Y Combinator's Machine Learning Portfolio

Epsilon Health operates an AI-native radiology practice for medical imaging interpretation.

Rational is an AI-powered accounting firm designed to automate accounting end-to-end.

NewsCatcher is a news API that provides news articles and information services

AI-Driven Tech & Space Optimization to Scale Restaurants

Watto AI uses AI bots to provide natural interactions in collecting leads and automate customer support.

Unsloth makes reinforcement learning and finetuning easier and more efficient.

LeapYear develops technology for enterprises to securely unlock value from their most sensitive data assets.

Vottun is a platform that certify and track data for optmizing business processes using blockchain and DLT technology.

Arthur is a platform that monitors, measures, and improves the performance of machine learning models.

Elucidata delivers ML-ready biomedical molecular data that is curated to accelerate drug discovery.

Phiar's Ultra-lightweight Spatial AI Engine enables vehicles to perceive its surroundings, and powers our first use case in AR Navigation.

Aviary makes large video collections searchable and understandable, mimicking human video comprehension.

Wallaroo provides an enterprise AI platform that enables clients to deploy ML and analytics projects into production.

Simplex generates on-demand vision datasets from 3D scenes to train AI models helping companies save time in data collection.

AI Sell is an artificial intelligence-driven software that assists eCommerce businesses in enhancing their sales performance.

Promi revolutionizes e-commerce pricing by implementing dynamic, personalized discounts, maximizing customer engagement and satisfaction.

Jarmin offers machine-learning engineering services to help companies build and deploy AI/ML systems.

Within turns how a company actually works into structured, AI-ready context, then puts agents to work alongside people. Formerly Klarity.

3E Network Technology Group provides B2B IT solutions and develops AI and blockchain data center infrastructure services.

Soteris is a machine learning services company that offers artificial intelligence-based pricing tools to the insurance business.

1build utilizes machine intelligence to convert building blueprints into material shopping lists and cost estimates.

Salt Security provides an API protection platform designed to prevent attacks by leveraging machine learning and AI.

Applied Kinetics builds and deploys specialized AI employees for mission critical industries.

Intrusion detection software for remote outdoor sites using existing CCTV

Robocurve builds open-source evaluation tools and benchmarks for measuring real-world capabilities of AI and robots.

Huscarl provides AI-driven actuarial advisory and insurance analytics for corporate risk managers and finance leaders.

AfterQuery develops training data solutions for frontier AI and foundation model development.

Attimet develops artificial intelligence-driven quantitative research systems for financial markets.

Hudson Labs is software that extracts hard-to-find information in a public company filing like annual reports.

PRINCEPS develops AI-native software for compliance, operational resilience, and administrative workflows in the energy sector.

Experiential Labs provides an open-source AI gateway that unifies cloud models, self-hosted hardware, and custom API keys.

Locke is an applied AI company building AI agents that help companies and governments work together.

Prodigy Research trains foundation models and autonomous AI agents for quantitative trading across global financial markets.

Rekursiv AI develops autonomous systems that hypothesize, perform research, and design machine learning experiments.

CoArena provides a live evaluation platform and public leaderboard where AI computer-use agents race side-by-side on real-world tasks.

OneTriangle optimizes LLM inference speed and cost by transferring the KV cache from smaller prefill models to larger decode models.

Tracer is an AI platform that helps companies use the right AI model for each task by combining models, company context, and tools.

Codag cuts coding-agent costs by optimizing large tool outputs like logs and test results so agents consume fewer tokens.

Magma enables companies building AI agents to monetize their workflow traces and interaction data by licensing them to AI labs.

Insurf provides AI-based tools for managing prior authorizations, denial appeals, and health plan cost modeling.

AI Customer Service Platform for Enterprises

CLIPr automatically generates police report drafts from body-worn camera audio to cut in half the time required to document

ROSS Intelligence builds artificially intelligent tools to the legal world.

Clau is a real estate agency that assists with buying, selling, and renting residential and commercial properties.

ClosedLoop is healthcare's data science platform, helping healthcare organizations use AI / ML to improve outcomes and reduce costs.

HyperGlue is a natural language platform designed to transform unstructured data into real-time business insights.

Mundo AI develops data, evaluations, and applied research for frontier AI labs and companies.

Platform for creating ML models simply by describing problems in natural language

Escape - API discovery and API security platform that leverages generative AI to discover and secure all exposed APIs.