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

VC Backer

All VCsYCombinator

Industry

All IndustriesB2BMarketplaceTravelFintechConsumerHealthcareEducationIndustrialsReal Estate and ConstructionGovernmentUnspecified

Employees

Any Size1-1011-5051-200201-500501+

Stage

Any StagePre-SeedSeedSeries ASeries BSeries C+

Raised

Any Amount< $1M$1M - $5M$5M - $20M$20M+
/
SortA-Z
Luel logo

Luel

YCombinator

Turning everyday words and actions into usable training data.

Luel is a sourcing and licensing platform for rights-cleared multimodal training data at scale. We work with frontier AI teams to provide high-quality bespoke data collections and off-the-shelf datasets.

San FranciscoY Combinator LogoWinter 2026ActiveSan Francisco
Lugg logo

Lugg

YCombinator

Move anything, anytime, anywhere

Lugg is building the best way for you to get anything moved. With the push of a button, you are connected to movers and a truck. They make it dead simple to get your new furniture home, your craigslist purchases delivered to you, and moving all of your stuff into your new apartment. They are located in San Francisco and well-funded by some of the greatest investors in the world, like A-Capital, Sequoia Capital, SV Angel, and Y Combinator. They are a small team with incredibly hard problems to solve. They are hiring and would love to hear from you! hello@Lugg.com Download Lugg and let them be your friend with a truck! http://lugg.com

San FranciscoY Combinator LogoSummer 2015ActiveLogisticsSan Francisco
LunaBill logo

LunaBill

YCombinator

AI Voice callers for healthcare billing teams

LunaBill is building AI Voice callers for healthcare billing teams. Insurance claim follow-up calls account for the 80% of the daily workload of a healthcare billing team, with each call averaging 30 minutes. Since our launch in July we are now at $764K in contracted ARR, of which $428K is live revenue and the rest will go live by January 2026. Our customers see a 10x increase in claims followed up per biller in the first week and we have converted 100% of pilots to paying customers. We have automated 50,000+ calls and signed partnerships with top healthcare leaders like UC health systems, Mayo, Experian Health and more. The founders have known each other for over a year. Suhail is a 2x founder, with 3+ years of experience building in healthcare including operating a medical billing company with 200+ healthcare clients. David founded Skiesoft, Taiwan’s biggest healthcare AI scribe company, used by thousands of healthcare professionals. He also worked as a data scientist at UCSF, building models to audit medical-coding accuracy. Yash was a researcher at various hospital systems including Mayo Clinic.

San FranciscoY Combinator LogoFall 2025ActiveArtificial IntelligenceGenerative AIHealth TechHealthcareHealthcare ITSan Francisco
Machine Zone logo

Machine Zone

YCombinator

Pioneers of mobile social gaming.

Live data powers everything we do—from our global, multiplayer mobile games to our mobile ad buying to our live data ecosystem, Satori. MZ is creating new futures for people, enterprises, cities, and countries. The possibilities are endless.

San FranciscoY Combinator LogoWinter 2008AcquiredGamingSan Francisco
machine0 logo

machine0

YCombinator

Persistent & powerful cloud VMs from your CLI

machine0 is a CLI that lets you create, provision, and snapshot cloud VMs. `machine0 new my-vm` spins up a VM with dedicated CPU, RAM, and optional GPUs, plus a static IP and HTTPS endpoint. The tools agents need (e.g. Node, Python, Docker) and the agents themselves (e.g. Claude Code, Codex, OpenClaw, Hermes) come pre-installed. 99.99% VM uptime SLA across four regions. Agent workloads are moving from ephemeral to always-on. A coding agent debugging a complex issue runs 4-8 hours. OpenClaw runs 24/7. machine0 is the environment in which these agents run.

San FranciscoY Combinator LogoSummer 2026ActiveDeveloper ToolsCloud ComputingSan Francisco
MadeThis logo

MadeThis

YCombinator

The autonomous business platform

MadeThis is an innovative startup in the tech space.

San FranciscoY Combinator LogoFall 2025ActiveOperationsAISan Francisco
Madrone logo

Madrone

YCombinator

Hyper-efficient coolers for data centers

Madrone builds cooling systems for data centers. In Texas, where most new sites are, Madrone can cool using 30% less power and water, thanks to novel dew-point cooling technology.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Magic logo

Magic

YCombinator

Extremely talented assistants for busy people

Magic is the most convenient way to access quality virtual assistants to scale your business.

Washington, DCY Combinator LogoWinter 2015ActiveB2BAI Assistant
MagicBus logo

MagicBus

YCombinator

We make vanpool simple.

Our mission is to take cars off the road by making it safe and easy to vanpool in the post Covid world. A vanpool is a group of people who commute together, usually in a shared van. It’s an excellent, cost effective way to commute, used by hundreds of thousands of Americans, but the industry is largely offline. It’s difficult to find, join, and start vanpools. We build software that fixes this, making vanpooling simple and flexible. We believe that in a post Covid world, it will be more important than ever to rethink shared transportation and make it more adaptive. Our customers are organizations like transit agencies and employers who have existing vanpool fleets. We provide these customers with our SaaS platform that manages their vanpool programs. We capture real time information about open seats, then make those seats available to book through our app. We also make it easy for people to crowdsource and start new vanpools.

Los Angeles, CAY Combinator LogoWinter 2016ActiveTransportationLos Angeles
Magnetic logo

Magnetic

YCombinator

AI Tax Preparer for CPA firms

Magnetic scans client documents - from handwritten charity notes to excel spreadsheet Schedule Cs to multi-state K-1s - and enters them into tax software automatically, saving hours of tedious data entry. The accounting profession is facing a massive talent shortage, as graduates choose different professions and the old guard begins to retire. As a result, CPA and tax preparation firms are awash in clientele, but unable to keep up. At many firms, phones go unanswered, clients are "fired", and websites are taken down, as the existing workforce tries to handle the grueling 80 hour+ weeks necessary to push through tax season to the April 15th deadline. We built this because a former colleague who owns her own tax firm asked us to automate her workload, and we quickly realized the massive opportunity. Thomas brings deep domain expertise as the former Head of Product at Keeper (YC W19), where he built tax engine automation systems and an OCR form scanning system that outperformed everything else on the market. At Keeper, he leveraged early access to OpenAI's LLMs (well before ChatGPT) to build systems that automated the entire tax filing process, allowing a tiny team of CPAs to process thousands of returns with near zero busy work. Patrick was the first engineer at FunCraft, shipping multiple mobile games with 1M+ downloads and building scalable shared codebases. We've worked together since 2017, including co-leading multiple teams at Zynga as PM & Tech Lead respectively. The opportunity is massive - there are 80M US personal tax returns filed via professionals annually, in a $2B outsourcing market where individual CPA firms currently pay $100k-$1M per year for inferior services. We're positioned to capture significant market share by offering better accuracy & document coverage, instant processing, and superior user experience. We've built this kind of software before, we've worked together for years (and even lived together), we've built products to $10M ARR before, and we have the grit to outwork anyone in this space.

San FranciscoY Combinator LogoSummer 2025ActiveSan Francisco
PreviousPage 46 of 92Next