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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CharacterQuilt logo

CharacterQuilt

YCombinator

Computer use agents to deploy enterprise marketing campaigns

CharacterQuilt builds computer use agents to deploy enterprise marketing campaigns. Marketers today don’t actually do much marketing at all. Today, over 80% of time spent on launching a marketing campaign is actually ops work: tweaking automation flows in Pardot, configuring audiences in LinkedIn, or wiring HTML emails in Marketo. What’s crazy about enterprise marketing is companies pay agencies millions of dollars just to deploy campaigns in their systems — and they still have to wait weeks for each one. CharacterQuilt is AI infrastructure for marketing teams: a brain that learns your brand, and agents that operate your existing tools. Marketing campaigns that used to take 3 agencies, 10 tools, and 6 weeks are now being built, designed, and deployed from CQ in an hour. Customers submit a brief like they would send to a human teammate or marketing agency, and they get back fully designed and deployed campaigns. Teams like 1upHealth, ABC Fitness, and Emplifi use us to: 1-) Build segments/audiences faster 2-) Create on-brand creative (AI is terrible at staying on-brand) 3-) Deploy campaigns automatically into HubSpot, WordPress, LinkedIn etc. We replicate your brand guidelines, deeply understand past campaigns, and work inside your systems. If you run demand gen or lifecycle at a B2B/B2C company and want to ship campaigns faster, send us a brief and we’ll build it in 15 minutes.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Chatfuel logo

Chatfuel

YCombinator

Platform to easily create chatbots to engage with audiences on…

We are the largest platform for building bots on Facebook Messenger. Bots are pieces of software that help automate communication with humans through messaging applications. Since messengers have become the most heavily used mobile apps, bots have emerged as effective instruments that are changing the world of digital marketing. Our customers use bots for sales and marketing funnel automation, lead generation and nurturing, customer support and communication. Chatfuel’s bot creators range from small and medium businesses to the world’s most recognizable brands. Some of our largest customers include Adidas, T-Mobile, TechCrunch, LEGO, Golden State Warriors, and many others.

San FranciscoY Combinator LogoWinter 2016ActiveMessagingChatbotsSan Francisco
Checkr logo

Checkr

YCombinator

People infrastructure for the future of work

Checkr builds people infrastructure for the future of work. And we believe everyone should have a fair chance to work. That's why we've designed a faster—and fairer—way to screen job seekers. For more information on our mission and products, visit https://checkr.com.

San FranciscoY Combinator LogoSummer 2014ActiveArtificial IntelligenceComplianceHR TechAPIEnterprise SoftwareSan Francisco
Cheetah logo

Cheetah

YCombinator

Fastest, easiest, and most affordable way for small business owners…

Cheetah is an innovative startup in the tech space.

San FranciscoY Combinator LogoWinter 2013ActiveLogisticsSupply ChainSan Francisco
Chert logo

Chert

YCombinator

iMessage infrastructure for business

Chert provides the infrastructure for businesses to automate conversations over iMessage. We’re already working with B2C startups, customer experience teams, and sales teams to reach end users through trusted and conversational messaging.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Chronicle Labs logo

Chronicle Labs

YCombinator

Staging Environments for Enterprise AI Agents

Chronicle Labs is a staging environment for enterprise AI agents: we capture every event the agent sees in production and backtest it, so customers can safely test new behaviors without breaking anything.

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Cignara logo

Cignara

YCombinator

AI Customer Support for Fortune 500-scale enterprises

Cignara automates the entire revenue cycle - sales and support - across voice and chat - for Fortune 500-scale companies. Companies like LG love us because of our ability to take personalized, agentic actions within their legacy IT systems, in a way that actively drives revenue increases (not just delivers CSAT).

San FranciscoY Combinator LogoSpring 2026ActiveSan Francisco
Circle Medical logo

Circle Medical

YCombinator

Modern primary care via video and in-person

Circle Medical is a venture-backed Y-Combinator healthcare startup on a mission to bring quality, delightful primary care to everyone on the planet. Built by top-tier physicians, engineers, and designers, our medical practice and underlying technology have pioneered how people find and receive care. Our focus on building directly for our patients and providers to address serious care accessibility issues has enabled us to grow over 3X year-over-year. We’re now using our most recent round of funding from WELL Health, backed by Sir Li Ka-shing, to continue building out our hybrid in-clinic and telemedicine model across all fifty states. As we enter the hypergrowth phase, we are looking for deeply motivated team players who are driven to solve some of the biggest challenges in healthcare so that people can live longer and healthier lives. More about us can be found on our website!

San Francisco, CAY Combinator LogoSummer 2015ActiveConsumer Health ServicesPrimary Care
CircuitHub logo

CircuitHub

YCombinator

On-Demand Electronics Manufacturing

CircuitHub offers on-demand electronics manufacturing powered by our factory-scale robotics platform, The Grid. This platform delivers a 10x improvement in the speed and cost of small-batch electronics production. Leading customers like Tesla, NASA, and Zipline rely on CircuitHub to cut their time to market in half.

London, United KingdomY Combinator LogoWinter 2012ActiveHard TechHardwareRoboticsManufacturingAutomation
CircuitLab logo

CircuitLab

YCombinator

Online circuit simulator and electronic schematic editor.

CircuitLab makes it easier for electrical engineers, students, and electronics hobbyists to design, analyze, build, and share electronic circuits.

San FranciscoY Combinator LogoWinter 2013ActiveHardwareSaaSSan Francisco
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