Y Combinator Startups in the San Francisco Bay Area 2025

December 2025

Browse 2036 of the top startups funded by Y Combinator. Headquartered in the San Francisco Bay Area, these are some of the hottest and fastest-growing startups. This doesn't include all companies originally founded in San Francisco Bay Area or by founders from there.

We also have a Startup Directory where you can search through over 5,000 companies.

  • Deel
    Deel
    Y Combinator LogoW2019
    Active • 5,000 employees • San Francisco, CA, USA
    Deel is the all-in-one payroll and HR platform for global teams. Built for the way the world works today, Deel combines HRIS, payroll, compliance, benefits, performance, and equipment management into one seamless platform. With AI-powered tools and a fully owned payroll infrastructure, Deel supports every worker type in 120+ countries—helping businesses scale smarter, faster, and more compliantly. Discover how Deel makes global work simple at deel.com.
    hr-tech
    b2b
    saas
    payroll
    fintech
  • Newfront
    Newfront
    Y Combinator LogoW2018
    Active • 800 employees • San Francisco, CA, USA
    Newfront is building the modern insurance brokerage. Transparent data delivered real-time translates into a lower total cost of risk and greater insights. We work with 20% of US unicorns, 100s of YC startups, and 150+ public companies on their Business Insurance and Total Rewards. Headquartered in San Francisco, Newfront has more than 800 colleagues and offices throughout the US.
    insurance
    fintech
  • Brex
    Brex
    Y Combinator LogoW2017
    Active • 1,000 employees • San Francisco, CA, USA
    Brex is the AI-powered spend platform for modern companies, from startups to enterprises. Combining corporate cards, expense management, travel, business accounts, and bill pay, Brex makes it easy to control spend before it happens with unprecedented efficiency and accuracy. Our mission is to empower employees anywhere to make better financial decisions, so we designed our platform to make expenses almost effortless with unrivaled automation of manual expense work and real-time tracking. Brex supports more countries and currencies than any other spend solution. Brex has tens of thousands of customers, including some of the most successful, high-growth companies, such as DoorDash, SeatGeek, Coinbase, ScaleAI, MasterClass, Indeed, Allbirds, and Superhuman. Brex offers: - Corporate cards with 10-20x higher limits - Business accounts with easy wires, same-day liquidity, fast global payments, and $6M in FDIC insurance - Reward options that include billboards, offsites, and coaching - Founder-friendly financial modeling tools - Special events and masterclasses for founders - Advanced spend management software as startups grow that includes global capabilities, travel, bill pay and more.
    fintech
  • Faire
    Faire
    Y Combinator LogoW2017
    Active • 900 employees • San Francisco, CA, USA
    Faire is an innovative online marketplace that uses machine learning to match local retailers with the brands and products that uniquely fit their stores. We are using the power of technology to connect brands and independent retailers from all over the world, building a thriving community of hundreds of thousands of retailers, which has resulted in over 7 million new connections to date. Faire was founded on the belief that the future of retail is local. Our mission is to empower brands and retailers to strengthen the unique character of local communities. Our data-driven approach unburdens retailers from decades-old obstacles by helping find the right products for their shop. Plus, our straight-forward financial terms level the playing field by eliminating inventory risk and providing access to capital—key offerings previously only available to big box chains. For brands, our platform provides powerful sales, marketing, and analytics tools that simplify their business and allow them to focus on what they love: making great products.
    marketplace
    retail
  • Clipboard
    Clipboard
    Y Combinator LogoW2017
    Active • 800 employees • San Francisco, CA, USA
    We exist to lift as many people up the socioeconomic ladder as possible. We dramatically improve lives by letting professionals turn extra time and ambition into career growth and financial opportunity. We achieve this with our app-based marketplace that connects workplaces and professionals, allowing professionals to book on-demand shifts and workplaces to access on-demand talent.
    health-tech
    healthcare
    consumer-health-services
    marketplace
  • Rippling
    Rippling
    Y Combinator LogoW2017
    Active • 2,500 employees • San Francisco, CA, USA
    Rippling gives businesses one place to run HR, IT, and Finance. It brings together all of the workforce systems that are normally scattered across a company, like payroll, expenses, benefits, and computers. For the first time ever, you can manage and automate every part of the employee lifecycle in a single system. Take onboarding, for example. With Rippling, you can hire a new employee anywhere in the world and set up their payroll, corporate card, computer, benefits, and even third-party apps like Slack and Microsoft 365—all within 90 seconds. Based in San Francisco, CA, Rippling has raised $1.2B from the world’s top investors—including Kleiner Perkins, Founders Fund, Sequoia, Greenoaks and Bedrock.
    hr-tech
  • Scale AI
    Scale AI
    Y Combinator LogoS2016
    Active • 500 employees • San Francisco, CA, USA
    Scale accelerates the development of AI within organizations of any size to deliver critical business insights and operational efficiency. Its data-centric infrastructure platform leverages RLHF (Reinforced Learning with Human Feedback) to help organizations build the strongest AI models that supercharge their business, with customers across industries including Meta, Microsoft, U.S. Army, DoD’s Defense Innovation Unit, Open AI, General Motors, Toyota Research Institute, Brex, Instacart and Flexport.
    artificial-intelligence
    machine-learning
  • Go1
    Go1
    Y Combinator LogoS2015
    Active • 650 employees • San Francisco, CA, USA
    In today’s environment, employees need training to ensure business compliance, skill development and to support an engaged workforce. Go1 brings together content from the world’s top training providers and makes it easy to access in whichever platform your organization uses. This makes it easier to deliver, manage and engage with training. Go1 also works with existing LMS, HRIS, and business systems to make learning simpler and more effective.
    elearning
  • GitLab
    GitLab
    Y Combinator LogoW2015
    Public • 2,000 employees • San Francisco, CA, USA
    GitLab is the first single application for the entire DevOps lifecycle. Only GitLab enables Concurrent DevOps, unlocking organizations from the constraints of today’s toolchain. GitLab provides unmatched visibility, radical new levels of efficiency and comprehensive governance to significantly compress the time between planning a change and monitoring its effect. This makes the software lifecycle 200% faster, radically improving the speed of business. GitLab and Concurrent DevOps collapses cycle times by driving higher efficiency across all stages of the software development lifecycle. For the first time, Product, Development, QA, Security, and Operations teams can work concurrently in a single application. There’s no need to integrate and synchronize tools, or waste time waiting for handoffs. Everyone contributes to a single conversation, instead of managing multiple threads across disparate tools. And only GitLab gives teams complete visibility across the lifecycle with a single, trusted source of data to simplify troubleshooting and drive accountability. All activity is governed by consistent controls, making security and compliance first-class citizens instead of an afterthought. Built on Open Source, GitLab leverages the community contributions of thousands of developers and millions of users to continuously deliver new DevOps innovations. More than 100,000 organizations from startups to global enterprise organizations, including Ticketmaster, Jaguar Land Rover, NASDAQ, Dish Network and Comcast trust GitLab to deliver great software at new speeds.
    open-source
    developer-tools
    devsecops
  • GrubMarket
    GrubMarket
    Y Combinator LogoW2015
    Active • 4,548 employees • San Francisco, CA, USA
    GrubMarket is the AI-powered technology enabler and digital transformer of American Food Supply Chain industry. Our mission is to build and provide the eCommerce and software technologies to this industry, to transform this completely offline and highly manual industry into modernized online industry powered by software technologies, and improve the efficiency of American food supply chain.
    agriculture
    food-tech
    e-commerce
    supply-chain
  • Oklo
    Oklo
    Y Combinator LogoS2014
    Public • 50 employees • Santa Clara, CA, USA
    About Oklo Inc.: Oklo Inc. (Oklo) is developing advanced fission power plants to provide emission-free, reliable, and affordable energy. Oklo received a Site Use Permit from the U.S Department of Energy, has performed successful prototypic fuel fabrication, was awarded fuel material from Idaho National Laboratory, developed the first advanced fission combined license application accepted and docketed by the U.S. Nuclear Regulatory Commission, and is developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and national laboratories. Oklo has been featured in Time, Newsweek, Wall Street Journal, CNBC, Popular Mechanics, Wired, Architectural Digest, Hyperallergic, POWER Magazine, has been the subject of a Harvard Business School case, and is featured in the Oliver Stone documentary Nuclear, among other features.
    climate
    small-modular-reactors
  • Checkr
    Checkr
    Y Combinator LogoS2014
    Active • 800 employees • San Francisco, CA, USA
    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.
    compliance
    enterprise-software
    api
    hr-tech
    artificial-intelligence
  • Algolia
    Algolia
    Y Combinator LogoW2014
    Active • 810 employees • San Francisco, CA, USA
    Our mission is to make every search interaction meaningful & rewarding, through developer-friendly and enterprise-grade APIs. Algolia is the leading Search & Discovery API for websites and mobile apps. We help the most innovative companies across e-commerce, media and SaaS industries create powerful, relevant and scalable discovery experiences for their users. Unlike other solutions, our hosted platform reduces the complexities of building and scaling a fast, relevant digital experience and helps teams accelerate development time. More than 9,000 companies like Under Armour, Twitch, Periscope, Medium and Stripe rely on Algolia to manage 50+ billion search queries a month. Founded in 2012, we're backed by $184M in funding from Accel Partners, Alven Capital, Point Nine Capital and Storm Ventures. The team is headquartered in San Francisco with offices in Paris, London, New York, and Atlanta. To learn more, visit www.algolia.com. --- We’re looking for talented, passionate people to build the world’s best search technology. As an ownership-driven company, we seek team members who thrive under autonomy and diversity. We're committed to building an inclusive and diverse workplace. We care about each other and the world around us, and embrace talented people regardless of their race, age, ancestry, religion, sex, gender identity, sexual orientation, marital status, color, veteran status, disability and socioeconomic background
    developer-tools
    saas
    b2b
  • Flexport
    Flexport
    Y Combinator LogoW2014
    Active • 3,000 employees • San Francisco, CA, USA
    Founded in 2013, we believe trade can move the human race forward. That’s why our mission at Flexport is to make global trade easy for everyone. What the internet has done for bits and bytes, Flexport is doing for physical goods: giving every business the ability to connect to any customer, wherever they are in the world. That sounds pretty straightforward, but a fragmented and inefficient global supply chain has held the world back from untapped growth and innovation. By connecting everyone in the global economy we can unlock commerce, creativity, and human progress. To do so, we’re building the platform for global logistics—empowering buyers, sellers and their logistics partners with the technology and services they need to grow and innovate. Today, we work with more than 40,000 customers and their suppliers across industries like manufacturing, retail, electronics, consumer goods, tech, apparel, and beauty. Companies of all sizes—from emerging brands to Fortune 500s—used Flexport technology to move nearly $19B of merchandise across 112 countries in 2021. Interested in joining our team? Check out our open job postings on careers site and apply directly today! https://www.flexport.com/careers/jobs/
    supply-chain
    saas
    logistics
  • Bellabeat
    Bellabeat
    Y Combinator LogoW2014
    Active • 134 employees • San Francisco, CA, USA
    Founded in 2014, Bellabeat is a data-centered wellness femtech company behind some of the most fashionably designed tech-powered wellness products and one of the fastest-growing wellness subscription services for women. Throughout the years, Bellabeat built the go-to wellness brand with a compelling ecosystem of solutions and services focused on women’s health. The success of the Leaf and Ivy wearables enabled the brand to expand to international markets and kickstart industry discussions on the importance of innovating in the design and development of tech products. Today, Bellabeat is leading the market shift with hyper-personalized holistic wellness offerings aligned with a women’s menstrual cycle.
    femtech
    fitness
    health-&-wellness
  • Webflow
    Webflow
    Y Combinator LogoS2013
    Active • 600 employees • San Francisco, CA, USA
    Webflow is the leading no-code visual web development platform. It seamlessly generates sophisticated code so anyone can build powerful web-based businesses and adapt to changes without developers or months of building. From entrepreneurs and creative agencies to Fortune 500 companies, Webflow makes the internet a more inclusive place by making the tools to build on it more accessible to more people, fueling business growth. Webflow powers websites for innovators like Discord, Monday.com, IDEO, Orange Theory Fitness, TED, and Dropbox. Webflow is backed by Y Combinator, Accel, CapitalG, Silversmith, and other awesome investors.
    saas
    marketing
    design
  • DoorDash
    DoorDash
    Y Combinator LogoS2013
    Public • 8,600 employees • San Francisco, CA, USA
    Founded in 2013, DoorDash is a San Francisco-based technology company passionate about transforming local businesses and dedicated to enabling new ways of working, earning, and living. Today, DoorDash connects customers with their favorite local and national restaurants in more than 600 cities across the United States and Canada. By building intelligent, last-mile delivery technology for local cities, DoorDash aims to connect people with the things they care about — one dash at a time. Read more at blog.doordash.com, and find us on Glassdoor.
    e-commerce
    marketplace
  • Fivetran
    Fivetran
    Y Combinator LogoW2013
    Active • 1,200 employees • Oakland, CA, USA
    Fivetran automates data movement out of, into and across cloud data platforms. We automate the most time-consuming parts of the ELT process from extracts to schema drift handling to transformations, so data engineers can focus on higher-impact projects with total pipeline peace of mind. With 99.9% uptime and self-healing pipelines, Fivetran enables hundreds of leading brands across the globe, including Autodesk, Conagra Brands, JetBlue, Lionsgate, Morgan Stanley, and Ziff Davis, to accelerate data-driven decisions and drive business growth. Fivetran is headquartered in Oakland, California, with offices around the world. 
    data-engineering
    saas
    analytics
    b2b
  • Instacart
    Instacart
    Y Combinator LogoS2012
    Public • 3,000 employees • San Francisco, CA, USA
    Instacart is the North American leader in online grocery and one of the fastest-growing companies in e-commerce. Instacart’s same-day delivery and pickup services bring fresh groceries and everyday essentials to busy people and families across the U.S. and Canada in as fast as an hour. Since its founding in 2012, Instacart has become an essential service for millions of families, while also serving as an immediate, flexible earnings opportunity for hundreds of thousands of shoppers across North America. The company partners with more than 350 retailers and delivers from more than 25,000 stores across more than 5,500 cities in North America. Today, Instacart is accessible to more than 85% of households in the U.S. and more than 70% of households in Canada.
    e-commerce
    grocery
    delivery
  • Benchling
    Benchling
    Y Combinator LogoS2012
    Active • 750 employees • San Francisco, CA, USA
    Biotechnology is rewriting life as we know it, from the medicines we take, to the crops we grow, the materials we wear, and the household goods that we rely on every day. Biotech R&D is radically transforming our world, but to move at the new speed of science, scientists need better technology. Benchling’s mission is to unlock the power of biotechnology. The world’s biotech leaders and innovators use our R&D Cloud to power the development of breakthrough products and accelerate time to milestone and market.
    b2b
    saas
    biotech
  • Zapier
    Zapier
    Y Combinator LogoS2012
    Active • 700 employees • Mountain View, CA, USA
    Founded in 2011, Zapier is the #1 workflow automation platform for small and mid-sized businesses. By connecting more than 6,000 of the most popular work apps, Zapier empowers its users to make the most of the tools they already use—and to focus on what matters most.
    saas
    b2b
    automation
  • Coinbase
    Coinbase
    Y Combinator LogoS2012
    Public • 6,112 employees • San Francisco, CA, USA
    Founded in June of 2012, Coinbase is a digital currency wallet and platform where merchants and consumers can transact with new digital currencies like bitcoin, ethereum, and litecoin. Our vision is to bring more innovation, efficiency, and equality of opportunity to the world by building an open financial system. Our first step on that journey is making digital currency accessible and approachable for everyone. Two principles guide our efforts. First, be the most trusted company in our domain. Second, create user-focused products that are easier and more intuitive to use.
    crypto-web3
  • Scribd
    Scribd
    Y Combinator LogoS2006
    Active • 300 employees • San Francisco, CA, USA
    Scribd gives you access to millions of ebooks, audiobooks, magazines, podcasts, and more — all in one place, for one price. OUR VISION Inspire the world through stories and knowledge. OUR MISSION Build the largest and most accessible library connecting storytellers with their audience. If you love working with smart, motivated people, you’ll love working at Scribd. We value our employees, we demonstrate accountability, and we take action. We’re one team with a common goal: helping our customers flourish.
    ai-enhanced-learning
    edtech
    remote-work
  • Dropbox
    Dropbox
    Y Combinator LogoS2007
    Public • 4,000 employees • San Francisco, CA, USA
    Dropbox is building the world’s first smart workspace. Back in 2007, making work better for people meant designing a simpler way to keep files in sync. Today, it means designing products that reduce busywork so you can focus on the work that matters. Most “productivity tools” get in your way. They constantly ping, distract, and disrupt your team’s flow, so you spend your days switching between apps and tracking down feedback. It’s busywork, not the meaningful stuff. We want to change this. We believe there’s a more enlightened way to work. Dropbox helps people be organized, stay focused, and get in sync with their teams.
  • Airbnb
    Airbnb
    Y Combinator LogoW2009
    Public • 6,132 employees • San Francisco, CA, USA
    Founded in August of 2008 and based in San Francisco, California, Airbnb is a trusted community marketplace for people to list, discover, and book unique accommodations around the world — online or from a mobile phone. Whether an apartment for a night, a castle for a week, or a villa for a month, Airbnb connects people to unique travel experiences, at any price point, in more than 33,000 cities and 192 countries. And with world-class customer service and a growing community of users, Airbnb is the easiest way for people to monetize their extra space and showcase it to an audience of millions. No global movement springs from individuals. It takes an entire team united behind something big. Together, we work hard, we laugh a lot, we brainstorm nonstop, we use hundreds of Post-Its a week, and we give the best high-fives in town. Headquartered in San Francisco, we have satellite offices in Dublin, London, Barcelona, Paris, Milan, Copenhagen, Berlin, Moscow, São Paolo, Sydney, and Singapore.
    travel
    marketplace
  • Mixpanel
    Mixpanel
    Y Combinator LogoS2009
    Active • 410 employees • San Francisco, CA, USA
    Mixpanel is analytics for builders that need answers from their data at their fingertips. When everyone in the organization can see — and learn from — the impact of their work, they are poised to make better decisions. Companies like OpenAI, Netflix, Pinterest, sweetgreen, CNN, samsara, Uber, and Yelp use Mixpanel to understand their customers, measure progress, and endeavor to make better decisions.
    analytics
    databases
    cloud-computing
    data-visualization
    b2b
  • Stripe
    Stripe
    Y Combinator LogoS2009
    Active • 7,000 employees • San Francisco, CA, USA
    Launched out of Y Combinator’s 2009 Summer batch, Stripe is a global technology company that builds economic infrastructure for the internet. Businesses of every size—from new startups to public companies—use our software to accept payments and manage their businesses online Stripe is a proud partner of YC companies—from Airbnb (S09) to Defog (W23)—to help them grow their businesses and increase the GDP of the internet.
    fintech
    banking-as-a-service
    saas
  • PagerDuty
    PagerDuty
    Y Combinator LogoS2010
    Public • 950 employees • San Francisco, CA, USA
    PagerDuty is an operations performance platform delivering visibility and actionable intelligence across the entire incident lifecycle. Their SaaS-based solution empowers over 10,000 small, mid-size and enterprise global customers such as Comcast, eHarmony, Slack and Lululemon with the insight to intelligently respond to critical disruptions for exceptional customer experience. PagerDuty was founded to deliver a new and innovative approach to increase business response and efficiency. When brand reputation depends on customer satisfaction, PagerDuty arms businesses with the insight to proactively manage incidents and events that may impact customers across their IT environment.
    monitoring
    devops
  • Amplitude
    Amplitude
    Y Combinator LogoW2012
    Public • 750 employees • San Francisco, CA, USA
    Since graduating from YC, Amplitude (W12) has made it to IPO and beyond by helping cutting edge startups become category leaders. We’ve pioneered the digital analytics category to become the go-to solution for AI pioneers (Cruise, Midjourney), apps that touch millions of consumers (Doordash, Coinbase), and the best in B2B (Atlassian, Rippling, Canva). With product analytics, experiment, CDP, session replay, and more, Amplitude’s digital analytics platform shows you what your users love, where they’re getting stuck, and what keeps them coming back. You want to build a generational business, and we have the capabilities and pricing plans to guide you every step of the way. Check out our special deal for YC companies and get started on your analytics journey.
    b2b
    analytics
    data-visualization
    developer-tools
    marketing
  • Matterport
    Matterport
    Y Combinator LogoW2012
    Public • 201 employees • Sunnyvale, CA, USA
    Matterport is an immersive media technology company that is shaking up the 3D / VR world. Our team has built the first end-to-end system for creating, modifying, distributing, and navigating immersive 3D and virtual reality (VR) versions of real-world spaces on web and mobile devices. Matterport offers the world's most inexpensive and simplest way to capture 3D spaces. Our products include: - Matterport Pro Camera for capturing real spaces in 3D. It collects accurate visual and spatial data to map entire areas in minutes and is all about automation and ease of use. - The Matterport Cloud for processing and hosting 3D models - Matterport Portal, our system for viewing, editing, and managing models; collaborating with colleagues; and sharing models with others - Matterport 3D Showcase, a browser-based 3D media player, which allows anyone to view 3D models in their browser with no additional software - Matterport Core VR: All Spaces can be converted to VR and experienced on Samsung Gear VR or Google Cardboard (in beta), with additional device support coming soon. Matterport 3D media solutions power industries from real estate (residential, multi-family and commercial) and travel and hospitality (hotels, vacation rentals, and venue booking), to business listings, architecture, engineering and construction, news and entertainment, and everything in between. We’re growing fast. If you’re passionate about solving cutting-edge problems in computer vision and hardware design and creating order-of-magnitude improvements in the ability to easily create and share 3D models of real world spaces, we want to talk to you. See open positions at matterport.com/jobs. Try Matterport for yourself at matterport.com/try.
    computer-vision
  • Gusto
    Gusto
    Y Combinator LogoW2012
    Active • 2,400 employees • San Francisco, CA, USA
    Launched in 2012 as ZenPayroll, Gusto serves more than 300,000 businesses nationwide. Each year we process tens of billions of dollars of payroll and provide employee benefits—like health insurance and 401(k) accounts—while helping companies create incredible work places. Through one refreshingly easy, integrated platform, we automate and simplify your payroll, benefits, and HR, all while providing expert support. You and your employees will get the peace of mind you need to do your best work.
    b2b
    payroll
    health-insurance
  • Reddit
    Reddit
    Y Combinator LogoS2005
    Acquired • 2,000 employees • San Francisco, CA, USA
    Founded by Steve Huffman and Alexis Ohanian in 2005, Reddit is an online community where users submit, vote, and comment on content, news, and discussions. Nicknamed "the front page of the internet,"​ Reddit is one of the top ten sites in the United States (source: Alexa), with hundreds of millions of users each month on desktop, mobile web, and our official Android/iOS apps. Interested in joining our growing team? Check out about.reddit.com/careers
    community
    social
    social-media
    social-network
  • Optimizely
    Optimizely
    Y Combinator LogoW2010
    Acquired • 1,500 employees • San Francisco, CA, USA
    At Optimizely, we're on a mission to help people unlock their digital potential. We do that by reinventing how marketing and product teams work to create and optimize digital experiences across all channels. With Optimizely One, our industry-first operating system for marketers, we offer teams flexibility and choice to build their stack their way with our fully SaaS, fully decoupled, and highly composable solution. We help companies around the world orchestrate their entire content lifecycle, monetize every digital experience and experiment across all customer touchpoints – all through Optimizely One, the leading digital experience platform that powers every phase of the marketing lifecycle through a single, AI-accelerated workflow. Optimizely has nearly 1500 employees across our 21 global offices and has 700+ partners. We are proud to help more than 10,000 businesses, including H&M, PayPal, Zoom, and Toyota, enrich their customer lifetime value, increase revenue and grow their brands. At Optimizely, we live each day with a simple philosophy: large enough to serve, small enough to care. Learn more at optimizely.com.
    marketing
  • Pocket
    Pocket
    Y Combinator LogoW2026
    Active • 6 employees • San Francisco, CA, USA
    Pocket is a tiny AI device that lives on your phone and turns everything you say and hear into clear notes, action items, and search. We combine custom hardware, AI, and software to build the best note-taking experience for people who talk and move fast
    note-taking
    hardware
    productivity
    artificial-intelligence
  • Didit
    Didit
    Y Combinator LogoW2026
    Active • 12 employees • San Francisco, CA, USA
    Didit is an AI-native, developer-first identity verification platform that makes KYC, AML, and fraud prevention instant, flexible, and transparent, with a seamless user experience and more than 70% lower costs.
    saas
    identity
    ai
  • Fifth Door
    Fifth Door
    Y Combinator LogoF2025
    Active • San Francisco, CA, USA
    Fifth Door unlocks the power of imagination by making it easy for everyone to create, share, and play games anywhere, with anyone. We exist to stimulate the creativity, connection, and joy that people get when they play games.
    gaming
    consumer
    ai
  • AVoice
    AVoice
    Y Combinator LogoW2026
    Active • 4 employees • San Francisco, CA, USA
    AVoice brings full visibility to the physical side of sales. Most sales intelligence tools only track digital interactions — emails, calls, CRM entries — but the majority of global revenue is still driven by in-person visits. Reps take photos, record voice notes, send quick messages, and make on-site observations, but this information is scattered, unstructured, and rarely reaches the CRM. AVoice automatically captures, analyzes, and structures everything that happens during a field visit. Photos, voice notes, text updates, and observations are instantly transformed into searchable insights for reps, managers, and leadership. AVoice highlights risks, opportunities, buying signals, product issues, market trends, and territory health in real time. By turning the offline economy into usable data, AVoice gives companies the visibility they’ve always had for digital sales — now applied to the real world where deals are actually won.
    saas
    artificial-intelligence
    sales-enablement
    sales
  • Luel
    Luel
    Y Combinator LogoW2026
    Active • 2 employees • San Francisco, CA, USA
    Luel is the go-to market for fast, rights-cleared multimodal training data at scale. We work with AI teams to provide bespoke data collections sourced from our global network of vetted contributors and off-the-shelf datasets. With our efficient contributor pipeline and multi-stage QA pipeline, we cut out slow vendor processes and deliver on-spec data with full provenance.
    marketplace
    b2b
    big-data
  • Valgo
    Valgo
    Y Combinator LogoW2026
    Active • 2 employees • San Mateo, CA, USA
    As autonomy moves into complex safety-critical domains (e.g., aviation), failures become more costly and companies must devote significant in-house effort to validate their system before real-world deployment. Valgo accelerates autonomous systems development and certification by providing tooling to perform algorithmic safety validation at scale. We are building a platform to efficiently find rare and realistic failure events in simulation at a fraction of the compute cost required by existing approaches. Our tools are agnostic to models/simulators (i.e., black box) and can be applied across industries such as autonomous vehicles, aviation, robotics, space, defense, energy, and finance. Valgo was founded by Stanford PhDs who wrote the textbook and taught the course at Stanford on algorithmic safety validation. We also have significant industry experience working on an FAA-certified collision avoidance system at MIT Lincoln Laboratory, validating autonomous aircraft at Xwing, and collaborating with industry sponsors across transportation, aviation, and energy.
    b2b
    aerospace
    trust-&-safety
    self-driving-vehicles
    robotics
  • Sarah AI
    Sarah AI
    Y Combinator LogoW2026
    Active • 2 employees • San Francisco, CA, USA
    Sarah AI is building the AI-native operating system for consumer goods brands—an autonomous supply-chain brain that replaces legacy ERPs and actually runs the business. Founded by Chris (2x Founder; ex-CEO at Better Nature; Forbes 30U30) and Dirk (ex-Google Data, Analytics & AI Lead), we’re backed by YC (W26). In our first month full-time, we’ve raised $1.6M and secured rapid commercial traction with 15 design partners and a growing pipeline of 30+ brands. Our mission is bold: give CPG brands completely hands-free supply chains that run themselves through Sarah, their AI ops assistant. We’re now growing a small, world-class team of builders excited to reinvent how physical goods companies operate—end-to-end, autonomous, and AI-first. If you want to work on hard problems, ship fast, and define the future of autonomous operations, you’ll feel right at home here.
    aiops
    saas
    b2b
  • Null Labs
    Null Labs
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    We provide defense companies with simulation infrastructure train and validate autonomous systems.
    robotics
    aerospace
  • Tensr
    Tensr
    Y Combinator LogoF2025
    Active • 3 employees • San Francisco, CA, USA
    Tensr is building fully autonomous robotic factories that make scaling hardware as effortless as scaling on AWS. We’re a group of Berkeley graduate robotics researchers who previously won a full scale autonomous IndyCar competition at 160mph.
    industrial
    hardware
    robotics
    automation
    deep-learning
  • AtlasGrid
    AtlasGrid
    Y Combinator LogoF2025
    Active • 6 employees • Mountain View, CA, USA
    AtlasGrid automatically builds a visual graph of your mobile app UI and displays analytics directly on your screens. Additionally, our fleet of AI-powered agents will continuously analyze thousands of mobile apps, gathering design insights and identifying growth opportunities + actionable product improvements.
    design-tools
    analytics
    ai
  • Mayflower
    Mayflower
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    Mayflower is building an AI-powered HR plug-in that automates immigration screening, eligibility checks, and compliance for global candidates. The platform parses documents, classifies visa pathways, and generates attorney-ready forms. By integrating directly with existing HR systems, Mayflower helps companies surface only compliant candidates, reduce legal risk, and streamline the international hiring process.
    govtech
    legaltech
    immigration
  • Velum Labs
    Velum Labs
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    Velum is an open-source firewall for content-level access control across documents, databases, and applications. Admins define policies, and we apply them in real time across your entire stack to control what each recipient sees. Our firewall sits between your data sources and consumers (LLMs, users, vendors), enforcing policies on every request. We understand meaning in text, documents, and databases to detect sensitive information based on your policies, then apply recipient-specific controls without blocking workflows. Create policies in natural language. Teams write rules that define what's sensitive and who should access it, and Velum enforces them consistently across all systems. When authorization changes, we can reveal tokenized data just-in-time for approved recipients, maintaining both security and utility. We integrate directly into your existing infrastructure. For AI workflows, we intercept prompts, responses, and retrievals to prevent sensitive information from leaking into or out of models. For enterprise systems like Salesforce, SAP, or Workday, we extend policy enforcement to exports, reports, and syncs. Velum is designed for scale and compliance. We provide encryption and structure-preserving tokenization for high-throughput pipelines, with multi-cloud deployment options and configurable data residency per tenant to meet your compliance requirements.
    open-source
    privacy
    security
    machine-learning
  • LogosGuard
    LogosGuard
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    Enterprises are racing to adopt AI, but often don't have the right controls in place or know how to verify vendors are compliant. LogosGuard turns AI policies into executable controls, stress-tests your AI products, and continuously monitors changes, giving enterprises the confidence to scale AI responsibly.
    cybersecurity
    compliance
    security
    b2b
    ai
  • Scoop
    Scoop
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    We’re building AI agents that speed up drug trials by automating the manual consolidation and document prep required for every IND submission. Today, biotechs spend months stitching together reports from contractors and internal teams just to file and get to their first-in-human trial.
    biotech
    biotechnology
    compliance
    b2b
    artificial-intelligence
  • Exonic
    Exonic
    Y Combinator LogoF2025
    Active • 3 employees • San Francisco, CA, USA
    Exonic is building a global network of intelligence to cure disease. We are the first drug discovery company open to everyone. Today drug discovery is siloed - secretive, adversarial institutions in glass towers. Biological AI is changing the rules. Every day drug discovery becomes more of a computational problem. Exonic is turning drug discovery into an open, meritocratic tournament. We are advised by world leaders in bio AI, including the former Head of AI at Ginkgo Bioworks, and the first author of Evo (cover of Science). All of the best biological AI models are open source. And on Exonic, you can combine them, prompt them, and share your innovative workflows without writing a single line of code. Using Exonic Studio, we just beat a state-of-the-art benchmark in liver cancer (HepG2) synthetic enhancer design, validated in our wet lab. The platform just went live - you can start right now. We are turning the internet into a drug discovery powerhouse.
    crowdsourcing
    drug-discovery
    synthetic-biology
    biotechnology
    artificial-intelligence
  • Forge Robotics
    Forge Robotics
    Y Combinator LogoF2025
    Active • 3 employees • San Francisco, CA, USA
    Forge Robotics is changing the way that metal parts are fabricated. We are enabling a future where our intelligent robotic system completes all steps needed to take raw metal stock and transform it into fully welded parts. Beginning with welding, we are building a robot-mounted vision system and AI feature detection that creates a real-time 3D map and tells the arm exactly where to go at every instant.
    robotic-process-automation
    robotics
    industrial
  • Captain
    Captain
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    Captain delivers the most accurate general-purpose retrieval engine for unstructured data. Connect file stores and effortlessly retrieve knowledge with much higher accuracy than RAG (Avg: 78% → 95% + citations).
    developer-tools
    data-engineering
    big-data
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