YC Winter 2012 (W12) companies

42Floors builds a search platform for commercial office space, serving businesses looking to find and evaluate available listings across major U.S. markets. It replaces the fragmented, broker-dependent process of sourcing office space by centralizing listings with high-quality photography and the data needed to make a leasing decision. The platform is free to use. 42Floors was acquired by Knotel in 2018.

99dresses builds a peer-to-peer marketplace where women buy, sell, and trade clothing with each other online. The platform targets fashion-conscious shoppers who accumulate unwanted items and want to refresh their wardrobes without paying full retail prices. It replaces the friction of one-sided resale apps by letting users swap pieces directly, turning idle closet inventory into new outfits.

Amiato connects unstructured NoSQL databases, such as MongoDB and CouchBase, to business intelligence tools, letting analysts run reports and ad-hoc queries against data that previously resisted structured analysis. It targets businesses that have adopted flexible document databases but still rely on conventional BI tooling to make decisions. The product replaces manual ETL engineering and schema-mapping work that would otherwise take weeks to stand up.

Amplitude builds a digital analytics platform for product, marketing, and data teams who need to understand how users move through their software. It combines product analytics, session replay, feature experimentation, and customer data tools in one place, replacing the patchwork of separate point solutions those teams would otherwise stitch together. Customers range from early-stage startups to large enterprises across fintech, ecommerce, media, and B2B software.

Ark builds a people search engine that indexes social network profiles across the web. Users search for individuals, whether new contacts, old classmates, or existing connections, and retrieve consolidated profile information in one place. The product replaces manual, platform-by-platform lookup of publicly available social data.

Authy builds a two-factor authentication platform for developers and enterprises, replacing password-only login with a second verification layer that guards against account takeovers and credential attacks. Organizations integrate Authy's API to add 2FA to their products, while end users manage their own authentication across devices through a free mobile app.

BarSense builds a parental control app that turns any Android phone into a managed device for young children. Parents use a web dashboard to whitelist contacts, approve apps, set game time limits, and track the child's GPS location in real time. The app locks the phone into a child-facing interface, replacing the need for a dedicated kids' handset.

BookSolid builds an online booking marketplace for tour operators, letting travelers discover and reserve tours the way restaurant diners book tables through a centralized reservation platform. It replaces phone calls, email back-and-forth, and manual scheduling between operators and their customers.

Brace builds a website hosting platform for front-end developers that removes server-side complexity. Teams publish and update sites by saving files to Dropbox, replacing traditional deployment workflows. Every site gets a Draft environment for iteration and a Production environment optimized for performance.

Carsabi builds a search engine for used cars, giving consumers a single place to find and compare pre-owned vehicle listings across the market. It replaces the need to manually browse multiple dealership sites or classified listings to locate the right car at the right price.

Chute builds a user-generated content platform for brands, agencies, and publishers. It handles the full workflow from discovering consumer photos and videos via visual and text search, to producing and distributing branded visual content. This replaces manual UGC sourcing and fragmented creative production processes across marketing teams.

CircuitHub assembles printed circuit boards on demand for hardware and robotics companies that need fast, low-cost prototype and small-batch production. Its automated manufacturing platform ships the majority of full turnkey orders within three days, replacing the slow, expensive quoting and production cycles of traditional contract manufacturers. Customers such as Tesla, NASA, and Zipline use CircuitHub to compress the time between a board design and a finished, tested assembly.

CleverDeck builds a spaced-repetition flashcard app for iOS that helps people learn foreign language vocabulary. It ships hand-curated decks of 3,000 high-frequency words across more than a dozen languages, each card carrying a translation, transliteration, native-speaker audio, and example sentences. The app replaces manual study methods and generic flashcard tools by automatically scheduling reviews at widening intervals based on how well each word is remembered.

CoderWall builds a collaborative learning platform where software developers sharpen their programming skills by sharing and discovering tips from peers. It targets working developers who want to grow their technical knowledge outside of formal training or documentation. The platform replaces ad hoc searching across blogs and forums with a structured, community-driven knowledge feed.

Couple built a private mobile app for romantic partners to share messages, photos, and a shared timeline, replacing the patchwork of general-purpose messaging and social tools couples were adapting for one-on-one communication. The current couple.me website operates as an AI companion product, letting users create and chat with a customizable AI girlfriend or boyfriend, which is a different product from the original two-person messaging app described in the program.

Documents.Me builds client-side encryption and mobile file sharing software for enterprise customers. It protects files on devices and in cloud storage by encrypting data before it leaves the user's control, replacing reliance on cloud providers or IT teams to secure sensitive content in transit and at rest.

Exec connects homeowners with vetted cleaning and handyman professionals, covering recurring home cleaning, move-out cleans, furniture assembly, plumbing, electrical work, and outdoor projects. Customers book on demand via iPhone or the web, replacing the effort of sourcing, vetting, and scheduling independent contractors.

FamilyLeaf builds a private social network for families, giving members a shared space to post photos, life updates, messages, and contact information. It targets everyday family communication that falls through the cracks of public social platforms. The product replaces ad-hoc group chats and public social feeds with a dedicated, closed family hub.

FarmLogs builds farm management and financial software for farmers and agribusinesses. Farmers use it to track operations, manage finances, and make decisions aimed at improving yield and profitability per acre. On the agribusiness side, the platform handles customer relationships, grain trading workflows, payments, and digital communications, replacing manual and paper-based processes across both sides of agricultural commerce.

Flutter builds a video-based dating app that replaces static photos and bios with short, ephemeral video clips. Singles browse videos of nearby users and, when two mutually interested people are online simultaneously, must hold eye contact through live two-way video for 15 seconds to confirm a match. Push notifications alert users when someone they have liked comes online, making the real-time connection mechanic work in practice.

Fond builds an employee rewards and recognition platform for HR teams at mid-size and enterprise companies. It consolidates recognition, reward redemption, corporate discounts, and engagement analytics into a single system, replacing the patchwork of manual processes and disconnected tools HR departments typically manage. The result is less administrative overhead and a single view of employee engagement activity.

GiveSpark builds a platform connecting celebrities with charitable fundraising campaigns. It serves nonprofits and charities looking to leverage celebrity reach to raise money, replacing manual outreach and coordination between causes and their high-profile supporters.

Glider builds an email filtering and workflow tool for managing deal and contract processes. It serves businesses of all sizes, from large public companies to small growing ones, replacing the manual work of tracking, organizing, and following up on contract-related email threads. The product keeps deal activity separate from general inbox noise so teams stay focused on closing rather than managing correspondence.

Grouper organizes social outings for two small groups of friends, typically three and three, who meet for drinks at a local bar. It replaces the friction of cold introductions in dating apps by putting people in a relaxed, friend-group setting from the start. The service operates across major U.S. cities and targets adults looking for a more social, lower-pressure way to meet new people.

Gusto builds an integrated platform for payroll, benefits, and HR aimed at small and growing businesses. It handles payroll processing, health insurance, and 401(k) administration, replacing the manual work and fragmented tools that business owners and HR teams would otherwise manage across multiple vendors. The platform also automates compliance and tax filings that come with running payroll.

HackPad builds a real-time collaborative document platform for teams, replacing static wikis and disconnected note-taking tools. It handles company knowledge bases, personal notes, event planning, and classroom coordination in a single shared workspace where edits appear live for every contributor.

Hipmob gives iOS and Android app developers a suite of customer communication tools: live chat, helpdesk, feedback collection, and engagement features built directly into mobile and tablet apps. It replaces the patchwork of web-based support tools that do not translate cleanly to mobile, giving teams real-time context about each user, including device, OS, location, and app state, at the moment of contact.

HireArt builds a contract workforce management platform for HR teams, hiring managers, procurement, and finance leaders at mid-to-large companies. It combines employer-of-record employment, vendor management, sourcing and recruitment, worker classification, and compliance into a single system, replacing the fragmented mix of staffing agencies, separate EOR providers, and manual tracking tools those teams otherwise juggle. Candidates are screened through work samples and video assessments before placement, with account managers evaluating culture fit, experience, and communication skills.

iCracked runs an on-demand repair service for iPhones, iPads, and Samsung Galaxy devices, dispatching background-checked technicians to wherever the customer is. It replaces the trip to a carrier store or manufacturer service center with a same-location visit that completes the repair in under 30 minutes. The network operates across three countries and is expanding into smart home services.

Jellyfish Art sells live jellyfish, purpose-built aquarium tanks, and all supporting supplies to hobbyists keeping jellyfish at home. Jellyfish require specially engineered water flow to stay suspended away from filtration intakes, and frozen plankton-based food unavailable through conventional pet retailers. Jellyfish Art ships the full setup, including the live animals via overnight express, to customers anywhere in the U.S. through its direct-to-consumer website.

LendUp operates a loan-matching marketplace for borrowers across all credit types, connecting them with licensed lenders for payday, installment, and personal loans. It targets consumers who need short-term credit and replaces the work of individually vetting lenders by surfacing matched offers alongside plain-language cost and risk disclosures.

Loom builds a screen and camera recording tool that lets teammates and customers send short video messages in place of meetings, emails, and written walkthroughs. Users record directly from a browser extension, desktop app, or mobile app, then share a link wherever they already work. AI features surface technical context automatically and can convert a recorded walkthrough into a populated bug ticket.

LVL6 builds social mobile MMOs for Android and iOS, targeting consumer players who want multiplayer gaming on the go. The games deliver connected, persistent play experiences that replace single-player or desktop-bound alternatives.

Make School builds a two-year, project-based bachelor's degree in Applied Computer Science aimed at students from low-income and underrepresented backgrounds, replacing the traditional four-year university path to a tech career. The curriculum combines computer science fundamentals, software development, and professional preparation, targeting graduates for roles as software engineers, product managers, or founders. The program has since transferred to Dominican University of California, with Make School continuing to support alumni through a scholarship fund.

Marft builds embeddable machine learning models for application developers. Developers submit training data via a web interface or API and receive optimized, production-ready models in their language of choice. This replaces the work of building, tuning, and integrating custom ML pipelines from scratch.

Matterport builds an end-to-end platform for capturing real-world spaces and converting them into navigable 3D digital twins. It serves real estate brokers, property managers, architects, and construction teams, replacing manual site visits, hand-drawn floor plans, and static photography. The platform covers capture hardware, cloud processing, model hosting, browser-based viewing, and VR playback in a single workflow.

Medigram builds governance and evidence infrastructure for AI decisions in hospital settings, giving health systems the ability to authorize, monitor, verify, and preserve audit trails for consequential AI actions. The product targets the gap between AI policy documents and provable AI behavior, replacing ad-hoc or vendor-controlled audit logs that hospitals cannot access or reconstruct. It runs on-device to maintain oversight even when hospital network connectivity fails.

Medmonk builds a pharma market access platform that manages the full patient access lifecycle, from first prescription through long-term adherence, on behalf of pharmaceutical brand teams. It automates copay enrollment at the pharmacy counter, handles prior authorizations and benefit investigations, and runs hub and patient support workflows for specialty and rare disease brands. The platform replaces manual, fragmented access and affordability processes that slow therapy starts and erode adherence.

Midnox builds a mobile video app for consumers who want to capture and share HD footage. It applies real-time stabilization, filters, and zoom during recording, and lets users adjust those settings after the fact. Friends can follow, like, and comment on each other's videos, replacing the separate editing and social-sharing steps that other tools require.

Minefold provides on-demand multiplayer game servers for titles such as Minecraft and Team Fortress 2, letting players launch a server in under 30 seconds without any setup or infrastructure work. It replaces the manual process of configuring and hosting dedicated game servers.

MyVR builds property management software for short-term rental operators, letting them list, sync, and manage bookings across channels such as Airbnb, Vrbo, and Booking.com from one dashboard. It also gives operators tools to run their own direct-booking website, automate routine tasks like messaging and scheduling, and connect third-party services through an open API. The product replaces manual coordination across multiple listing platforms and the patchwork of separate tools operators otherwise stitch together.

Optilly/Installmonetizer builds a Facebook ad optimization platform for B2B marketers. It adjusts and targets ad campaigns based on user attributes, replacing manual audience segmentation and bid tuning. Advertisers get automated performance optimization across their Facebook ad spend.

Per Vices builds Software Defined Radio hardware for mission-critical wireless applications in defense, industrial, and telecommunications settings. Its modular SDR products consolidate multiple RF sub-systems and components into a single platform, cutting integration complexity and development time for engineers building custom wireless systems. Customers replace racks of discrete radio hardware with a single Per Vices unit they can program to fit their application.

Pixelapse builds version control and collaboration tools for designers, giving them structured revision tracking analogous to what developers use with Git. Design teams use it to organize files, iterate on assets, and collect feedback, replacing chaotic shared folders and manual naming conventions like "final_final_v2". Pixelapse was acquired by Dropbox in early 2015 and later shut down as a standalone product, with its features folded into Dropbox.

PlanGrid builds construction productivity software for contractors and owners working across commercial, heavy civil, and other project types. Its cloud-based platform lets field and office teams manage blueprints, specs, photos, RFIs, field reports, and punch lists from mobile devices and desktop, replacing paper-based and disconnected document workflows. The platform operates across projects in dozens of countries and hosts one of the largest repositories of digital construction blueprints in the world.

Priceonomics builds a content marketing platform that turns a company's internal data into published articles and data stories. Businesses use it to produce data-driven editorial that would otherwise require a dedicated research and editorial team. The website also runs its own data journalism covering economics, pricing trends, and consumer behavior.

Rescale builds a cloud platform for high-performance computing, simulation, and AI-assisted engineering, serving R&D and IT teams at large industrial companies in automotive, life sciences, aerospace, and manufacturing. Engineers use it to run multiphysics simulations, model new designs, and orchestrate compute workloads across hybrid cloud infrastructure, replacing on-premise HPC clusters and fragmented software environments. The platform ships with over a thousand pre-installed simulation and AI/ML applications alongside unified management tools for cost tracking, security, and compliance.

Ridecell builds an AI platform for automotive leasing and fleet operations, serving leasing companies, rental fleets, commercial operators, and government fleets. It connects telematics, vehicle systems, and enterprise platforms to automate tasks that fleet teams currently handle manually: tracking delayed vehicle deliveries, auditing invoices for overcharges, flagging underperforming suppliers, timing asset remarketing, and resolving idle vehicles. The result is autonomous monitoring and decision-making in place of cross-system, staff-driven workflows.

Screenleap builds browser-based screen sharing software for individuals and teams who need to present or collaborate without asking viewers to install anything. Hosts share their screen from desktop, tablet, or smartphone; viewers join through any browser via a link. It replaces heavyweight conferencing tools and plugin-dependent screen sharing with a zero-install flow that also exposes an API so developers can embed screen sharing, video, and audio directly into their own products.

SendHub sells a business SMS platform that lets companies send bulk campaigns, automate reminders, and run two-way text conversations with customers and field workers. It serves businesses from small shops to large enterprises across industries including healthcare, auto dealers, restaurants, schools, and transportation. The platform replaces manual outreach and fragmented messaging tools with a single inbox that handles mass texting, scheduled messages, group threads, surveys, and MMS.

Sendwave builds a mobile app for international money transfers, letting diaspora communities in North America and Europe send funds to family in Africa, Asia, and the Americas. It replaces bank wires, remittance storefronts, and high-fee transfer services by delivering transfers in seconds with no service fees and competitive exchange rates.

Shoptiques aggregates inventory from independent local boutiques into a single online storefront, letting shoppers browse and buy curated, fashion-forward pieces without visiting individual boutique websites or stores. It serves fashion shoppers who want distinctive clothing, shoes, accessories, and home goods that fall outside the mainstream retail assortment. The platform replaces both aimless in-person boutique-hopping and scattered multi-site online searching.

Shopular builds a mobile app that delivers personalized coupons, deals, and cash-back offers to shoppers as they approach a store or mall. The app replaces the manual work of hunting for discounts before or during a shopping trip by pushing relevant offers automatically based on the user's location. It is available on iPhone and Android and targets everyday retail consumers shopping at their favorite stores.

SlidePay provides an API that lets any app accept in-person credit card payments across platforms and devices. It targets developers and businesses that need point-of-sale payment capability without a lengthy integration, reducing setup from weeks to hours. The product replaces custom payment infrastructure and the complex certification work that typically precedes accepting card-present transactions.

Socialcam builds a mobile video app for iPhone and Android that lets consumers capture, edit, and share personal video moments with friends and family. It replaces the friction of traditional video sharing by handling the entire workflow, from recording to distribution, within a single mobile experience.

SolidStage handles server administration as an outsourced service for businesses, covering deployment, configuration, and monitoring. It replaces the need for in-house sysadmin staff or the manual operational work that engineering teams otherwise absorb. The target customer is a company that wants infrastructure kept running without building a dedicated ops function.

Swiftype builds a search platform for businesses, covering website search, in-app search, and internal enterprise search. It serves teams that need to surface relevant results across public-facing sites, customer-facing documentation, and internal knowledge bases, replacing custom search builds and legacy appliances. Swiftype is part of Elastic.

Talkray (TiKL) builds a push-to-talk mobile app that lets consumers send instant voice and text messages to individuals or groups. It turns any Android or iOS smartphone into a walkie-talkie, replacing the need for traditional cellular calls or separate radio hardware for quick, on-demand communication.

Tap to Learn builds game-based educational apps for children covering math, spelling, grammar, geography, and science from kindergarten through middle school. Each app wraps a single academic concept in a game loop, replacing rote worksheets and passive study with mechanics that reward correct answers with progression. The studio targets kids and parents on iOS, with a catalog of 50-plus titles held to a single quality standard.

The Muse runs a careers marketplace where job seekers, primarily Gen Z and millennial professionals, match with employers based on culture, values, benefits, and team fit rather than job specs alone. Candidates browse inside looks at company culture before applying, replacing the blind-apply model. Employers use the platform to reach candidates who are already self-selected for fit, reducing mis-hires and turnover.

Tilt builds cash advance, credit card, and line-of-credit products for consumers who are underserved by traditional lenders. It evaluates applicants using over 250 financial signals rather than credit scores alone, giving access to short-term credit and revolving credit lines to people conventional scoring would turn away. The product replaces the credit-score gatekeeping that blocks many borrowers from basic lending.

Wave builds a mobile money platform for consumers and businesses across Africa, replacing cash-dependent trips to banks or agents for everyday financial tasks. Users deposit, withdraw, pay bills, and buy airtime through the app, and send money to other people directly from their phones.

WireOver builds a desktop application for transferring large files securely between businesses, using peer-to-peer technology to keep files off third-party servers. It replaces email attachments and cloud storage workarounds for teams that handle sensitive data. Pro accounts add end-to-end encryption for organizations with stricter security requirements.

YourMechanic dispatches certified mobile mechanics directly to a car owner's home or office to handle repairs, maintenance, and diagnostics. The service covers more than 600 job types across the 50 largest U.S. metro areas, replacing the traditional shop visit with on-location service at a transparent, upfront price. A B2B product line extends the same model to business partners across the aftermarket car care lifecycle.

Zillabyte builds a cloud platform that lets sales and analytics teams run large-scale data analysis without managing infrastructure. Developers write and test apps locally, then push to Zillabyte's servers to scale. The platform replaces the work of standing up and maintaining data pipelines, and ships with modular components for geocoding, fraud analysis, and web scraping, plus access to an off-the-shelf dataset that includes a crawl of the web.

Zipio builds a deal search service that helps consumers find discounts and offers across products and merchants. It aggregates deal listings into a single destination, replacing the work of manually browsing multiple retailer sites, coupon pages, or deal forums to find the best available price.