Y Combinator Summer 2018 (S18) Companies

Mark Cuban Cost Plus Drug Company manufactures affordable generic medications, offering lower-priced alternatives to existing pharmaceutical products.

3 investors

TAB Xchange helps hospitals and healthcare organizations liquidate surplus and used medical equipment. The company provides equipment disposal and sales services for the healthcare sector.

1 investor

MentalHappy is a platform where people find and join expert-led support groups online for grief, anxiety, relationships, parenting, and chronic illness. The platform serves both members seeking support and facilitators (therapists, counselors, coaches, and peer leaders) who run groups with privacy and structure built in.

1 investor

Meru Health delivers digital mental health treatment combining therapy with nutrition, sleep, and breathing interventions. The platform serves individuals seeking evidence-based care for mental health conditions and mood-related challenges.

9 investors

Modern Treasury provides a payments infrastructure platform that enables businesses to move and track money across fiat and stablecoin rails through a single API. The company serves enterprises and financial service providers looking to streamline payment operations across multiple currencies, regions, and payment systems.

9 investors

A space transportation and infrastructure services company providing launch capabilities and orbital logistics for satellites and cargo.

7 investors

Mutiny is an AI-powered GTM assistant that helps customer-facing teams create branded marketing assets, conduct account research, and manage sales workflows. It integrates with tools like email, CRM, and Slack to automate repetitive tasks and enable team collaboration on sales and marketing execution.

4 investors

Mylk Guys was an e-commerce platform that shipped plant-based food and vegan products nationally. The company has shut down operations.

1 investor

Mytos develops automated manufacturing technology for regenerative medicines, specifically targeting the production of stem cell-derived therapies to make treatments for conditions like Parkinson's, blindness, and spinal cord injury accessible and affordable to patients.

10 investors

Names & Faces provides a digital employee directory and people management tool that helps organizations build stronger, more connected teams by making it easy for employees to know each other's names and faces. Originally created as a school yearbook solution, the company now serves enterprises, schools, and communities with a visual, human-centered approach to internal communications.

1 investor

Nestor provides HR teams and managers with software to catalog, evaluate, and assign employees based on their skills, using AI to match workers to internal roles, projects, and upskilling opportunities aligned with business needs.

2 investors

Nova provides software for deal management and data sharing in private markets, serving investors and financial professionals. The company was acquired by AngelList in 2023 and its products were rebranded as AngelList Transact and AngelList Data Room.

3 investors

Numericcal provides machine learning software for detecting anomalies, tracking assets, and managing workforce activities in automotive and manufacturing facilities, processing video and audio data across on-premises and cloud infrastructure to reduce operating costs.

2 investors

OKCredit provides digital bookkeeping and collections management software for small retailers and traders, enabling invoice tracking, customer credit management, and payment reminders via SMS and WhatsApp.

3 investors

A GraphQL API platform that unifies access to multiple third-party services including social networks, development tools, and payment processors through a single interface.

2 investors

OpenWrench provides a maintenance management platform for multi-location retail and commercial businesses to coordinate repairs, track maintenance tasks, and manage vendor relationships across their store network. The platform enables store staff, operations teams, and service providers to communicate in real-time and organize facility maintenance workflows.

1 investor

Optic generates OpenAPI specifications from test traffic and maintains their accuracy through automated schema testing and patch application. It helps API developers catch breaking changes and apply linting rules to their API documentation.

3 investors

OWNY provides enterprise-grade infrastructure for managing private wealth, capital, and payments globally, with core capabilities in USD payments, settlements, and stablecoin clearing for financial institutions. The platform offers real-time compliance controls, direct USD bank accounts, and API-first integration with multiple payment rails.

1 investor

Oxygen was a neobank offering financial products and banking services to small business owners, entrepreneurs, and gig economy workers. The service is currently unavailable as the company pursues new initiatives.

3 investors

Paladin develops autonomous drones and operational software for emergency response and public safety. The company provides first responder agencies with drone technology to improve situational awareness and response times during fires and other emergencies.

5 investors

Papa is a platform that connects older adults and families with trained companion caregivers for in-home companionship and support services. The company addresses social isolation and helps reduce healthcare costs through human connection and community building.

4 investors

Passenger AI develops operations software for autonomous taxi services.

1 investor

Penta Medical makes hardware devices for managing athletic injuries, used by sports teams and medical professionals to monitor athlete health and customize recovery protocols.

1 investor

Perception Biosystems develops automated manufacturing systems for gene therapy production, aiming to reduce the time and cost of producing therapies for rare disease clinical trials.

1 investor