Founders Directory LogoFounders Directory

Discover the next generation of startups.

A curated directory of high-growth companies backed by the world's most prestigious venture capital firms.

914Companies

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PartnerStack logo

PartnerStack

YCombinator

PartnerStack is a full stack solution for partnerships.

The platform supports partner marketing, referral, and reseller activity, and solves for partner application management, engagement, attribution, education, payouts, compliance, and additional partner channel needs. Companies using PartnerStack have their program listed in PartnerStack's marketplace, exposing their program to a growing network of +450,000 partners. These companies see a +30% revenue increase in their partner channels due to partners acquired through PartnerStack's network. The network allows partners to sell multiple SaaS applications from a single platform - a necessity for integrated SaaS solutions investing in channel. The most trusted and fastest growing SaaS companies in the world are turning to PartnerStack to support their channel growth, including Intuit, Asana, Freshworks, Zendesk, Aircall, Intercom, and more.

Toronto, CanadaY Combinator LogoSummer 2015ActiveMarketplaceSaaSB2B
Patent Watch logo

Patent Watch

YCombinator

AI for detecting patent infringements

We automate patent infringement detection. Our software interprets patents, identifies competing products, and generates claim charts showing who’s infringing and how. Teams use us to: - Find licensing and litigation targets - Send cease-and-desist letters - Find counter litigation - Sell IP in wind-downs - Accelerate M&A diligence We also run AI invalidity and prior-art searches to help your patents hold up in court. Companies spend up to $50k to file and maintain a single patent over its lifetime, but once it's granted, they let it collect dust. With Patent Watch, you can start turning your patent portfolio into revenue in 10 minutes.

RomaniaY Combinator LogoFall 2025ActiveArtificial IntelligenceSaaSB2BLegalLegalTech
Patientdesk.ai logo

Patientdesk.ai

YCombinator

AI front & back office agent for dental practices

Patientdesk is an AI bookings system that helps healthcare practices make more money. We do this by handling bookings, payments, and insurance to fill up a provider's calendar with high value appointments.

San Francisco, CAY Combinator LogoWinter 2026Active
Pavoot logo

Pavoot

YCombinator

AI Event Manager for in-person events

Pavoot is an AI event manager for companies that run in-person customer events. More and more companies are investing in dinners, summits, and community events because relationships drive revenue. But today, running events means sourcing attendees, sending invitations, hosting the event, and then manually digging through notes, emails, and spreadsheets afterward to figure out who attended, what was discussed, who is a strong lead, and who should be followed up with. Most teams either send generic "thanks for coming" emails or never properly capture the value created during the event. Pavoot replaces this fragmented workflow with a single AI system that keeps every attendee, interaction, conversation, and follow-up connected in one place, making relationship-driven growth scalable. Gohar and Ana met while studying Computer Science at ETH Zurich. Gohar is a six-time Swiss chess champion and was the youngest member of Switzerland’s national chess team at age 13. Ana won more than 20 medals in scientific Olympiads, ranked 1st in CS at Latin America’s most competitive university, and built internal AI systems used by hundreds of data scientists at some of the largest banks in Latin America before moving to ETH Zurich for AI research. === Book a demo: pavoot.com

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Pax Historia logo

Pax Historia

YCombinator

The first AI-powered grand strategy platform

Pax Historia is an alternate-history sandbox game where players choose a country, a moment in time, and rewrite the course of history. What if Rome never fell? What if the Soviet Union survived? What if Genghis Khan ruled for another generation? We go beyond history, too. What if aliens invaded Earth? What if you were a college dropout creating a tech startup? The ability to create, edit, and copy custom maps, actors, historical context, and more means that users can play nearly any scenario they can imagine. In the last four months we've organically built a passionate fanbase of tens of thousands of daily active players and we're excited to expand on this early start. Consider joining us to help build vastly better tools for creators and experiences for players.

San FranciscoY Combinator LogoWinter 2026ActiveSan Francisco
Payna logo

Payna

YCombinator

AI Licensing Agent for Regulated Industries

Payna is building the AI licensing agent for regulated companies. We automate the filings, renewals, amendments, and regulator follow ups required to get licensed and stay licensed across jurisdictions, so teams no longer have to manage compliance through spreadsheets, email threads, and expensive outside firms. Starting with financial services categories like lending, debt collection, and money transmission, Payna helps companies move faster, stay compliant, and scale without adding compliance headcount linearly.

San FranciscoY Combinator LogoWinter 2026ActiveSan Francisco
Paystack logo

Paystack

YCombinator

Modern payments infrastructure for Africa

Paystack is a small and vibrant family working across Lagos and San Francisco. We enable businesses to accept payments via credit card, debit card, money transfer, and mobile money, directly from their website or mobile app.

Lagos, NigeriaY Combinator LogoWinter 2016AcquiredFintech
Pentagon logo

Pentagon

YCombinator

The control plane for agent-native work.

Pentagon is a workspace for your AI employees to communicate, coordinate, and get work done as a team.

Salt Lake City, UTY Combinator LogoSpring 2026Active
Per Vices logo

Per Vices

YCombinator

Building Mission Critical Software Defined Radio products.

Per Vices builds the highest performing Software Defined Radios for mission critical applications for industries that can't live without them. Our products are modular, easy to use, provide the best possible performance, and replace a number complex sub-systems and components. Customers developing wireless applications use our products because they dramatically lower integration and development complexity, total cost of ownership, and time to market. Our proprietary, industry leading, technology provides the best performance and maintains an efficient abstraction layer that allows customers to easily incorporate our product into their application.

Toronto, CanadaY Combinator LogoWinter 2012ActiveHardwareIoTTelecommunicationsDefense
PerfectBit, Inc. logo

PerfectBit, Inc.

YCombinator

Correct by construction AI training data

We create a new kind of data for training AI models. Most LLMs are pre-trained on noisy web-scraped text, but they hallucinate and still fail on tasks that humans find trivial. PerfectBit creates high-quality training data that's correct by construction. We verify against physics simulators, scientific databases, formal proof systems. LLMs, robotics, AI for Science, and more.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
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