SaaS Startups funded by Y Combinator (YC) 2026

May 2026

Browse 968 of the top SaaS startups funded by Y Combinator.

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

  • Flock Safety
    Flock Safety
    Y Combinator LogoS2017
    Active • 1,000 employees • Atlanta, GA, USA
    Flock Safety provides the first public safety operating system that empowers private communities and law enforcement to work together to eliminate crime. We are committed to protecting human privacy and mitigating bias in policing with the development of best-in-class technology rooted in ethical design, which unites civilians and public servants in pursuit of a safer, more equitable society. Our Safety-as-a-Service approach includes affordable devices powered by LTE and solar that can be installed anywhere. Our technology detects and captures objective details, decodes evidence in real-time and delivers investigative leads into the hands of those who matter. While safety is a serious business, we are a supportive team that is optimizing the remote experience to create strong and fun relationships even when we are physically apart. Our flock of hard-working employees thrive in a positive and inclusive environment, where a bias towards action is rewarded. Flock Safety is headquartered in Atlanta and operates nationwide. We have raised $150M in our Series E led by Tiger Global at a $3.5B valuation.
    hardware
    saas
    machine-learning
  • 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
  • Podium
    Podium
    Y Combinator LogoW2016
    Active • 1,000 employees • Lehi, UT, USA
    Podium is the all-in-one AI-powered lead management and communication platform used by more than 100,000 businesses to acquire and convert new customers. At the forefront of Podium’s innovation is its AI employee, who ensures businesses respond to leads instantly, anytime of the day or night—significantly increasing lead conversion rates and revenue. Podium helps businesses obtain more reviews, rank higher on Google, and consolidate lead channels. Businesses can call and text customers from the web and/or mobile app, send payment links, drive repeat business through bulk messages, and more—all managed and delivered from one easy-to-use dashboard. Additionally, with Podium’s AI Employee and automations, businesses can efficiently handle customer inquiries seamlessly across all communication channels, providing timely and accurate responses that drive sales. Podium’s innovative work has gained recognition on top industry lists, such as Forbes’ Next Billion Dollar Startups, Forbes’ Cloud 100, the Inc. 5000, and Fast Company’s World’s Most Innovative Companies. Podium was founded in 2014 and is headquartered in Lehi, Utah. It is currently backed by Accel, Summit Partners, GV (formerly Google Ventures), and Y Combinator.
    ai
    saas
    b2b
    fintech
  • 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
  • Weave
    Weave
    Y Combinator LogoW2014
    Public • 600 employees • Lehi, UT, USA
    As the pace of innovation continues, it is growing more difficult to see the value of technology. Often meaningful information is inaccessible at the time it would be most beneficial. Weave threads together data, software and communication platforms to build stronger relationships at the point of contact by making valuable information instantly available in simple and intuitive formats. This delivers improved productivity, better collaboration and greater insights making it easier to meet the needs of patients and to build better business and clinical outcomes.
    saas
  • 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
  • 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
  • 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
  • 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
  • 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
  • CharacterQuilt
    CharacterQuilt
    Y Combinator LogoP2026
    Active • 4 employees • San Francisco, CA, USA
    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. 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.
    artificial-intelligence
    b2b
    ai
    saas
    marketing
  • Synphony
    Synphony
    Y Combinator LogoP2026
    Active • 10 employees • San Carlos, CA, USA
    Strawberry farming is a $3B industry in California alone with 60% labor cost using 40-year old software. Synphony provides strawberry picking robots and software services including: bed-level analytics, data pipeline integration, and agentic solutions. Synphony's "side hustle" is selling data, evals, and viral demos to robot foundation labs while building capacity for general robot deployments. We've started with strawberry farming for great margins and outdoor data moat, but also received requests for robots in semi-conductors and autonomous space labs. Synphony's team has won over 15 hackathons together (taking home 4 Jensen-signed GPUs!). Sean did ML research at NVIDIA and led AI products used by IRS and Citibank. Lucas' research spanned robotics, IoT devices, and neuromorphic computing. Alex architected an app with 400k users.
    robotics
    food-service-robots-&-machines
    agriculture
    saas
  • Klarify
    Klarify
    Y Combinator LogoP2026
    Active • 4 employees • San Francisco, CA, USA
    Klarify handles everything therapists do outside the session, from clinical notes and treatment plans to insurance claims and finding new clients. Therapists hold the world together. They also run businesses, file insurance claims, write letters, fill forms, supervise new grads, and do hours of paperwork every night. Practice management software has existed for decades. It records what therapists do. It can't actually do any of it. Klara is the AI at the heart of Klarify. She reads the session and does the work that comes after it: notes, treatment plans, clinical letters, insurance claims, client homework, supervision prep, and the profile pages that bring in new clients. 5,600 therapists use Klarify today. Our mission is to empower therapists, not replace them. So they can focus on the one thing only a human can do. Be present with their client.
    mental-health-tech
    health-tech
    artificial-intelligence
    saas
    b2b
  • Chronicle Labs
    Chronicle Labs
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    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.
    ai
    aiops
    saas
  • Rudus
    Rudus
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    Rudus is an AI-powered takeoff and estimation platform built for concrete contractors. We cut takeoff time by 70% and help estimators bid 2-5× more projects without adding headcount. From plan upload to bid package, every part of the workflow gets faster.
    b2b
    artificial-intelligence
    saas
    construction
  • ReasonBlocks
    ReasonBlocks
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    ReasonBlocks makes AI agents more accurate and cheaper by catching failures mid-run and compounding reasoning patterns across every agent you deploy. Plugs into your existing agent stack in minutes and starts improving results from the first call.
    saas
    b2b
    artificial-intelligence
  • Memory Store
    Memory Store
    Y Combinator LogoP2026
    Active • 4 employees • San Francisco, CA, USA
    One memory for your team's agents. Turn every meeting, Claude session, and Slack chat into context your team and agents share.
    generative-ai
    saas
    consumer-products
  • Chert
    Chert
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    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.
    customer-support
    api
    conversational-ai
    saas
    artificial-intelligence
  • Pairio
    Pairio
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco
    Pairo is an AI mobile app to help technicians fix broken equipment in factories. Users just take a picture of the broken machine and we search thousands of pages of manuals to find the right solution.
    saas
    b2b
    manufacturing
  • Elyra
    Elyra
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    Elyra is an AI reservation system for restaurants. Instead of missing 40% of incoming phone calls and taking days to reply to emails, leaving over $100,000 in bookings on the table every year, restaurants get AI agents that answer every call and email instantly, 24/7, connected to a reservation system that optimizes table placements in real time so empty seats get filled with the right guests. Felix and Alan met in primary school in Stockholm and have been building things together ever since. We launched with a single restaurant and within weeks they hit record occupancy, bookings they used to miss were suddenly being captured automatically, and empty Tuesday nights started filling up. Today we power top restaurants groups. There are over 1 million restaurants in the US and Europe alone. The average restaurant loses $100K+ a year to missed calls and slow email replies. At our current pricing, that's a $10B+ market opportunity, and we're the only system that handles the call, the email, and the table allocation in one place.
    saas
    restaurant-tech
    artificial-intelligence
  • Cohesion
    Cohesion
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco
    Cohesion is building AI agents for hedge funds. Our agents track earnings and non-traditional datasets like podcasts and X/twitter. Analysts spend hours a week manually tracking these data sources and still miss relevant investing signals. Now, our agents do it for them autonomously.
    saas
    fintech
    investing
  • Modern
    Modern
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    Modern helps IT, HR, and Finance teams automatically resolve 80%+ of high-volume requests. Teams define workflows in plain language, set approval rules and policies, and Modern handles the rest: password resets, access provisioning, expense approvals, on-boarding checklists, and more. Everything runs with full audit trails, role-based approvals, and enterprise-grade security built in. Modern works alongside your existing ITSM with no rip-and-replace required or runs as your ITSM from day one. Most teams are live in under a day. For teams that want to go fully hands-off, 100% automation via a fully managed IT services are also available.
    artificial-intelligence
    saas
    aiops
    b2b
    healthcare-it
  • Framewise Health
    Framewise Health
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    We turn medical records into personalized videos walking patients through onboarding, adherence, and recovery. The engagement data we collect builds our AI-native patient engagement platform for pharma, hospitals, medical devices, and private clinics, so they can stop chasing the patient and spend more time caring for them.
    health-tech
    b2b
    saas
  • Sidekick
    Sidekick
    Y Combinator LogoP2026
    Active • 1 employees • San Francisco
    Sidekick is an AI-powered SMS assistant for frontline workers in manufacturing, auto dealerships, and retail. The idea came from Justin's father, who owns a manufacturing facility and asked him to build a tool to help with worker onboarding, training, and organizing company knowledge. Workers text questions in any language and get instant answers from their company's documents — no app, no login, works on any phone. They can send photos of equipment for instant identification or voice memos when their hands are dirty or they're wearing gloves. Managers upload documents and record video walkthroughs; Sidekick automatically generates step-by-step tutorials and a searchable knowledge base. When Sidekick can't answer, it escalates to the manager via SMS and learns from the response, getting smarter with every interaction.
    ai-assistant
    b2b
    saas
  • Kuli
    Kuli
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco, CA, USA
    Kuli is an AI agent for social media and influencer marketing teams at the world's largest consumer brands. Our agent watches every video on socials in the brand's context and helps marketers get work done to launch their campaigns 4x faster. Previous platforms gave marketers databases to search through and a CRM. Kuli actually watches the content. Marketers at team like Supercell, Disney and Havas use it to scout creators, run analysis on trends and competitor strategies, and analyse what makes their campaign perform better. For 10 years, influencer marketing meant more tools, more tabs, more spreadsheets. Kuli replaces all of that with one single agent you orchestrate. One marketer with Kuli does what a $50K/month agency bills for manual tasks.
    ai
    saas
    social-media
    b2b
  • Salesgraph
    Salesgraph
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    Salesgraph equips reps with the most relevant context throughout the deal stage, providing proactive pre-call notes and post-call next steps. Sellers are CEOs of their deals; they need to know who the buyer is, what triggered them to take the first call, what their pain points are, how much value this new tool is bringing, are there any technical blockers, etc. A sale is only good when it doesn't feel like a sale to your customer, but rather the sales rep solved a problem for the customer. This was the problem Ricardo and I solved at Mintlify. We created a business case generator that took in call recordings, background news triggers and job updates, Mintlify's ROI and Pricing calculator, past deals won, and customer case studies --> produced a 3 page document expressing the value Mintlify provided + why the quote presented is justifiable. In doing so we closed more enterprise deals at a higher ACV as our champion was able to build a better purchasing case internally. Our goal is to empower every sales team to close deals at a higher ACV, while making sure reps learn from their mistakes and create a smooth sales experience for their end customer.
    saas
    b2b
    sales
  • Gigacatalyst
    Gigacatalyst
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco, CA, USA
    We provide a AI customization layer that learns your APIs and embeds in your product, so your customers can build their own apps on your SaaS. Each customer can now adapt your product to match their workflows perfectly, and share it across their team with our in-built app store. The result is that customers use your SaaS more, retain for longer, and expand quicker, because they get bespoke implementation for their exact usecase, without waiting. We're live with the top Series B companies with 90% repeat usage rate. Our customers tell us that Gigacatalyst is the best way to increase usage, retention, and expansion in 2026.
    artificial-intelligence
    saas
    enterprise
    no-code
  • Userlens
    Userlens
    Y Combinator LogoP2026
    Active • 4 employees • Helsinki, Finland
    Most B2B churn is preventable - most teams just see it too late. By the time a CSM notices, the champion has already quietly disengaged, key features went unadopted, and the renewal conversation is damage control. The dangerous part? The customer might still be logging in, but they've stopped using what actually matters. Userlens catches all of that months earlier. Our AI agents monitor every user at every account the way your best CSM watches your top five strategic accounts: - feature adoption - usage trends - champion engagement - sentiment shifts in Slack and Intercom - open support issues. When a signal hits (churn risk, renewal, expansion opportunity), Userlens doesn't just alert you. It builds the talking points and deck on top of your team's approved templates and playbook. If you have CSMs, Userlens makes every one of them your best. If you don't have one yet, Userlens runs your book like the best CSM money could buy.
    saas
    enterprise-software
    ai-assistant
    customer-success
  • Sherpa
    Sherpa
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    Sherpa automatically increases website conversion rates by analyzing visitor behavior, building new page variants, and continuously A/B testing them. Customers typically see a 15-20% lift on their primary conversion metric in their first 30 days.
    b2b
    saas
    artificial-intelligence
    marketing
    ai
  • Alchemy
    Alchemy
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco, CA, USA
    Alchemy helps biotech and pharma researchers train and share computer vision models to convert raw images into numerical data, reducing analysis time by 98%. All a researcher has to do is upload their images, describe what they need in plain language, and our agents help assemble their tailored analysis pipeline, select the right models for their specific images, and let them verify every step before exporting reproducible, publication-ready results.
    biotech
    machine-learning
    saas
    automation
    ai-powered-drug-discovery
  • Stage
    Stage
    Y Combinator LogoP2026
    Active • 2 employees • San Francisco
    Teams are shipping faster than ever with AI, but engineers are merging changes that neither they nor their reviewers fully understand, leading to bugs in production and cognitive debt. Stage is a new code review platform built for today’s fast moving teams. Instead of forcing readers to piece things together from unorganized diffs, Stage breaks changes down into structured chapters so teams can understand what's happening and ship with confidence.
    saas
    developer-tools
  • Saffron
    Saffron
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco, CA, USA
    Saffron allows companies to quickly evaluate how well software engineers use AI to code. The way engineers write code has fundamentally changed, but the way companies evaluate them hasn't. Saffron gives teams full visibility into how candidates use AI agents to build, debug, and ship real features on an actual codebase. Saffron was founded by Robert Chondro (formerly MIT and Jane Street), Jerry Yao (Stanford and Jane Street), and Kazuma Choji (Harvey Mudd, published in NeurIPS and ICML), and is backed by Y Combinator (P26) and Afore Capital.
    saas
    human-resources
    hr-tech
  • Harbor
    Harbor
    Y Combinator LogoP2026
    Active • 2 employees • San Diego, CA, USA
    Harbor is a new, AI-enabled system of record for clinical trial data that replaces legacy electronic data capture (EDC) systems. Today, medical device and pharma companies spend months setting up custom EDCs that research sites then spend hours per subject per day entering data into. With Harbor, the EDC is spun up simply by reading your clinical trial protocol and research sites upload raw source documents into the platform, skipping the tedious and error-prone data entry process altogether. EDCs haven’t fundamentally changed since the 1990s. They are passive, regulatory compliant data bins that cause massive trial delays, coordinator burnout, and weeks of back-and-forth to resolve data errors. Because of this, data management currently consumes ~30% of total clinical trial budgets. With LLM and document extraction capabilities finally reaching the accuracy, reliability, and traceability required in high-risk domains, Harbor is redefining the way data is collected and monitored in clinical trials, all while remaining fully GCP- and 21 CFR Part 11 compliant. After months of building our initial product, our platform is now live with its first few clinical studies. For our largest customer and their 1600 subject randomized trial, we were able to use our internal tools to get their study database configured in just one week, which was ten times faster than legacy EDC vendors quoted. We built Harbor because we lived through this problem. Albert spent four years in clinical trials and regulatory strategy for a medical device startup, spending weeks at clinical sites watching coordinators battle legacy software firsthand. Nate brings the technical firepower, having built scalable software at Google and Ramp and as employee #1 at a previous YC startup.
    saas
    health-tech
    b2b
    healthcare
  • Korso
    Korso
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco, CA, USA
    Korso builds AI agents that handle the operational work manufacturers still do manually, including processing RFQs, following up on quotes, coordinating with suppliers, and keeping production on track when things go wrong. Our agents plug into your existing ERP and CRM, understand your workflows, and act on your behalf: triaging incoming requests, chasing delayed orders, notifying customers, and escalating when human judgment is needed. We built Korso around the reality that enterprise systems cannot afford mistakes. Every agent action passes through verification layers, tools are scoped, and critical operations go through dry-run validation and secondary review. Full audit trails mean you can see exactly what was done, why, and when. Most AI automation breaks down at the ERP integration layer. Korso's orchestration is built for the messiness of real manufacturing systems, with long-running workflows that span weeks and checkpointing that never loses progress. Instead of replacing your systems, Korso makes them work harder, so your team spends less time on coordination and more time on the work that actually matters.
    manufacturing
    saas
    artificial-intelligence
  • Arga Labs
    Arga Labs
    Y Combinator LogoP2026
    Active • 3 employees • San Francisco, CA, USA
    We build environments to test your app and agents against the real world. Deploy your code/agent into a sandbox that runs against replicas of external services (Stripe, Slack, Google Drive, etc.). Twins support the same APIs, MCP tool calls & SDKs as the real software, and you can spin up thousands of instances in parallel and seed them using natural language. Run real workflows, surface edge cases, and observe how your code/agents actually behave before hitting production.
    infrastructure
    developer-tools
    saas
  • 10x Science
    10x Science
    Y Combinator LogoW2026
    Active • 3 employees • San Francisco, CA, USA
    10x Science develops frontier AI models with deep memory to redefine how scientists understand and engineer biology across the life sciences, starting with drug development. AI-powered drug discovery is flooding the pipeline with new candidates faster than ever. But before any of them can advance to the clinic, scientists must deeply characterize the protein therapeutic to understand whether it will work. Today, that process takes months of manual, error-prone analysis that cannot keep pace with discovery. Our AI-native platform automates it, giving drug developers the confidence to advance the right candidates and stop the wrong ones early. We have strong commercial traction with enterprise pharma customers. Our founding team built the field of next-generation protein characterization out of Carolyn Bertozzi's Nobel laureate lab at Stanford. Collectively, we have 18+ years of collective domain expertise, 47+ scientific publications, and a 2x YC Founder. We move at the highest velocity and are positioned to lead the next generation of modern AI development in the life sciences.
    b2b
    biotech
    saas
    ai
  • LegalOS
    LegalOS
    Y Combinator LogoW2026
    Active • 3 employees • San Francisco
    LegalOS is an AI-native immigration law firm that combines cutting-edge technology with 40+ years of legal expertise. We’ve studied 12,000 successful petitions to design our process - which allows us to deliver top-quality visa applications in as quickly as 48 hours. Our specialized AI agents draft petition narratives, compile evidence, and anticipate USCIS objections - work that traditionally takes attorneys weeks, if not months. Every case is reviewed and signed by licensed immigration attorneys with 40+ years of experience, so companies get both speed and reliability. We support O-1, H-1B, L-1A, L-1B, TN, EB-1A, EB-1C, and EB-2 NIW petitions. Our unique approach works. We’ve filed dozens of visa applications and have a 100% approval rate so far. The U.S. processes 1M+ work visas annually—a market where incumbents still operate on fax machines, email, and 1990s case management software. We're building the modern immigration law firm.
    artificial-intelligence
    legal
    saas
    b2b
    immigration
  • Moss
    Moss
    Y Combinator LogoF2025
    Active • 5 employees • San Francisco
    Moss is building the real-time semantic search runtime for conversational and multimodal AI. Our system enables voice agents, copilots, and chat interfaces to retrieve, reason, and respond in sub-10 ms, delivering the responsiveness that makes AI interactions feel truly natural. If you’ve ever built a conversational or voice AI product, you’ve felt the lag. That moment when an agent pauses and the illusion of intelligence breaks. The bottleneck is almost always retrieval. Each query hops across networks and databases, adding delay and cost. Moss eliminates that gap by keeping retrieval close to where the agent runs. Moss runs natively across browsers, mobile devices, and servers with an optimized vector index built in Rust and WebAssembly. It enables teams to build AI products that feel instant, contextual, and adaptive. The experiences that sustain engagement and unlock new kinds of interaction. For our customers, this translates into tangible business value: stronger user retention, higher conversion, and entirely new product categories made possible by real-time understanding. Moss is already powering production pilots across voice AI and developer platforms, achieving sub-10 ms retrieval and 70–90% token savings compared to traditional pipelines.
    ai
    developer-tools
    saas
  • Allus AI
    Allus AI
    Y Combinator LogoF2025
    Active • 3 employees • Atlanta, GA, USA
    Allus builds next-gen vision foundation models that bring real intelligence to manufacturing. Enabling factories to see, understand, and improve production in real time.
    computer-vision
    machine-learning
    manufacturing
    saas
    artificial-intelligence
  • Expected Parrot
    Expected Parrot
    Y Combinator LogoF2025
    Active • 5 employees • Cambridge, MA, USA
    Expected Parrot helps companies simulate their customers with AI agents to explore pricing, product, marketing, communications and other scenarios at scale. Our open-source library and no-code web app let you design custom agent personas and conduct interviews and surveys with them using LLMs of your choice to generate results and reports. Everything is cached and reproducible, and you can send the same surveys to human respondents to validate results in the same interface.
    generative-ai
    saas
    open-source
  • Hyperspell
    Hyperspell
    Y Combinator LogoF2025
    Active • 6 employees • San Francisco, CA, USA
    Hyperspell is the Memory & Context Layer for AI Agents. AI agents are clueless geniuses. They crush humans on any standardized test, but wouldn't last a day at a real job. What today's super-intelligent agents are missing is the real world context they are operating in. A context that humans stitch together from hundreds of data points across dozens of interactions and channels. A context that grows with their tasks. Hyperspell gives AI agents this context by connecting to their user’s workspace data and building a personalized memory and context layer.
    artificial-intelligence
    machine-learning
    saas
    data-engineering
  • Aside
    Aside
    Y Combinator LogoF2025
    Active • 3 employees • San Francisco, CA, USA
    Aside is an AI browser that acts on your behalf. Give it your passwords, browsing history, and browser context. It gets real work done end to end in the apps you already use, with no integrations required. - 🌐 Browser-native automation: Works directly in Gmail, Notion, Slack, Figma, banking apps, and internal tools, without any integrations. - 🔑 Passwords into tools: Lets AI use logins, sessions, passkeys, and credentials to take action. - 📚 Browsing history into memory: Gives AI persistent context across sessions. - 🧡 Push notifications into a heartbeat: Lets agents react to events and resume work in real time.
    saas
    ai
    automation
  • Cranston AI
    Cranston AI
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    Cranston is a full stack AI accounting firm automating the $900b market for accounting labor. Our software automates reconciliation, tax compliance and financial analysis for startups & SMBs. We pull in context from all your company's apps & data, connect to existing systems of record and handle repetitive accounting work. Our team is deep in the accounting space. Sean spent 5 years building an ERP after dropping out of Stanford and Max spent 5 years building an accounting firm that did every accounting workflow you can imagine on top of ERPs.
    b2b
    saas
    ai
  • ComplyDo
    ComplyDo
    Y Combinator LogoF2025
    Active • 10 employees • Berlin, Germany
    The most flexible enterprise compliance engine that makes GRC teams 10x more efficient. Already trusted by global leaders and the largest EU enterprises. What it does: - Extracts requirements from any file - Maps them to controls and policies - Shows gaps and monitors changes - Advises on maturity and next steps
    cybersecurity
    artificial-intelligence
    saas
    b2b
    legaltech
  • Primer
    Primer
    Y Combinator LogoF2025
    Active • 2 employees • Los Angeles
    Primer is an AI agent that sells, onboards, and supports users automatically through live, personalized walkthroughs.
    saas
    sales
    customer-support
    artificial-intelligence
  • Uplane
    Uplane
    Y Combinator LogoF2025
    Active • 7 employees • San Francisco, CA, USA
    Uplane replaces marketing agencies with AI. We generate hundreds of ads with matching landing pages and steer the ad spend across channels like Meta, Google, LinkedIn and others. By connecting to CRM and ERP data, Uplane learns what drives profits and continuously improves campaigns. Companies waste billions on bad ads, mismatched landing pages, and poor budget allocation. Uplane fixes this by replacing a patchwork of agencies, spreadsheets, and siloed tools with one self-improving system. The result: Higher ROAS for enterprises and effortless, expert-level marketing for SMBs.
    artificial-intelligence
    saas
    b2b
    advertising
    analytics
  • Mod AI
    Mod AI
    Y Combinator LogoF2025
    Active • 4 employees • San Francisco
    We're building the first fully autonomous accounts payable platform. Our AI clerks handle your entire AP workflow: invoice processing, GL coding, PO matching, approvals, responding to vendors, fraud detection and reporting. From the moment an invoice hits your inbox to the moment it's paid, no manual steps required. We integrate with 16+ ERPs including QuickBooks, NetSuite, SAP, Dynamics 365, and Workday. Find out why enterprise teams choose Mod AI at usemod.ai.
    fintech
    saas
    ai
    artificial-intelligence
    finance
  • Lexi
    Lexi
    Y Combinator LogoF2025
    Active • 4 employees • San Francisco, CA, USA
    At Lexi, we are building AI associates for Corporate Law. Our associates learn your firm's standards and improve with every case, having already handled 135,000+ documents across 7,000+ cases.
    b2b
    legal
    legaltech
    saas
    artificial-intelligence
  • Semble AI
    Semble AI
    Y Combinator LogoF2025
    Active • 2 employees • San Francisco, CA, USA
    Semble AI builds AI agents that design building-systems (fire, HVAC, plumbing, security). Construction companies use Semble to cut down weeks on commercial and residential projects. The $600B building-system integration industry still runs on spreadsheets and manual drawings, even as building codes rapidly evolve and become more localized. It’s a massive blind spot for the tech world. Jonathan and Ethan met studying computer science at Stanford. Jonathan worked at Convergint, one of the world's largest building system integrators, specifically for the purpose of learning how this industry works. Ethan is obsessed for a different reason: His house burned down in a wildfire in 2017. They are determined to make Semble the industry standard for construction design.
    artificial-intelligence
    saas
    design-tools
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