Y Combinator Winter 2015 (W15) Companies

Nimble provides digital workflow and patient engagement software for independent and regional pharmacies, helping them manage prescription fulfillment, mobile checkout, and patient communications. The platform improves medication adherence and enables life sciences companies to access commercial intelligence on therapy adoption.

4 investors

Nomiku makes home sous vide cooking appliances and offers a meal delivery service with pre-portioned ingredients designed for use with their circulator.

3 investors

Notable Labs operates an automated laboratory that tests combinations of existing drugs against individual patients' blood cancer cells to identify effective treatment options for patients whose cancers have become resistant to standard therapies.

6 investors

Numerion combines drug discovery expertise with machine learning and computational chemistry. The company applies AI to drug development.

3 investors

A platform where programmers can collectively annotate and document code snippets with questions, comments, references, and external resources.

1 investor

Open Listings provided a homebuying platform that helped residential buyers purchase properties while reducing their real estate commission costs.

1 investor

Outbound provides a platform for creating and testing automated customer communications across email, push notifications, SMS, and voice channels based on user actions. It enables marketing and product teams to trigger these messages without requiring technical expertise.

1 investor

Pachyderm provides a platform for orchestrating and managing multi-step data workflows, allowing teams to automate sequences of data processing tasks from ingestion through analysis. The tool is designed for organizations seeking to formalize and scale ad-hoc data scripts into reliable production systems.

3 investors

Pakible provides software and manufacturing services that help customers design, price, and order custom product packaging. The platform serves brands across industries including consumer goods, food, and entertainment.

2 investors

Gradient Health builds an open research platform for medical imaging that enables developers to create and validate machine learning algorithms for radiology workflows. The platform provides secure access to production-scenario medical datasets and integrates with PACS vendors to support clinical imaging research.

7 investors

Pigeonly provides technology products that enable families and friends to communicate affordably with incarcerated individuals through low-cost phone calls, photo sharing, letters, postcards, and greeting cards. The company also operates Pigeonly Corrections, which works with correctional facilities to screen incoming mail for contraband while preserving family communication channels.

5 investors

Platzi offers online courses on user research methods and techniques, including qualitative and quantitative approaches, for individuals seeking to master UX research practices.

5 investors

Pomello provides organizational culture assessment software that evaluates team dynamics and integrates with recruitment workflows to identify job candidates likely to succeed within a company's specific culture. The platform draws on decades of organizational behavior research.

1 investor

Popular Pays is an influencer marketing and creator management platform that connects brands with creators for campaign development and execution. The company serves brands seeking to collaborate with content creators aligned with their values.

10 investors

A marketplace connecting brands and non-profits with vetted photographers and videographers for events, portraits, real estate, and product shoots, offering end-to-end services including logistics, editing, and delivery. The company also pioneered a mobile photo booth that captured branded images and collected guest contact information for CRM systems.

1 investor

Priime develops photo editing software for photographers across iPhone, iPad, Mac, and Adobe Lightroom, featuring hand-crafted styles designed by working photographers. The tool emphasizes simplicity, curation, and RAW workflow capabilities over feature complexity.

1 investor

Quantierra uses proprietary software to source, analyze, and execute real estate transactions for institutional investors, non-profit organizations, and other clients. The firm operates in the real estate advisory and transaction execution sector.

1 investor

Qventus provides operations management software for hospitals and healthcare systems to address clinical inefficiencies and reduce clinician burnout. The platform helps healthcare providers optimize their operational workflows across clinical, technological, and regulatory functions.

4 investors

Rare Door operates an ecommerce platform that connects consumers with products available at nearby physical retail locations.

1 investor

Raven Tech develops artificial intelligence and data processing systems, with a focus on next-generation operating system technology.

1 investor

Razorpay provides payment processing APIs and financial services for online merchants, schools, and ecommerce businesses, offering payment acceptance, disbursement, current accounts, and working capital loans. The company serves businesses looking to accept and manage payments online with developer-friendly integration.

9 investors

ReadMe is a developer hub that provides API documentation, monitoring, and developer engagement tools for API-first companies. The platform enables teams to create documentation, monitor APIs in production, and build communities around their developer products.

3 investors

Remix is a platform for public transit agencies to plan, schedule, and visualize transit systems in real-time. It enables collaboration among teams, data-driven decision-making, and multi-modal network management for transit agencies.

3 investors

Replika is an AI companion app that engages users in conversations and provides emotional support through memory, personality customization, and features like voice calls and messaging. The platform serves individuals seeking connection, emotional processing, and personal growth through AI-powered conversations.

5 investors