YC Summer 2011 (S11) companies

AgileMD builds a clinical decision support platform for hospital care teams, combining an FDA-cleared AI early-warning tool (eCART) with embedded clinical pathways. eCART flags patients at risk of deterioration before a crisis occurs, replacing manual monitoring and ad-hoc escalation decisions. The pathways product delivers up-to-date protocols and order sets directly inside existing EHR workflows, cutting the manual work clinicians do to find and apply current standards of care.

Aisle50 builds digital promotion campaigns for grocery retailers and consumer packaged goods brands, connecting both to shoppers who would otherwise spend at competing stores. Retailers gain incremental store visits and larger basket sizes; CPG brands reach new buyers. The platform replaces traditional circular and in-store coupon programs with web and mobile offers that pull shoppers in-store on demand.

Apollo builds an API orchestration platform that lets engineering teams unify GraphQL and REST APIs into a single, composable graph. Backend teams define data and business logic once, then serve web, mobile, and AI agent clients from that shared layer, eliminating the per-application backends-for-frontends work that otherwise accumulates as technical debt. Enterprise companies use Apollo's open-source libraries and commercial GraphOS platform in place of hand-rolled API coordination and one-off experience APIs.

Automatic makes a hardware-software platform that plugs into any car's OBD-II port and connects it to a driver's smartphone. It gives drivers real-time data on their driving habits, fuel efficiency, and vehicle health, replacing guesswork and expensive dealer diagnostics. The product targets everyday drivers who want a smarter driving experience without buying a new car.

Caviar delivers food from full-service and higher-end restaurants to consumers and groups, handling orders placed through its iOS, Android, and web apps. It works directly with restaurant partners rather than relying on third-party listings, replacing the need for customers to call ahead or arrange their own pickup. Orders scale from single diners to groups of 100, across major U.S. cities.

Citus Data builds a distributed database extension for PostgreSQL, letting engineering teams scale out Postgres horizontally across multiple nodes without migrating to a different database. It targets B2B software companies running multi-tenant SaaS applications or real-time analytics workloads, replacing the need for manual sharding schemes, separate OLAP systems, or a full database migration.

Clerky builds legal document software for startups and their attorneys, covering the full lifecycle from incorporation through fundraising, hiring, and ongoing corporate maintenance. It replaces the manual, error-prone process of drafting and filing startup legal paperwork by guiding founders through formation as a Delaware C corporation, equity issuance, and compliance tasks with accuracy checks and automated support built in.

Clutch builds, maintains, and optimizes websites for small businesses, replacing ongoing site management work that would otherwise fall on owners or internal teams. Customers describe what they need, and Clutch handles design, updates, and search optimization. Sites are generated from the customer's own content and kept consistent through a built-in design system.

Codecademy builds an online learning platform that teaches coding and technical skills to working professionals and career changers. It offers interactive courses across programming languages, data science, AI, cybersecurity, and more, replacing traditional bootcamps, college courses, and self-directed textbook study. Teams and individuals use it to close the gap between the skills they have and the ones employers need.

Compose builds a fully managed database hosting platform for developers, covering MongoDB, PostgreSQL, Redis, and more. It handles the deployment, configuration, and scaling work that engineering teams would otherwise run themselves, removing the operational burden of managing database infrastructure.

Cryptoseal builds cloud-delivered VPN and server key management services for businesses. It targets teams that need encrypted network connectivity and cryptographic key control without running their own infrastructure. The product replaces self-hosted VPN servers and manual key management tooling.

Debteye builds software that automates credit counseling for consumers carrying debt. The product replaces the manual, advisor-driven process of analyzing a borrower's debt situation and walking them through repayment options. Individuals managing student loans, credit card balances, or other personal debt are the primary users.

Draft builds a web-based word processor for writers and collaborators who need clean, intentional version control rather than automatic, hard-to-parse save histories. It lets multiple users track and merge edits without overwriting each other's work, and it connects to Dropbox and Evernote so documents move in without manual copying. A built-in editing service lets users send writing to human editors directly from the tool, replacing the back-and-forth of email attachments and external revision tracking.

Dubjoy translates and dubs video content into multiple languages, serving businesses that produce or distribute video at scale. It replaces the manual, fragmented process of hiring translators and voice talent separately. Bilingual contributors earn income by performing the translation and voice-over work through the platform.

Embark builds mobile apps for urban mass transit riders on iOS and Android, covering major rail and bus systems across the US and UK. The app shows real-time arrival times and sends push notifications for service delays, replacing the guesswork of printed schedules and manual route-checking. Apple acquired Embark in 2013.

Everyme builds a private social network centered on small, closed groups drawn directly from a user's address book. Each group gets its own private news feed for sharing updates, replacing the broadcast model of public social networks with something closer to how people actually communicate with distinct circles of friends, family, or colleagues. Recipients receive shared content without needing to create an account, removing the typical barrier to getting a new network off the ground.

Firebase provides mobile and web app development infrastructure, giving developers hosted services for authentication, databases, storage, cloud functions, crash reporting, and analytics. It covers the full app lifecycle, from build through production, replacing the need to stand up and maintain that backend infrastructure independently. Google acquired Firebase in 2014, and it now operates as a Google product.

Fobo runs a mobile marketplace for buying and selling consumer electronics locally. Sellers receive a guaranteed price upfront and a fast transaction, replacing the back-and-forth negotiation and uncertainty of traditional local classifieds. The app handles the friction of local resale so that a sale closes in minutes rather than days.

Freshplum builds data science and analytics tools for e-commerce companies, giving online retailers access to the kind of automated, data-driven decision-making that previously required an in-house data science team. It targets businesses that sell goods and services online and replaces manual analysis and gut-driven decisions with algorithmic recommendations.

Genius builds the largest music knowledge encyclopedia on the web, serving lyrics, annotations, and artist commentary to music fans. Its content is produced by a community of contributors, an in-house editorial team, and the artists themselves, replacing scattered fan forums and static lyric sites as the canonical place to understand a song. Artists including Frank Ocean, Lorde, and Lin-Manuel Miranda have used the platform to explain their own work directly to listeners.

GlassMap built a mobile location-sharing app for consumers, letting friends broadcast their whereabouts and discover who was nearby in real time. It replaced manual coordination, such as texting back and forth to arrange meetups, with a live map of a user's social circle. GlassMap was acquired by Groupon in January 2013.

GoCardless builds a global bank payment network that lets businesses collect recurring and one-off payments directly from customers' bank accounts across more than 30 countries and currencies. It replaces card rails and manual invoicing with direct bank debit, and adds tools to recover failed payments, contest chargebacks, and detect fraud. A separate open banking data product, built on the Nordigen acquisition, pulls bank account data to help businesses make faster credit and identity decisions.

HackerRank sells an AI-powered technical hiring and upskilling platform to companies recruiting software developers. Employers use it to run coding assessments and live interviews built around real codebases and agentic tasks, replacing resume screening and generic puzzle-based tests. Developers on the other side use the platform to practice, earn certifications, and surface themselves to employers.

Hungry Labs built Snaplayer, a consumer product from the Y Combinator Summer 2011 cohort. The company has since merged into Snaplayer. No further product or customer detail is available from public sources.

Imgix builds a cloud platform that manages, processes, optimizes, and delivers images and video for web businesses. It serves developers and content teams at companies that need images automatically resized for every device, converted to modern formats, and distributed globally, replacing custom in-house imaging infrastructure and patchwork open-source tooling. The platform also handles copyright, content moderation, and accessibility, covering compliance concerns that would otherwise require dedicated imaging engineers.

Interstate builds product roadmap tools for developers and businesses. Teams use it to create and share roadmaps, replacing ad-hoc documents and spreadsheets that are hard to keep current and distribute. The product targets the coordination work between product owners and the people who build or depend on their software.

Kicksend builds a web, mobile, and desktop app that lets consumers print and share personal photos. Users upload photos, then pick up printed copies at retail partners including Walmart, Walgreens, Target, CVS, and Duane Reade, replacing the need to visit a photo lab or use a dedicated printing device. The platform handles ordering, payment, and fulfillment in one flow.

Launchpad Toys builds iPad apps that let young children create and share animated stories through play. Its first product, Toontastic, targets the gap between early imaginative play and formal creative writing by giving kids ages 4–10 a playful tool to construct characters, settings, and storylines on a tablet. The company was acquired by Google in 2015.

LeadGenius supplies B2B sales and marketing teams with custom contact data and buyer intelligence, replacing manual prospecting and static data subscriptions. It combines AI with a human-in-the-loop global research workforce to source contact records, behavioral signals, and buying-committee coverage on demand for specific target personas. The result is continuously refreshed, compliance-ready data tailored to a customer's exact go-to-market requirements rather than pulled from a generic database.

Leaky helps individuals and small businesses compare auto and business insurance plans, prices, and coverage scenarios across major U.S. insurers. It replaces the manual work of calling insurers or visiting multiple sites by centralizing comparisons, policy management, and renewal tracking in one place. The product targets anyone shopping for car or business coverage who wants a clear side-by-side view before buying.

MarketBrief pulls business headlines and breaking news out of SEC filings, processing tens of thousands of regulatory documents daily in near real time. It serves financial professionals who need to track material disclosures across the market, replacing the manual work of reading and summarizing filings by hand.

MixRank collects and sells bulk data feeds on companies, people, job postings, web technographics, mobile apps, and developer activity to sales, marketing, finance, and security teams. It crawls the web, app stores, social media, and dozens of other sources itself, refreshes records hourly, and delivers them directly into customer data warehouses. The product replaces fragmented, stale data from multiple vendors with a single, continuously updated index tied to one company record.

OneSignal builds a customer engagement platform that lets product and marketing teams send coordinated messages across mobile push, web push, in-app, email, SMS, and RCS from a single interface. It targets app developers and growth teams at businesses of all sizes, replacing a patchwork of point-solution messaging tools. An AI layer handles campaign drafting, scheduling, testing, and optimization to reduce manual lifecycle marketing work.

Opez builds a curated discovery and loyalty platform connecting consumers with top-rated local service professionals, such as personal trainers and stylists. It replaces word-of-mouth referrals and generic directory searches by letting users follow specific providers, track where they are working, and build ongoing relationships with them. Membership for service professionals is invitation-only, keeping the supply side selective.

Pagelever builds analytics software for brands managing large Facebook presences. It gives social media and marketing teams detailed measurement of page performance, audience behavior, and content reach, replacing manual reporting and the limited native insights Facebook provides. Pagelever was acquired by Unified Social in January 2013.

Parse builds a cloud-based backend platform for mobile, desktop, and embedded app developers. Its SDKs handle data storage, user authentication, push notifications, analytics, and scheduled cloud code, replacing the need to build and maintain custom server infrastructure. Developers use Parse Core, Parse Push, and Parse Analytics to ship apps without writing backend services from scratch.

PayDragon builds a QR code platform for businesses, covering code generation, a content management system for updating what each code delivers, and in-house design and print services. It also ships a free consumer scanning app, closing the loop between physical print materials and digital content. The product replaces ad-hoc QR tools and disconnected print workflows with a single, managed infrastructure.

Perfect Audience builds a self-service retargeting platform for SaaS companies and online retailers. It serves display ads to visitors who left without converting, pulling them back to complete a purchase or sign-up. This replaces the manual campaign work that would otherwise require an ad agency or a dedicated programmatic team.

PhoneSys builds a phone system designed specifically for sales teams, replacing generic business telephony with a calling setup built around sales workflows. It targets B2B sales organizations that need tighter integration between their phone activity and sales processes.

Picplum builds an automated photo printing and mailing service for parents of young children. It connects to a family's photo library, selects the best shots, and ships printed copies to relatives, replacing the manual work of sorting, ordering, and mailing prints. Parents who never get around to printing photos get a hands-off way to keep grandparents and family up to date.

Proxino builds a cloud platform that monitors and debugs client-side JavaScript for developers. It acts as a proxy layer that intercepts JavaScript in the browser, giving teams visibility into errors and failures that would otherwise surface only in production and require manual reproduction to diagnose.

Quad builds a mobile platform for college students that pulls assignment and coursework data out of syllabi and turns it into structured, trackable schedules. Students use it to manage deadlines, message classmates, and get academic help in one place, replacing manual calendar entry and scattered communication tools. The product targets the daily academic workflow that generic productivity and messaging apps fail to address for students.

Quartzy builds a lab management platform for biotech, pharma, diagnostics, and university research teams. Scientists use it to request and track supplies, manage inventory, and buy from a catalog of over 20 million products, replacing the spreadsheets, email chains, and disconnected vendor portals that slow down R&D operations. It serves labs at every stage, from early-stage startups through large enterprises.

Realm builds a mobile database that replaces SQLite and Core Data for app developers. It provides purpose-built data structures that eliminate the need for a traditional database layer, cutting thousands of lines of code and weeks of development time. The result is faster apps and richer user experiences without the overhead of conventional mobile persistence solutions.

Rentobo builds a rental management platform for landlords, property managers, and agents. It replaces manual listing distribution, paper applications, and in-person lease signing by syndicating listings to major rental sites, consolidating applicant profiles with credit scores and social data, and collecting signatures and deposits electronically.

Ridejoy built a long-distance carpooling marketplace that let drivers list spare seats on road trips and let passengers find and book those rides. It replaced the need to drive alone or buy intercity bus and train tickets for point-to-point trips. The service shut down in early 2013. Note: the current ridejoy.com hosts an unrelated horse-travel platform and does not represent the Y Combinator company.

Science Exchange builds a procurement and supplier management platform for biopharma and biotech R&D teams. Scientists and procurement groups use it to source, onboard, and pay external research suppliers, replacing manual vendor coordination, paper-based compliance tracking, and fragmented purchasing workflows. The platform covers the full cycle from supplier qualification through invoicing, with integrations into existing ERP and procure-to-pay systems.

Segment builds a customer data platform that gives B2B software teams a single API to collect and standardize event data, then route it to hundreds of analytics, marketing, and data warehouse tools. It replaces the work of writing and maintaining separate integrations for each downstream tool or database. Engineering and data teams use it to control where customer data flows without rebuilding tracking logic every time a new tool is added.

Sift builds a fraud prevention platform for digital businesses, covering payment fraud, account takeover, and fake account creation. Retailers, marketplaces, fintechs, and food delivery companies use it to automate risk decisions in real time, replacing manual review queues and static rule sets. Its network aggregates signals across a large base of brands to score transactions and user actions as they happen.

Snapjoy builds an online photo library that pulls in photos from multiple sources, deduplicates them, and organizes them into albums using metadata. It replaces the manual work of sorting and consolidating a personal photo collection scattered across services and devices. Photos are private by default, with selective sharing and cross-account copying available to connected friends.

Streak builds a CRM that lives directly inside Gmail, letting teams track sales, hiring, partnerships, support, and other business processes without leaving their inbox. It replaces standalone CRM tools by turning email threads and contacts into structured pipelines within Google Workspace. Teams get shared contact databases, deal-stage tracking, and workflow automation alongside their existing email.

Stypi builds a browser-based code editor that lets two or more people write and edit code simultaneously in real time. It targets technology companies running remote technical interviews, replacing the back-and-forth of shared screens or pasted snippets with a single live environment. Employers at firms across enterprise technology and consumer internet have used it to conduct and evaluate coding sessions with candidates.

TapEngage built touch-friendly advertising tools for marketers running campaigns on tablets and mobile devices, replacing desktop-era ad formats with interactions designed for touchscreens. The company was acquired by Dropbox. The website now resolves to Subsplash, an unrelated church management platform, and contains no information about TapEngage.

Vapor builds server-side software for in-video advertising. Using a modular architecture, it lets publishers and advertisers embed ad units directly within video content, replacing traditional pre-roll or overlay formats that sit outside the viewing experience.

Verbling connects language learners with verified tutors for live, one-on-one video lessons across more than 70 languages. Learners book sessions on demand and access course materials through a single platform, replacing in-person tutoring centers and fragmented scheduling tools. Verbling also offers group language training for companies.

Videopixie connects businesses and individuals with freelance videographers, editors, animators, and directors through a competitive bidding marketplace. Clients post a project, receive bids from vetted professionals, and choose based on portfolio and price, replacing the work of sourcing and vetting video talent independently. Customers range from retailers commissioning recurring product videos to startups producing crowdfunding or pitch videos.

Vidyard builds a video platform for B2B sales and marketing teams, letting reps record, host, and share personalized videos with prospects and customers. It replaces static emails and generic outreach with trackable video messages, and gives marketing teams tools to manage and distribute video content across the revenue funnel.

Zenbox builds a browser extension that surfaces customer data from dozens of SaaS tools, including Mailchimp, Stripe, Shopify, and Salesforce, directly in the email sidebar. When a user opens an email, Zenbox pulls the relevant customer record from connected services into view, replacing the manual work of switching between tabs and applications to look up context.

Zeus manages residential properties on behalf of homeowners and rents them to corporate clients as furnished, short-to-medium-term housing. It replaces the traditional property management and corporate housing arrangement by bundling leasing, furnishing, and tenant relations into a single operated service. Homeowners hand off their property entirely; companies get vetted housing for relocating or traveling employees.

Zigfu builds a development and distribution layer for Microsoft Kinect applications, letting developers create gesture-controlled apps and consumers play them. It abstracts the complexity of working directly with the Kinect sensor, replacing the need for low-level hardware integration work.