YC-Backed Companies

9 Mothers

AI weapon systems

AICE Power

Submarine drones for defense

ANORIA

The first wearable that reads your emotions to enhance your EQ.

AbInitio Bio

The Intelligence layer for Drug Manufacturing

Adialante

Cancer screening without barriers

Advanced Metal Research

Machine intelligence for American Welding

AgentPhone

Phone Numbers for AI Agents

Alchemize

AI-Native Customs Brokerage

Allowance

Scoped payment credentials for AI agents

Amboras

Let AI sell your stuff on autopilot

Andco

End-to-end case workups for personal injury firms.

Andustry

We help manufacturers find suppliers for industrial goods.

Apollo Atomics, Inc.

We make the most compact nuclear machines.

AquaShield

AI water leak detection for buildings

Ara

Ara is a non-invasive AI cursor that executes tasks on your computer.

Archer

Reward. Anything.

Arctic Health

AI-native credentialing and contracting for healthcare

Arden

AI agents that automate SOX control testing.

Ardent

Database sandboxes for Agents

Arga Labs

Real-world sandboxes to test agents and agent-facing software

Arlo Industries

Passive aerial sensing mesh to track drones and missiles

Armature

Armature helps companies monitor and optimize the agent experience.

Arzana

AI automation for the manufacturing office

Asendia AI

AI Recruiters for Staffing Agencies and Enterprise

Aseon Labs

Robotic pitstops for self-driving cars

Aster

The First AI-Native AI Research Lab

Astraea

Agents that accelerate clinical trials.

Autostep

Uncover repetitive tasks and automate them

Auxos

Digital twins for market research

Avea Robotics

Control your robots from anywhere in the world.

BentoLabs AI

The monitoring and learning layer for long-running agents

BioStack Platforms

Real world training envs for healthcare AI models

Everyme

The #1 private social network

Firebase

Build and grow iOS, Android, and Web apps.

Fobo

Sell to people nearby.

Freshplum

Analytics with action

Genius

Music Intelligence

GlassMap

Location sharing. Acquired by Groupon in 2013.

GoCardless

We’re building the world’s bank payment network.

HackerRank

Change the world to value skills over pedigree

Hungry Labs

Now part of Snaplayer.

Imgix

The platform for your visual media.

Interstate

Create & Share Product Roadmaps

Kicksend

Send and print photo albums with people you love. Acquired by Lyft

Launchpad Toys

Creativity at Play. Tablet toys. Acquired by Google, 2015.

LeadGenius

LeadGenius is an account-based marketing and lead generation…

Leaky

Online auto and business insurance. (Acquired 2013)

MarketBrief

Generate stories from SEC filings.

MixRank

Data products for sales, marketing, finance, recruiting, and more.

OneSignal

Engage customers through personalized omni-channel messaging

Opez

Yelp for service pros.

Pagelever

Facebook analytics. Acquired by Unified in January 2013.

Parse

Parse is the easiest way to build apps.

PayDragon

Hyperlinking the real world.

Perfect Audience

Self-service display advertising for SaaS and online retail.

PhoneSys

The Phone System for Sales Teams.

Picplum

Proxino

Javascript proxy.

Quad

Quad is where college students get things done.

Quartzy

Marketplace for life science supplies.

Realm

Better data structures = no DB.

Rentobo

The easiest way to find a tenant. Rentobo is a tool that makes it…

Ridejoy

Long-distance carpooling marketplace. Shut down in early 2013.

Science Exchange

Powering scientific outsourcing

Segment

Software and APIs to collect, clean, and control customer data.

Sift

The Leader in Digital Trust & Safety

Snapjoy

Photo library.

Streak

Streak transforms Gmail into a powerful CRM

Stypi

Realtime collaborative coding

TapEngage

Touch-friendly marketing, acquired by Dropbox

Vapor

In-video advertising.

Verbling

Language learning through video chat.

Videopixie

Marketplace for Video Production Services. We help you hire the best…

Vidyard

Video for business.

Zenbox

Brings dozens of SaaS's (Mailchimp, Stripe, Shopify, Salesforce,…

Zeus

Tech-enabled property manager focused on corporate rentals; Acquired…

Zigfu

Layer above Kinect.

1000Memories

Memorial sites.

AdGrok

Easy SEM software. Acquired by Twitter in 2011.

AeroFS

Secure Enterprise Collaboration.

AnyList

One app for stress-free shopping, cooking, and meal planning.

Brushes

iPad drawing software.

Chartio

Chartio is changing how companies work by building the best…

Chirply

Crowdsourced design marketplace for paper goods.

DemandSphere

SEO & Content Marketing Intelligence

Docker

Software development platform.

Fanvibe

Fridge

Disposable social networks.

FutureAdvisor

The online financial management service for everyone.

Gantto

Better Microsoft Project.

GazeHawk

Eyetracking using webcams.

Habit Labs

Friends motivate one another: I'll do x if you do y.

Hipmunk

Hipmunk takes the agony out of searching for flights, accommodations,…

Homejoy

platform for home service professionals

Koduco

iPad games.

Leftronic

Business dashboards

MessageParty

Local chat.

Opzi

Q&A for businesses.

PadMapper

Map-based apartment search.

PagerDuty

Real-time visibility into critical apps and services all in one place.

Post.fm

New email inbox.

Presto

Digital meets physical for big chain restaurants

Pribbit

Like Twitter but you post others' status.

Rapportive

Add profiles to email.

Ready For Zero

Personal debt and credit management. Acquired by Avant in 2015.

Recurse Center

The retreat where curious programmers recharge and grow

Simperium

Simplenote (simplenote.com) and the Simperium platform for syncing…

Tapzilla

Woot for iOS apps.

Teevox

Teevox

Upbeat

Upbeat: Building the next generation of Public Relations (PR)

Whereoscope

Location-aware smartphone application that enables parents to keep…

WorkFlowy

WorkFlowy is a better way to manage information. It provides a simple…

inDinero

Financial dashboard for businesses.

AdThrow

Bump

Bump, Flock, Photoroll (unreleased) => Google Photos

CarWoo

The best way to buy a new car.

DailyBooth

Directed Edge

Product recommendations.

Fanchatter

FanChatter aggregates, amplifies and empowers fan content on every…

Flightcaster

GraffitiGeo

We let you know where to go and what to get once you get there.…

HighlightCam

HighlightCam edits video, automatically!

Instantq

Jobspice

Lingt

Lingt provided a web-based platform for learning languages leveraging…

Listia

Mobile marketplace for trading used goods.

Lockitron

Lockitron makes electronic locks you can control locally from your…

Mixpanel

Mixpanel is event analytics for builders that need answers.

NudgePad

Online IDE. We joined Microsoft in 2014.

Olark

The best live chat software on the planet. We help you build…

Plurchase

RentHop

Apartment rental marketplace

RethinkDB

The open source database for the realtime web.

RoboHR

Stackq

Stripe

Economic infrastructure for the internet.

Tuxebo

Tuxebo was a platform for renting things

Wakemate

WePay

Payments for platform businesses.

Anyvite

BackType

BackType was an analytics company acquired by Twitter in 2011

CO2Stats

Social and environmental web analytics. Acquired in December 2016.

Claimspotting

Claim and conquer your city

Cloudant

NoSQL Database-aaS. Acquired by IBM in 2014. Now IBM Cloud Data…

Frogmetrics

Job Alchemist

JustSpotted

Acquired by Google in 2011

OhLife

People & Pages

Picwing

Photo Sharing platform for families

PlayReader

Poll Everywhere

Interactive meetings and presentations

Popcuts

Popcuts is an online music store where fans participate in the…

Posterous

Dead simple blogs by email

Precognate

Slinkset

Votable lists

Snipd

Team Apart

Ticket Stumbler

Treehouse

Youlicit

Anywhere.FM

Appjet

Biographicon

Blue Frog Gaming

Bountii

Clickpass

ContestMachine

Roll your own contest or giveaway. No longer in business.

Disqus

Add comments to your website.

Dropbox

Backup and share files in the cloud.

Eivod

Fuzzwich

Hello Chair

Meetyu

Reble

P2P Music Sharing

SocialPicks

SocialPicks was a platform where stock investors could exchange…

Songkick

Splashup

ZumoDrive

Media in the cloud

iJigg/Top440

Jamglue

Jumpchat

Likebetter

OMGPop

An independent flash game studio.

Pollground

Online polls.

Scribd

World's largest online library.

Shoutfit

Talkito

Thinkature

Xobni

Zanbazaar

Community-curated catalogs for product recommendations

Clickfacts

Infogami

Kiko

We're the best online calendar solution to ever exist. Period.

Loopt

Memamp

Parakey

Reddit

The frontpage of the internet.

Simmery

TextPayMe