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.

858Companies

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21st logo

21st

YCombinator

Infrastructure and UI building blocks for the agentic internet

21st.dev is the largest React component registry for AI applications, used by 2M developers (370K MAU). We provide the building blocks to create AI agents and agent-powered apps: UI components, agent templates, and an SDK with built-in UI, tools, memory, observability, and managed infrastructure.

San FranciscoY Combinator LogoWinter 2026ActiveSan Francisco
42 logo

42

YCombinator

Analytics stack for omnichannel retailers and brands

42 is an end-to-end analytics stack for DTC and wholesale brands. Our platform shows you the right insights and data, anytime you need them: - Hundreds of built-in metrics across Stores, eComm, Wholesale, or any other channel - See all your sales, stock and customer in one report, with images - Accurate cost, markdown and promo reporting - Get answers in real-time, during your buyer / supplier meetings - Get your store managers to use data, we've seen 10% margin increases from this - Actually know how much stock you have. We're more than just a dashboard... - No infrastructure needed. We do the hosting and maintenance. - No integrations (for you). We do the heavy-lifting and get your data into 42 - For brands, we work with all the major retailers (via xlsx, portals or EDI) - For retailers, we can be your vendor portal - We integrate with any system - We work with you to tailor the analytics according to your products and naming Our customers include AllSaints, Frasers Group, Incipio Group, Bandier, Deconic... and way more. If you want to learn more about what we do, head over to our website: 42technologies.com ... or go to any AllSaints store and ask a store manager :)

San FranciscoY Combinator LogoWinter 2014ActiveSaaSAnalyticsRetailSan Francisco
6thSense logo

6thSense

YCombinator

A nervous system for physical AI

6thSense is an innovative startup in the tech space.

San FranciscoY Combinator LogoSummer 2026ActiveRoboticsBig DataAISan Francisco
7cups logo

7cups

YCombinator

7 Cups is an emotional support service that matches up people that…

7 Cups of Tea is an on-demand emotional health and well-being service. Our bridging technology anonymously & securely connects real people to real listeners in one-on-one chat. Anyone who wants to talk about whatever is on their mind can quickly reach out to a trained, compassionate listener through our network. We have hundreds of listeners who come from all walks of life and have diverse experiences. People connect with listeners on 7 Cups of Tea for all kinds of reasons, from big existential thoughts to small, day-to-day things that we all experience. Unlike talking to family or friends, a 7 Cups of Tea listener doesn’t judge or try to solve problems and say what to do. Our listeners just listen. They understand. They give you the space you need to help you clear your head.

Virginia Beach, VAY Combinator LogoSummer 2013ActiveMental Health Tech
80,000 Hours logo

80,000 Hours

YCombinator

An online guide that tells talented graduates how to maximise the…

We provide research and support to graduates who want to use their careers to make a big positive impact in the world. We have an online guide that tells you new ways to make an impact, and one-on-one advice & introductions to help people take action.

London, United KingdomY Combinator LogoSummer 2015ActiveNonprofit
83 Sciences logo

83 Sciences

YCombinator

AI-native materials discovery powered by unpublished experimental data

83 Sciences uses AI to mine discarded experimental data and drive scientific breakthroughs. Working alongside labs, we discover the materials that will power the new Industrial Revolution.

San FranciscoY Combinator LogoSummer 2026ActiveHard TechAdvanced MaterialsAISan Francisco
9 Mothers logo

9 Mothers

YCombinator

Counter Drone Systems. $1.6m sales. We delivered for the DoW.

We have sold $1.6m of systems to the DoW. Multiple systems delivered to the DoW. Our first product - EDDA - is a counter drone system - small, low power, low cost fully autonomous-capable. It's designed to be used on vehicles, bases, or carried - to stop group 1 suicide drones. We have multiple contracts, sales, etc. We have 3 more products with demand in various stages of development. More details at https://9mothers.com

Austin, TXY Combinator LogoSpring 2026ActiveAustin
9gag logo

9gag

YCombinator

Make the world happier.

9GAG is the global cross-platform entertainment media network. It is a place for fun, conversation, and engagement. Founded in 2008, 9GAG’s mission is to make the world happier. 9GAG has a total of 150 million global audience with 39 million followers on Facebook, 44 million on Instagram and 15 million on Twitter. Being #1 ranked global social media platform in entertainment & gaming, #1 ranked US's cross-platform video creators, we distribute 2.2 billion social video views on a monthly basis (source: tubular labs). 9GAG.com is #6 most followed brand on Instagram and is a top 200 website globally. 9GAG is backed by: Freestyle Capital, True Ventures, First Round Capital, Greycroft Partners, 500 Startups, Y Combinator and a group of great angel investors in the United States. eg Anthony Soohoo, Benjamin Ling, BoxGroup, Gary Vaynerchuk, James Hong, Kevin Rose, Karl Jacob, Lowercase Capital, Maneesh Arora, Naval Ravikant, Othman Laraki, Philip Kaplan, Rich Chen, Rich Lefurgy, Scott and Cyan Banister, Tim Ferriss.

Hong Kong, Hong KongY Combinator LogoSummer 2012ActiveSocial MediaSocialSocial Network
AbInitio Bio logo

AbInitio Bio

YCombinator

The Intelligence layer for Drug Manufacturing

Abinitio Bio builds foundation models for biomanufacturing, validated against wet lab data. Our first model, Echo, predicts manufacturing outcomes more accurately than standard models, and any pharma or CDMO can adapt it to their own workflow instantly. By making process decisions that take 6-18 months today in hours, we help teams avoid the cost of delay on a single program.

BostonY Combinator LogoSpring 2026ActiveBoston
Absurd logo

Absurd

YCombinator

The Creative OS for AI video

Absurd makes AI brand and performance ads at scale. Our last video for Kalshi ("Election Day") did 1M+ views, and our videos average 400K+ organic views. Companies like Hims, Kalshi, Replit, and Brex use Absurd to create production-quality videos in 72 hours. Try it at absurd.com

Los Angeles, CAY Combinator LogoFall 2025ActiveGenerative AIVideoMediaMarketingAdvertisingLos Angeles
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