Y Combinator Summer 2011 (S11) Companies

AgileMD operates a forum for users and customers to exchange ideas, questions, and techniques related to the company's services and operations.

2 investors

Aisle50 operates a marketing platform that connects grocery retailers and consumer packaged goods brands with shoppers through promotional campaigns, helping retailers increase basket size and trip frequency while offering consumers discounts on products.

2 investors

Apollo provides a GraphQL-based API orchestration platform that unifies APIs and data sources for backend teams and frontend applications. The platform enables enterprises to build federated graphs, manage AI agent workflows, and accelerate application development across web and mobile.

7 investors

Automattic builds and operates a portfolio of web publishing and communication platforms, including WordPress.com, WooCommerce, Jetpack, Tumblr, and Beeper, serving content creators, small businesses, and publishers. The company contributes to open-source projects and focuses on web infrastructure and freedom.

3 investors

Caviar is a food delivery platform that partners with restaurants to fulfill orders placed through its web and mobile applications. The service connects customers to restaurants across major U.S. cities and provides restaurants with tools to expand their customer base and sales.

3 investors

Citus is a Postgres extension that enables horizontal scaling of databases by distributing data and queries across multiple nodes. It serves SaaS applications, real-time analytics platforms, and microservices architectures that need to scale transactional and analytical workloads on a single distributed database.

7 investors

Clerky provides software that automates routine legal paperwork and clerical tasks, serving both startups and attorneys. The platform allows startups to complete legal documents independently or with attorney collaboration, while attorneys can review and track client documents.

1 investor

Clutch is a visual builder platform that enables creation of AI-powered, personalized websites using drag-and-drop agents, component libraries, and integration with existing tools and data. The platform serves e-commerce and web design teams seeking to increase conversions through conversational commerce, generative landing pages, and AI-driven search experiences.

1 investor

Codecademy is an interactive online learning platform that teaches coding and technical skills to individuals worldwide. The company serves learners across all levels seeking to develop modern technical competencies for career advancement and personal growth.

7 investors

Compose provides managed hosting and scaling for multiple database types including PostgreSQL, Redis, and MongoDB, serving developers who need operational database infrastructure.

1 investor

CryptoSeal offers VPN services to users seeking private network access.

1 investor

A financial comparison and guidance platform that helps consumers research and compare financial products including student loans, mortgages, personal loans, credit cards, savings accounts, and insurance. The site provides expert reviews, educational content, and free credit monitoring tools to help users make informed financial decisions.

1 investor

Draft is a web-based word processor that combines document editing with version control capabilities, serving individual writers and collaborative teams who want organized draft management and file integration.

1 investor

Dubjoy provides video translation and voice-over services, allowing content producers to reach international audiences while enabling bilingual speakers to earn income as voiceover contributors.

1 investor

Embark provides a mobile application that displays real-time arrival information for trains and buses across multiple transit systems in the US and UK, including alert notifications for service disruptions.

1 investor

Everyme provides a private social network where users share content with selected groups called Circles, which pull from their existing contacts and display posts in a private feed.

1 investor

Firebase is a backend-as-a-service platform that provides managed infrastructure, SDKs, and development tools for building and deploying applications across iOS, Android, web, Flutter, Unity, and C++. It integrates with Google Cloud and AI technologies to help developers accelerate app development, monitor performance, and optimize user experience.

3 investors

A mobile marketplace that allows users to sell consumer electronics locally with guaranteed pricing and upfront payment, completing transactions within 97 minutes.

1 investor

Freshplum provides analytics tools designed to help e-commerce and online service businesses make data-driven decisions. The platform brings data science capabilities to companies selling products and services online.

2 investors

Genius is a crowdsourced music encyclopedia where a community of contributors annotates and discusses song lyrics, artist information, and music culture across all genres. The platform serves artists, creatives, and music fans who want to explore and share deeper context about music and its creators.

3 investors

GlassMap built a mobile app for iOS and Android that allowed users to share their location with friends, coordinate meetups, and discover nearby people and activities.

1 investor

GoCardless provides bank payment collection and open banking data access services. The platform enables businesses to collect domestic and international payments via bank accounts and securely access customer bank account data across 2,300+ banks in the UK and Europe.

7 investors

HackerRank is an AI-driven hiring and assessment platform that focuses on responsible AI development with emphasis on bias detection, data privacy, and fairness in hiring processes. The company serves organizations and candidates seeking unbiased technical evaluation and skills assessment.

6 investors

1 investor