companies to acquire customers through rewards programs that incentivize their existing customer base. The company serves businesses seeking to grow through customer referrals rather than paid advertising.

3 investors

A messaging platform that enables consumers to contact businesses, now integrated into Google Maps.

1 investor

TellFi provides cloud-based business phone system software with features like extensions, call forwarding, and voicemail, available at low monthly costs. It serves small businesses seeking an affordable alternative to traditional phone system infrastructure.

1 investor

Tremendous operates a platform that enables organizations to issue payouts in the form of money, prepaid cards, and gift cards to recipients globally. The service is used by businesses, nonprofits, researchers, and marketers to automate reward and incentive distribution across 200+ regions.

1 investor

TrustEgg allows parents to establish investment accounts for their children and invite relatives and friends to contribute funds, which are managed through Vanguard until the child reaches age 18.

1 investor

Tumult develops Hype, an HTML5 animation and interactive content creation software used by designers and developers to build animations, infographics, prototypes, and web-based content.

1 investor

Wyzant operates a marketplace connecting students with independent tutors across 300+ subjects. The platform offers one-on-one online and in-person instruction with a Good Fit Guarantee.

2 investors

Upverter is a web-based platform where hardware engineers collaborate on circuit and product designs, sharing components and existing work rather than starting from scratch. The service targets professional design teams, independent contractors, and hobbyist inventors building electronics and hardware products.

1 investor

Userfox provides email automation software that helps companies reduce user churn by sending targeted messages triggered by user behavior, including welcome sequences, inactivity alerts, and custom-defined events.

1 investor

Venuetastic operates a marketplace where event planners can discover and book venues that match their budget, location, and capacity requirements.

1 investor

YouGotListings provides listing syndication and posting automation software for rental property managers and brokers. The platform distributes listings to mainstream sites like Zillow and Apartments.com, automates posting to platforms requiring manual entry, and offers marketing analytics, inventory management, and CRM tools.

1 investor

Zerocater provides corporate meal and snack delivery services for office-based companies across multiple U.S. cities. The company partners with local restaurants and food vendors to supply employees with meals and snacks at their workplaces.

5 investors