SaaS Startups funded by Y Combinator (YC) in San Francisco 2026

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.

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

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/

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.

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. 

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.

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.

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.

Our mission at 10x Science is to enable biopharmaceutical development to keep pace with AI-powered drug discovery. Thanks to AI, the front end of drug discovery is flooding the pipeline with new drug candidates. However, current solutions for drug development are unable to resolve drug complexity and cannot keep up with modern demand. Our platform is the unlock for this bottleneck. By applying modern AI to the development stage, specifically to protein characterization and quality assessment, we provide an end-to-end solution to dramatically speed up and scale up the preparation of candidates for the clinic. Our team is composed of Stanford University researchers from a Nobel Laureate's lab with 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 drug development.

Cardboard is an agentic video editor for growth/marketing teams and serious creators who need to ship videos consistently. Instead of agencies, long timelines, and infinite review cycles, teams give cardboard a footage + a goal (“3 variants”, “30s hook”, “testimonials”) to get a strong first cut in minutes on which they can iterate quickly. Multimodal LLMs can finally reason over footage, and WebGPU/WebCodecs make a real NLE possible in the browser. For the first time, an “AI director” inside a professional editor can be a reality. We have to build two hard things at once: a high-performance editor in the browser and an agentic editor that is reliable for production use cases. Most startups do one; incumbents can’t rebuild their stack without breaking everything. Saksham and Ishan met in school and have known each other since 15 years. Saksham was Co-founder/CTO of Iterate AI (backed by EF) and posts content on social media; Ishan has spent ~5yr building memory-heavy, performance-critical browser apps at HackerRank (S11) and deeply understands browsers. He has built Hotspoter (5M+ downloads) when he was 14. Together, we’re unusually suited to build the editor core others avoid. Video is becoming the default distribution channel, and the team that iterates fastest compounds attention. Cardboard becomes the default workspace for video production, the way Canva/Figma became the workspace for design - because it’s collaborative, fast, and does the tedious parts for you.

Tensol is the AI-native operating system for hospitality. We replace legacy hotel ERPs and back-office software with one system that runs guest communications, bookings, reviews, procurement, and invoicing in a single place, where AI agents answer guest messages, send quotes and confirmations, update bookings, respond to reviews, and log everything directly in the system. We’re starting with guest communications and review management, where AI agents handle inbound guest requests and reviews end-to-end, making front-office teams 3x more productive, resolving 80% of inquiries automatically, increasing upsells and brand reputation.

In emerging markets like the Philippines, open finance is still nascent. Most of the population is traditionally unbanked, banking APIs don’t exist, and a borrower’s financial history lives in documents: e-wallet records, bank statements, utility bills, and more. Because this data is unstructured, credit and risk teams are forced into manual review. This slows decisioning, increases costs, and caps lending volume. Legacy OCR solutions break on noisy, real-world files and still require human verification. Kita is the first document intelligence platform built specifically for lending. We are hyperlocalized around the signals that actually drive lending outcomes in emerging and undertapped domestic markets like the Philippines, Indonesia, Mexico, and beyond. Using a layered system led by vision-language models and computer vision, we outperform traditional OCR by transforming messy borrower documents into fraud-checked, decision-ready signals lenders can use directly in underwriting. Under the hood, Kita is a learning system. We link document-level signals to repayment outcomes, allowing our models to continuously improve fraud detection and risk assessment over time. This creates a compounding advantage for lenders as their distinct underwriting decisions feed back into the system. We secured a six-figure paid pilot with a Philippine lender the week we built our prototype. Since then, we’ve expanded with customers across multiple Southeast Asian markets, shipped new features continuously, and grown roughly 30% MoM. We’re Carmel and Rhea. We met before Stanford and have been building together ever since. Carmel is from Manila, is a repeat founder, and spent three years in product at Apple. Rhea has a research background in computer vision and received the highest honor in Stanford Computer Science. Together, we combine deep local context with strong technical execution to build the infrastructure that expands access to credit in emerging markets.

Multi-agent systems fail quietly today due to state drift, broken assumptions, and coordination breakdowns. Arzule ingests failed traces from tools like CrewAI, LangChain, Claude Code, and custom stacks, finds coordination failures, and generates a corrected trace. Users can approve or deny the correction so Arzule learns what “good” looks like in the context of the current project. It provides observability, debugging tools, failure detection, and patch plans that can be dropped back into agent workflows to improve costs, efficiency, and quality. Additionally, Arzule is currently offering early access to synthetic creation and labeling of multi-agent coordination tasks for companies who reach out.

We turn existing store security cameras into an AI system that catches shoplifting in real time and alerts staff before thieves leave.

Caretta is a Sales Intelligence for revenue teams. It joins reps in live calls, helping them handle information requests, questions, and objections in real time. Caretta lives in Slack to join the team conversation. Caretta gets smarter automatically: every call expands its knowledge base and objection library, turning conversations into compounding organizational advantage.

o11 brings bulge bracket level speed and output quality to capital markets firms of any size. Seamlessly integrated into every Microsoft 365 tool, it transforms your documents and models into a dynamic knowledge layer that drives research, modeling, and client ready deliverables with consistent precision.

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.

Agentic Fabriq is the single control plane for data permissioning throughout your entire organization across your AI and employees. Through Fabriq, any employee can tap into AI/agents with exactly the data and tools they're cleared to use by an admin. Fabriq can be used internally with employees or externally for customers while handling the auth + integrations + permissions securely for you.

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.

Sciloop is building an AI Co-Scientist that automates experimentation and analysis for machine learning researchers, allowing them to test ideas far faster than today’s tools allow. We are Bilal and Osman, International Physics Olympiad medalists and the only Pakistanis admitted to MIT in our respective years, with several years of hands-on ML research experience inside MIT CSAIL. We have built large-scale training pipelines, worked with terabyte-scale datasets, and seen the research bottleneck firsthand while contributing to scientific ML projects. We left MIT to solve this problem directly and are now building a system that can eventually accelerate scientific discovery itself. https://sciloop.dev

Arcten enables companies to embed AI copilots directly into their applications so users can accomplish complex workflows through natural language. You can add AI copilots to your product in minutes, connect them to your company’s information, and track how they’re performing -- all in one place.

Nivara gives engineering leaders visibility into how humans and AI build together, helping teams spot bottlenecks, measure impact, and turn AI adoption into real outcomes. We're building the much needed copilot for Engineering Managers and empower every team to work intelligently with AI.

Aside listens to your sales calls and surfaces real-time answers pulled from your docs, HubSpot, or past calls. It's like pressing 𝚌𝚝𝚛𝚕+𝚟 on your company’s knowledge into every rep – so anyone can sound like your best rep. - 🔎 Shows answers from your docs, Slack, and past winning calls - 📝 Live coaching that catches what reps miss: Aside spots what reps skip during calls and guides every rep to apply your playbook - BANT, SPICED, or your own - not after, live. - 💬 Preload your cheatsheets as Live Cards: Turn your playbooks, FAQs, and notes into instant, in-call cards. - 🎓 Coaching feedback, remembered by AI: Aside reviews every call, gives feedback, and turns it into live suggestions for your next one - so you never repeat the same mistake.

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.

Soren builds autonomous agents to replace human engineers on manual AI evaluation tasks. Evals are essential for building reliable AI systems, yet they remain incredibly time-consuming. Teams spend countless hours maintaining their evals and digging through piles of logs and traces to debug their systems. At scale, this level of manual work simply isn’t sustainable. Soren changes that with powerful agents that work alongside your team. They reason across test cases and logs to pinpoint root causes, then run targeted experiments to surface better-performing solutions. New test cases are added whenever new behaviors are detected, so engineers can stop doing ad-hoc maintenance. Built by MIT engineers who've published leading research in this space and lived the problem. We're building a future where AI handles the work and humans simply provide oversight.

Primer is an AI agent that sells, onboards, and supports users automatically through live, personalized walkthroughs.

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.

AutoAce is building the AI native operating system for car dealerships. We start with AI service advisors that answer calls and book appointments, so no call is missed and no revenue is lost. Our mission is to connect service, sales, parts, finance, and insurance into one platform, transforming dealerships from reactive operations into proactive systems that anticipate customer needs.

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.

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 2017 due to a faulty fire system. They are determined to make Semble the industry standard for construction design.

Bear helps companies capture and convert the highest-intent leads on the internet - visitors clicking from ChatGPT, Perplexity, and other AI agents. Bear owns the entire funnel from agent discovery to conversion.

Imagine AI clones you, not just your voice. We build you online with high-fidelity personas that replicate how you think, write, and sell - so our AI can handle your entire B2B content pipeline: posts, strategic comments, blogs and content engineering to achieve content-market fit. For B2B service firms and YC companies, this means turning founders' expertise into a pipeline-generating machine. Instead of executives spending 8+ hours a week trying to create content, our forward-deployed content engineers perform deep research to understand who you are -> your voice, your clients' pain points, your unique insights -> then ship and optimize content that books meetings at named accounts. Our second-time founding team includes Sky Yang (raised $150M as UCSD's youngest Student Body President) and Neo Lee (a Berkeley Math/AI researcher who dropped out to build this). We launched in November, now serve 40+ paying customers (Series-A,B and seed stage companies plus VCs, global franchises, and ghostwriting agencies). Achieving minimum 30%-70% week to week growth. 💡 Results: $20 M+ total revenue generated across clients $5 M deal closed from a single LinkedIn post $40 K inbound revenue in 1.5 weeks for one client 200+ qualified inbounds in 1 month after hitting content-market fit We’re not just another AI tool. We’re forward-deployed content engineers, building the content OS for every LinkedIn-native B2B company. 📅 Book a demo: https://calendar.notion.so/meet/skyyang333/ghost 🔗 Connect with Sky: https://www.linkedin.com/in/skyyang/

Outsourced IT is a $350B industry running on 10-20% margins. We're building AI employees to help them solve support tickets faster and increase margins to 70-80%. Yolanda worked as a Senior Support Engineer at Netflix. Her team ran 3x more efficiently than average outsourced IT companies. We're now bringing the automation Netflix has to 150K companies globally.

Serafis is a search and discovery engine for long-form content. Our AI knowledge graph turns under-indexed data into structured market intelligence — starting with podcasts. We help investors and operators: • Accelerate research • Surface new insights • Distill signal from noise We are already live with 12 organizations managing over $70B in capital. Our library features >10,000 curated transcripts featuring top investors, Series A+ founders, and public company CEOs — searchable by person, company or theme.

Trace is a workflow automation platform that routes tasks to the right agent – human or AI. We enable enterprise-grade context and AI orchestration in mid-sized teams. Trace breaks workflows into clear steps, sends repetitive tasks to AI agents, and routes the rest to the right people while respecting permissions and logging every action. We help teams cut busywork and unify AI tools across departments – helping companies adopt AI in days rather than months.

We unify your contracts, service consumption, and customer relationship context so that your revenue, success and sales teams can operate from the same ground truth. With everything centralized, you can proactively react to customer signals for upsell and churn while billing is seamlessly handled in the background.

Frizzle uses AI to grade handwritten math assignments for teachers and transform them into rich analytics and differentiated assessment to help personalize instruction for every student. Teachers spend over 10 hours a week or 25% of all their work grading - Frizzle does it in minutes. Frizzle is the most valuable piece of software for teachers ever, as it eliminates the most time-consuming part of their workflow so they can focus on teaching. Frizzle shifts education from waterfall to agile learning. Instead of waiting for end-of-unit tests to discover gaps, teachers get continuous, real-time insight into student thinking from everyday work. Feedback becomes immediate, instruction adapts weekly, and learning iterates (measure, adjust, improve) so every student progresses faster with less teacher burnout. Frizzle was named an official White House AI Education Partner alongside OpenAI and Meta: https://www.whitehouse.gov/edai/. Frizzle was co-founded by Abhay Gupta and Shyam Sai, who met in high school over 10 years ago.

When enterprise agents fail in production, the conditions that caused the failure are critical: user state, data, tool calls, and context. Without a way to recreate these conditions, teams can't fix what broke. Playgent provides infrastructure to create high-fidelity sandbox environments for AI agents. Our environments come packaged as a single MCP url where tool calls are mocked, authentication is abstracted away, and test data can be initialized via natural language or JSON specifications. Teams can use Playgent to reproduce production failures in safe, scoped environments that accurately reconstruct state. Finally, export runs as OTel traces from Playgent's environment to plug directly into your observability tools or RL pipelines.

Epicenter is an ecosystem of open-source, local-first apps. We store all your work—notes, transcripts, chat histories—in a single folder of plain text and SQLite. Every tool we build shares this memory: your text editor, personal assistant, etc.. It's open, tweakable, and yours. Grep it, open it in Obsidian, host it wherever you like. The choice is yours. Our vision is to build a personal workspace where you own your data, choose your own AI models, and replace siloed apps with open, interoperable alternatives. All while preserving authenticity and being free and open source. ❤️

Qualify.bot helps commercial lenders and loan brokers process business loan applications with 4x higher conversion rates. Our AI voice calls eliminates 8+ hours of manual work per loan, from lead qualification to document collection & follow-ups.

The Operating System for Health AI: we deploy, govern, and scale AI agents across healthcare organizations.

Doe is where AI agents actually do your work. Connect your tools, tell Doe what you need, and agents handle it. When you want to do something yourself, Doe makes you faster and smarter. The boring stuff disappears. Everything else gets better.

Stockline is an AI-native ERP for food wholesalers. Our agents eliminate human labor for repetitive tasks, starting with order entry. Our goal is to replace clunky software with the next generation of ERPs, built with AI employees at their core. Team is 2 Polytechnique alums who dropped out of Stanford and MIT. Mariem is daughter of the fish industry and Moncef started coding and building softwares at 13.

Certus AI is replacing the restaurant phone line with Voice AI. Restaurants lose up to $100,000 per year per location from missed calls, lost orders, and abandoned hold lines. Staff are overwhelmed. IVRs frustrate customers. Call centers are expensive and impersonal. It’s 2025. Guests don’t leave voicemails or wait on hold. They just move on. Certus is an AI voice agent built for restaurants. It answers every call, 24/7 — taking orders, processing deliveries, booking reservations, upselling, and handling complaints in English, Spanish, French and more. Certus is built to manage the phone line end to end, from the customer call to the restaurant tech stack, with zero human intervention required. It currently integrates with industry-leading systems like Toast, Square, Clover, UberEats, DoorDash, and more. We’re building the voice layer of the modern restaurant — the employee they’ll never fire. We started Certus because we lived the pain. Gurveer (CEO) grew up answering phones in his family’s restaurant and helped operate them, growing from 1 to 11 locations in 7 years. Later, he and Adam (CRO) ran a restaurant growth startup to help others increase revenue, but kept watching clients bleed cash because no one picked up the phone. So we built the solution the industry always wished existed. Until now, this problem was considered unsolvable. But Voice AI has finally crossed the conversational chasm and 72% of consumers now prefer AI over humans as long as it means faster and better service. More importantly, the market is begging for this. The North American restaurant industry crossed $1 trillion in 2024, and it's projected to hit $1.5 trillion in 2025. Yet over $100 billion is still lost annually to missed calls, human error, and outdated tech. As the market continues to grow, so do the losses! Our customers say it best: - “Certus changed my life overnight.” - “We were losing the ability to give great in-house service — the phone was killing us.” - “70% of my business comes through the phone. That’s mine and my 16 staffs livelihood.” - “Before Certus, I used to lose 40 - 60 calls a day…. now my printer just stays printing!” - “I’ve been in the business 38 years. I’ve been waiting for this since then.” Certus is here to fix the $120B phone problem — one call at a time. And in doing so, we’re redefining how the restaurant industry communicates forever, starting with the phone line.

Janet AI (tryjanet.ai) is the first AI-native ticket management system, built for modern engineering teams and tool stacks. Janet doesn’t wait for your manual work. - Ideas, bug reports, and feature requests get tracked directly from meetings/Slack/Discord/SMS. - Duplicate or related issues are automatically detected to reduce noise as you scale. - Tickets are auto-moved when GitHub PRs resolving them are opened and merged. - You can reply to issue reporters in Slack/Discord directly from Janet when a ticket is resolved. - We bring all your tickets to your Cursor/Claude Code's context so coding agents can fully understand, cluster, prioritize, and resolve issues - the time spent on thorough ticketing finally has tangible ROI (not just a chore). - And more! Founders, product leaders, customer success, and engineers all love Janet: cross-team communication, collaboration, and execution are made seamless. That’s why users repeatedly switch away from Linear, Jira, and others after trying Janet for just a single project/sprint. Check out tryjanet.ai to get started today!

PARES is the single platform commercial real estate brokers need for their entire workflow, from chasing leads to closing deals and everything in between. With our platform, brokers can: 1) Automatically update real-time transaction data in our CRM 2) Create lists of target properties, skip-trace, and easily navigate outbound calls 3) Underwrite deals with our AI Underwriting Agent 4) Create OMs/BOVs in minutes with our AI Marketing Agent Check us out at https://www.pares.ai/

Opennote is the one space for everything you study, turning chaos into clarity. Most learners struggle with scattered knowledge across different apps and tools that don't understand their learning style. Opennote changes that with a note-taking platform where AI knows your style, connects to your existing knowledge bases and the web, and provides proactive feedback and edits—right where you're already working.

Sagekit is an AI workspace where chat and documents are deeply connected. Think ChatGPT meets Notion. Chat with AI, research topics with web and Reddit data, and build real documents you and AI can both edit—all in one workspace.

Keystone is an AI engineer that joins your team and understands your product from codebase to production. It can triage tickets, fix bugs, and automatically resolve incidents, autonomously.