Y Combinator

RS

Resend

Email API for developers — built on React.

AS

Ashby

All-in-one recruiting platform built for elite teams.

PH

PostHog

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

NU

Nourish

Insurance-covered nutritional counseling.

IF

Infisical

The open-source secret manager.

TR

Trigger.dev

The open-source background jobs framework.

AR

Arcade

Interactive product demos in minutes.

MI

Mintlify

Documentation that converts.

RM

ReadMe

Beautiful, personalized developer hubs.

LF

Langfuse

Open-source LLM engineering platform.

BL

Brilliant Labs

Open-source AI glasses.

AS

AssemblyAI

Speech AI models for production scale.

DG

Deepgram

Voice AI platform built for speed and accuracy.

PM

Permit.io

Authorization as a service.

HT

Hightouch

The leading Composable CDP & reverse ETL platform.

UK

Unkey

Open-source API authentication and authorization.

NC

NocoDB

The open-source Airtable alternative.

PS

PadSplit

Affordable housing through shared homes.

VC

Vouch

Insurance built for startups.

E2

E2B

Sandboxes for AI agents.

LU

Lutra

AI for everyday data work.

TV

Tavus

AI-generated personalized video.

AT

Attention

AI sales coach + assistant for sales reps.

PR

PhotoRoom

AI image editing for commerce.

LP

Loops

Email for modern SaaS companies

DB

Dub.co

Open-source link management for modern teams

CW

Chatwoot

Open-source customer support platform

KR

Krea

Real-time AI generation for creative professionals

RM

Rainmaker

Making droughts end

HC

Helicone

Open source LLM observability for production AI

EX

Exa AI

Neural search API designed for AI applications

FC

Firecrawl

Web scraping API built for LLMs

E2

E2B

Secure code execution sandboxes for AI agents

HL

Highlight

Open source full-stack monitoring and error tracking

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

JM

Jam

One-click bug reports that developers actually love

AP

Activepieces

Open source business automation platform

MM

Marimo

Reactive Python notebooks you can deploy as apps

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

TE

Terra

Design and sell products in minutes

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

MI

Midship

AI for SOX testing

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

AR

Azalea Robotics

Automating airport baggage handling with robots

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.

HA

Hazel

AI-enabled procurement for government

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

HP

Hoppscotch

Open source API development ecosystem

AG

Agno

Open source framework for multi-modal AI agents

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

PK

Portkey

AI gateway and LLMOps platform for production

VA

Vapi

Voice AI infrastructure for developers

RA

Retell AI

Build, test, and deploy voice AI agents

AS

AssemblyAI

Audio intelligence API for developers

CF

Coframe

AI that continuously optimises your website copy

GL

Glif

Build and share AI-powered mini apps

IC

Infracost

Cloud cost estimates in pull requests

EA

Earthly

Containerised CI/CD builds that run anywhere

BN

Bun

Incredibly fast JavaScript runtime and toolkit

WG

WunderGraph

API integration platform and GraphQL federation

SL

Slope

B2B buy-now-pay-later payments

ES

Escape

API security testing and DAST for developers

PT

Patch

Carbon removal and climate project infrastructure

OP

Opus Clip

AI video repurposing for short-form content

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

BM

Bemi

Automatic audit trails for PostgreSQL without code changes

GG

Gigs

Launch a mobile service that runs itself

CC

Casca

AI loan origination that lets banks process 10x more

UP

Upflow

The modern accounts receivable platform for B2B

SL

Slash

Business banking built for internet entrepreneurs

RM

Roam

Buy a home by taking over a 2-3% mortgage from a seller

SF

Synthflow AI

No-code AI phone call agents for any business

RZ

Row Zero

The fastest spreadsheet in the browser

NM

Numeral

Automated sales tax compliance for modern commerce

SR

SurrealDB

The ultimate multi-model database

ST

SuperTokens

Open source authentication that is 10x easier

UM

Umami

Simple, fast, privacy-focused web analytics

OR

OpenReplay

Open source session replay and debugging suite

HD

HyperDX

Open source observability platform

DF

Dittofeed

Open source customer engagement platform

MD

Medusa

Building blocks for digital commerce

SL

Saleor

Open source GraphQL-first e-commerce platform

OW

Open WebUI

ChatGPT-style UI for any LLM

LL

LiteLLM

Call 100+ LLMs with one interface

DE

DeepEval

The open source LLM evaluation framework

FW

Flowise

Drag-and-drop UI to build LLM flows

OO

OpenObserve

Open source observability with 140x lower storage costs

SC

Screenpipe

Open source AI-powered screen and audio recorder

SA

SuperAgent

Open source AI agent platform