yc-w24
(18)
Ambria (YC W24)
Ambria is a San Francisco startup building AI agents for the industrial world - production-ready agents that automate back-office operations across manufacturing and distribution. Founded by UIUC classmates Praneeth Guduguntla and Arman Rafati, the company went through Y Combinator's Winter 2024 batch, where it first launched as Glimmer, an AI search engine for massive PDFs, before turning its document-reasoning expertise toward the paperwork-heavy back offices of industrial companies.
Clarum
Clarum is a San Francisco AI startup (YC W24) building the intelligence layer for private capital. It began as an AI associate that compresses private-equity due diligence from weeks into minutes, letting firms upload data rooms and questionnaires and get transparent, sourced answers to hundreds of questions. It has since broadened toward structuring a firm's proprietary documents - deal memos, diligence notes, returns data - into a unified model that AI agents can query, so investors can finally ask cross-portfolio questions that were previously buried in files.
Infinity
Infinity is a Bengaluru-based cross-border payments platform that lets Indian freelancers, exporters, and small businesses receive money from global clients through multi-currency virtual accounts. It converts foreign payments to INR at live FX rates with a flat 0.5% all-inclusive fee, settles funds in about a day, and handles RBI compliance paperwork like FIRA automatically. Founded in 2024 by brothers Sourav and Sidharth Choraria, the company is part of Y Combinator's Winter 2024 batch.
Integuru
Integuru is a San Francisco startup (YC W24) building an AI agent that reverse-engineers the internal APIs behind websites and apps that have no official API, then generates fast, production-ready integration code. Instead of brittle browser automation, Integuru analyzes network requests and cookies to produce direct API calls that complete in about three seconds with 99.9%+ success. The open-source agent has over 4,700 GitHub stars, and the hosted managed service powers more than a million API calls a month per platform across healthcare, logistics, proptech, and legal.
ion design
ion design is a San Francisco AI company (YC W24) building tools that let non-engineers ship real UI changes to a live codebase. It started by turning Figma designs into clean React code, grew into a Figma-like visual editor that opens branches and pull requests against your GitHub, and now runs autonomous AI product-design agents that create and test on-brand pages to grow revenue. Founded in 2023 by Samraaj Bath, it targets the gap between people who can ship code and the PMs, designers, and marketers who cannot.
jo
jo is a voice-first personal AI agent for macOS that runs on your Mac and a private, per-user cloud machine. Rather than waiting to be asked, it proactively summarizes what is on your screen, drafts emails, manages your calendar, clips relevant content, and keeps up with the loose ends of work and life. Built natively in Swift for Apple Silicon and backed by Y Combinator (W24), jo reaches users across Mac, web, iMessage, Telegram, and WhatsApp while keeping personal data local and out of model training.
Miden
Miden is a Nigerian fintech building payments infrastructure for businesses across Sub-Saharan Africa. Through a single API, companies can issue virtual and physical cards in USD, NGN and multi-currency formats, run banking-as-a-service programs, open business accounts, and handle bill payments - the plumbing that lets other companies launch financial products without building banking rails from scratch. Founded in 2022 and part of Y Combinator's Winter 2024 batch, Miden has issued over a million cards and processes billions in transaction volume.
OneGrep
OneGrep (YC W24) is a New York-based developer-tools startup building AI agent infrastructure for DevOps. It began as a DevOps copilot that fine-tuned models on real-time telemetry to help engineers resolve incidents faster and cut observability costs, and has since expanded into tooling that lets AI agents discover, correlate, and safely operate the many SaaS and MCP-based tools engineering teams rely on. Founded by ex-Disney, Amazon, and Coinbase engineers Achintya Ashok and Brian Cripe, it went through Y Combinator's Winter 2024 batch.
Penciled
Penciled is an AI front office assistant for physical therapy clinics. It plugs into the clinic's existing EHR - primarily WebPT - to text and call patients, book and confirm appointments, complete plans of care, send reminders, and fill last-minute cancellations from an automated waitlist. Founded by Shawn Shivdat and Deniz Sert in the Y Combinator W24 batch, the company now serves 200+ providers across 50+ clinics and books thousands of appointments a month.
Reprompt
Reprompt builds AI agents for location data. Mapping companies like Foursquare, TomTom, and Radar use its agents to keep points-of-interest and business records current - verifying hours, status, ownership, and dozens of other attributes by cross-referencing web, social, government, and news sources. Founded in 2024 by ex-Mapbox and ex-Robinhood operators, the company turns work that once took weeks of manual research into runs that finish in under an hour.
Selera Medical
Selera Medical is a Y Combinator-backed (W24) medical device startup building MILO - minimally invasive lymphatic offloading - a one-time, catheter-based procedure that treats fluid overload in chronic heart failure. Instead of a lifelong drug regimen, Selera taps the body's lymphatic system to drain trapped fluid from the interstitial space, aiming to break the cycle of repeat hospitalizations that defines late-stage heart failure. Founded in 2023 by CEO Stacie Arechavala and CTO Kevin Bui, both former Stanford Biodesign fellows.
The New Money Company
The New Money Company (YC W24) is a San Francisco fintech that protects B2B invoices against nonpayment and moves the money across borders. Its product, Numo, underwrites a buyer's creditworthiness instantly, guarantees the seller gets paid even if the buyer defaults, and settles funds to more than 80 destinations - with an early focus on getting international contractors in emerging markets paid in USD within seconds. Founded in 2023 by three former Hologram operators, it aims to let businesses sell into new markets without carrying the risk of a buyer who never pays.
thorntale
thorntale (YC W24) is a San Francisco software company that built presentation tools for data storytelling. Instead of screenshotting charts from Looker or Snowflake into Google Slides, teams could connect live data sources directly into decks, so charts stayed interactive and up to date - even re-segmentable during a live Q&A. Founded in 2024 by data scientist Dori Wilson with engineers Ellen Hui and John Stimac, the company later pivoted toward an AI-powered presentation editor and shipped a free AI Presentation Review tool before winding the core Presentations product down at the end of 2025.
Yarn (YC W24)
Yarn is an AI-native platform that lets go-to-market teams make agency-quality product, sales, and marketing videos in minutes instead of weeks. Founded during Y Combinator's Winter 2024 batch by Jasper Story and Nicole Atack, Yarn treats video like a document: you write a script, and its stack of AI tools handles voiceovers, screen recordings, part-synthetic talking heads, brand-styled overlays, and generative footage. The pitch is speed and cost - videos that would take an agency weeks and thousands of dollars, produced in-house in under 20 minutes.
CrowdVolt
CrowdVolt is a New York-based, Y Combinator-backed marketplace that lets fans buy and sell tickets to live events - starting with raves and EDM concerts - through a bid-ask model similar to StockX. Buyers name the price they are willing to pay, sellers set an ask, and trades clear automatically when the two meet. The platform handles secure payments and automated ticket transfers to cut fraud, inflated fees, and the opacity of the traditional resale market.
LemonSlice
LemonSlice is a San Francisco AI research and product lab that turns a single photo into a real-time, talking video avatar - the visual face for voice agents and chatbots. Its Lemon Slice-2 model is a purpose-built, large-scale video diffusion transformer that generates every pixel from scratch to produce expressive, full-emotion talking characters (human or cartoon) that livestream at conversational speed. Founded in 2024 by three PhD-creators (formerly Infinity AI), the company raised a $10.5M seed led by Matrix Partners and Y Combinator to make all video interactive.
Zaymo
Zaymo is a YC W24-backed B2B SaaS company based in Lehi, Utah that turns static marketing emails into interactive mini-apps. Built on AMP for Email technology and deeply integrated with Klaviyo and Shopify, Zaymo lets ecommerce brands embed one-click purchasing, subscription management, review collection, and gamified elements directly inside the inbox — no redirect required. Customers report 12–15X ROI, 24–52% reductions in subscription churn, and conversion lifts that static email simply cannot match.
Zep AI
Zep AI builds the context engineering infrastructure that makes AI agents actually useful. Their platform - powered by a temporal knowledge graph called Graphiti - gives agents persistent memory across sessions, letting them track what users said, what changed, and when. Founded in 2023 and backed by Y Combinator (W24), the San Francisco team hit $1M ARR within months of launch and now serves 240+ customers including Fortune 500 companies. With 25,000+ GitHub stars on Graphiti and a published arXiv paper, Zep is quietly becoming foundational infrastructure for the AI agent era.