Companies funded by Y Combinator

RS

Resend

Email API for developers — built on React.

PH

PostHog

The single platform to analyze, test, observe, and deploy.

IF

Infisical

The open-source secret manager.

TR

Trigger.dev

The open-source background jobs framework.

MI

Mintlify

Documentation that converts.

RM

ReadMe

Beautiful, personalized developer hubs.

LF

Langfuse

Open-source LLM engineering platform.

LP

Loops

Email for modern SaaS companies

CW

Chatwoot

Open-source customer support platform

RM

Rainmaker

Making droughts end

HC

Helicone

Open source LLM observability for production AI

FC

Firecrawl

Web scraping API built for LLMs

IN

Instant

Realtime database for modern applications

NG

Nango

Open source platform for product integrations

EV

Evidence

Open source business intelligence with Markdown and SQL

LG

Lago

Open source billing and metering for usage-based pricing

AP

Activepieces

Open source business automation platform

TR

Trim

A foundation model for physics.

MF

Maritime Fusion

Fusion reactors for ships

BY

Bystreet

Your key to the hotel market.

PH

Paratus Health

Medical Voice Agents for Patient Management

RO

Roark

Test, monitor, and improve your voice agents

SP

Spott

AI-native ATS/CRM for recruiting firms

RS

Reditus Space

Reusable Satellites for zero-g manufacturing

MI

Misprint

Robinhood for Pokemon cards

ML

Miyagi Labs

AI tutors for exam prep

OU

Outlit

Customer Context for Agents

NI

Nitrode

Data for reasoning agents in dynamic environments

PR

Promptless

An AI teammate that automatically updates customer docs

BU

Bud

Agent with a computer

OU

Outship

Hire amazing engineers by seeing how they use AI

ME

Mentra

Building the open source smart glasses operating system.

AR

Artifact

A Collaborative, AI-native IDE for Hardware Engineers

BU

Browser Use

Leading open-source web agent project with 50k stars in 3 months

ER

Ergo

AI agents and unified data layer for revenue teams

CO

CopyCat

AI agents built for insurance.

WO

Woz

Claude Code plugin that reduces token consumption and cost by 50%

LA

Lopus AI

Analytics built for Growth

10

10x

AI Sales Teams for Dental Practices

TA

Toothy AI

AI for insurance verification and billing at dental clinics

CO

Conntour

AI to monitor thousands of security cameras.

VH

Vocality Health

Voice AI for medical language translation

AL

Alice.tech

AI-driven exam prep

FA

Fazeshift

AI agent for Accounts Receivable

CE

Central

Payroll, benefits, state compliance for startups

OU

Outerport

AI engineering scientists - search PLMs, read drawings, run simulations.

MA

Mica AI

Replace the humans fixing bad data

CA

Capitol AI

Sovereign operating system for intelligence

RE

RentFlow

First Buy Now Pay Later solution for Commercial Rent

RA

Rastro

The fastest way to launch product catalogs

DA

Dataleap

The world's first vibe working platform

HA

Haystack

AI review layer that decides which code changes need attention

WI

Winfunc

AI-native security engineering for mission critical codebases

FA

FINNY AI

The organic growth engine for financial advisors

LA

Lighthouz AI

Freight bill audits and AP/AR automation for brokers

PR

Proxis

The platform for enterprise AI agent automations

RE

RetroFix

Automate any workflow using plain english

CI

Corgi Insurance

Building an AI financial infrastructure company

MD

mdhub

AI-native operating system for behavioral health

CH

Cheers

Win local search on ChatGPT and other LLMs

SI

SimCare

AI avatars to scale healthcare training

AA

Arva AI

AI Agents to scale AML, KYB and KYC operations

AF

Affil.ai

AI Affiliate Network For Financial Companies

OW

Oway

AI Infrastructure for America's Empty Truck Space

OL

Orca Launcher

A launcher that turns Minecraft into a game platform

TF

The Forecasting Company

Foundation models for time series

ZA

Zeit AI

From data to enterprise insights in just a few words

DI

Distro

AI co-pilot for sales reps at industrial wholesale distributors

BI

Biocartesian

Converting biology into digital molecular maps

AN

Anthrogen

Training the next generation of protein foundation models

CH

Codes Health

Medical Record Retrieval with Zero Human Error

EN

Entangl

Find and resolve issues in data center engineering using AI

HE

HeartByte

GenAI Interactive story. Creator write fictions 10x faster.

EL

Ellipsis

AI code reviews and bug fixes

IN

InQuery

Intelligent Medical Record Reviews

ZA

Zaymo

Interactive email builder for ecommerce brands

EN

Encore

Developer-first backend framework with built-in infra

BM

Beam

Serverless infrastructure for AI and ML workloads

TW

Twenty

Open source CRM built for modern teams

RQ

Requestly

Browser extension and proxy for API mocking and testing

TL

Traceloop

Open-source LLM observability with OpenTelemetry

VA

Vapi

Voice AI infrastructure for developers

RA

Retell AI

Build, test, and deploy voice AI agents

IC

Infracost

Cloud cost estimates in pull requests

BN

Bun

Incredibly fast JavaScript runtime and toolkit

SL

Slope

B2B buy-now-pay-later payments

ES

Escape

API security testing and DAST for developers

GR

Greptile

AI that reads your entire codebase to catch bugs

MT

Mastra

The TypeScript framework for building AI agents

BK

Blacksmith

2x faster GitHub Actions with zero config changes

GG

Gigs

Launch a mobile service that runs itself

UP

Upflow

The modern accounts receivable platform for B2B

SL

Slash

Business banking built for internet entrepreneurs

NM

Numeral

Automated sales tax compliance for modern commerce

ST

SuperTokens

Open source authentication that is 10x easier

HD

HyperDX

Open source observability platform

DF

Dittofeed

Open source customer engagement platform

LL

LiteLLM

Call 100+ LLMs with one interface

SC

Screenpipe

Source-available screen and audio memory for AI assistants

SA

SuperAgent

Open source AI agent platform