Find the Right YC Founders. Reach Out Better.
Search 900+ YC startups, find the right founders, and send personalized cold DMs in minutes.
Onsite Pro
Revolutionizing digital selling within HVAC
We make contractor proposal creation as simple as checking out of e-commerce. We equip HVAC distributors (who sell HVAC equipment to contractors) with digital catalogs preloaded with pricing, product details, and templates that allow contractors to create a professional proposal in under 10 minutes and sell in-person.
Ontora
AI agents that interviews every employee to hand context to AI tools.
Ontora is an AI Agent that interviews every employee to map how work actually gets done and identify bottlenecks. Consultants spend months doing this manually; Ontora does it in hours.
Ontra Mobility
Platform for cities to optimize transit
Ontra Mobility is founded by two former Googler engineers with PhDs in operations research. Ontra helps cities and other transit agencies increase ridership through data-driven planning and real-time optimization. The founders developed the software that powered MARTA Reach in Atlanta, GA and CAT SMART in Savannah, GA.
Onward
Intelligent meeting automation for ambitious teams.
Onward is a new take on conversational intelligence. We streamline follow-ups, CRM updates, ticket creation, and other tasks after every meeting—helping you connect this knowledge to the rest of your tools.
Ooak Data
We build the world's largest library of real-world business workflow…
The promise of AI agents is still unmet in complex, real-world business environments. Our mission is to make it possible for agents to reliably accomplish concrete and useful tasks. That’s why we're building **Alexandria,** the world's largest library of real-world business workflow datasets.
Oolu
Oolu is one of the fastest growing off-grid solar firms in West Africa
Oolu was founded by Nilmi Senaratna and Dan Rosa in 2015. The company's mission is to provide off-grid households in rural regions in Africa with high quality products at an affordable price. In Wolof, a national language of Senegal, Oolu means ‘trust.’
Opalite Health
Helping Healthcare Providers Speak Any Language
Opalite makes it easy for healthcare providers to communicate with non-English speaking patients. We’re built to work inside existing clinical workflows, so providers can communicate in real time without waiting for an interpreter or delaying care. Opalite is available instantly, 24/7, and replaces traditional interpretation services with software that’s more reliable and saves millions of dollars per year. We've built a voice AI system that is the safest, most compliant, and most accurate medical interpreter in the world.
Openbase
Open-source library discovery
Openbase was the leading platform for developers to discover and choose open-source libraries. It offered countless reviews, metrics, and insights enjoyed by millions of developers worldwide. Discontinued in 2023.
Openbenchmarks
We help humans & agents pick tools via Independent Benchmarks
Openbenchmarks runs open, independent benchmarks across APIs, vendors and tools. Helping teams fairly evaluate vendors. We offer private benchmarking & analytics tools to help you measure your product against competitors, see exactly where you fall short, and fix it.