πŸš€ Y CombinatorΓ—β˜€οΈ Summer 2017

YC S17: The Bridge Between DTC Hype and Hard Tech Reality

125 startups in this batch

What Was YC SUMMER 2017?

Summer 2017 was defined by the peak of the Direct-to-Consumer (DTC) explosion and a pivot toward high-stakes hard tech and climate infrastructure. While the broader market was distracted by the first major ICO craze, this cohort focused on digitizing legacy industries like construction and energy storage, operating in a macro environment of low interest rates and aggressive growth expectations.

What These 125 Startups Built and Proved

This batch validated that vertical integration was the primary lever for disrupting stagnant sectors like commercial construction and recruitment. They proved that industrial buyers were finally ready for nanotechnology and decarbonization if it offered cost-parity, and that niche marketplaces could thrive by aggregating highly specialized, pre-vetted talent pools that LinkedIn ignored.

What Failed and What to Learn From It

Many startups in this cohort hit a wall when the operational complexity of physical supply chains and manual coordination outpaced their software margins. The core failure was often an over-reliance on human-heavy operations to bridge the gap between their software and the real world, leading to unsustainable Customer Acquisition Costs (CAC) as the DTC and marketplace sectors became oversaturated.

The Relaunch Opportunity in 2026

A solo builder today can use AI-agentic workflows to replace the massive coordination teams these 2017 founders had to hire for project management and recruiting. The 2026 wedge is rebuilding these vertically integrated models where LLMs handle the messy middleβ€”the vetting, scheduling, and procurementβ€”allowing a lean team to achieve the scale that previously required hundreds of employees.

10by10 is a unique marketplace in the recruiting agency industry for…

πŸ“ San FranciscoπŸ“… 2017

AdvanoYC

active

Advano is a battery technology company that improve the longevity of…

πŸ“ New OrleansπŸ“… 2017

AecoreYC

active

Vertically integrated commercial construction

πŸ“ San JoseπŸ“… 2017

Decarbonized heat and power cheaper than fossil fuels

πŸ“ ParisπŸ“… 2017

And Comfort is a direct to consumer fashion brand.

πŸ“ San FranciscoπŸ“… 2017

The best way to build Voice AI apps

πŸ“ San FranciscoπŸ“… 2017

AudmYC

acquired

Audm is a subscription service providing mini-audiobooks —…

πŸ“ New YorkπŸ“… 2017

AutoHubYC

acquired

We help dealerships appraise vehicle trade-ins more efficiently…

πŸ“ San FranciscoπŸ“… 2017

The genetic testing platform detecting and measuring disease.

πŸ“ Menlo ParkπŸ“… 2016

The online coding school that invests in you.

πŸ“ San FranciscoπŸ“… 2017

BumplineYC

shutdown

Captain Tailor is the Uber for tailoring.

πŸ“ San FranciscoπŸ“… 2017

bxblueYC

acquired

bxblue is a marketplace for people with guaranteed income in Brazil.…

πŸ“ DFπŸ“… 2017

Caelum Health is replacing drugs with software. We use behavioral…

πŸ“ San FranciscoπŸ“… 2017

Your voice. Your health. We care.

πŸ“ SunnyvaleπŸ“… 2017

CCG.ai empowers clinicians to make personalised treatment strategies…

πŸ“ CambridgeπŸ“… 2017

The digital storefront for staffing and recruiting teams.

πŸ“ New YorkπŸ“… 2020

CarDashYC

acquired

Managed marketplace for automotive services.

πŸ“ Menlo ParkπŸ“… 2017

Customized fertility benefits for modern companies.

πŸ“ San FranciscoπŸ“… 2017

Next-gen digital payments provider for India.

πŸ“ BengaluruπŸ“… 2017

Marketplace for local activities.

πŸ“ New YorkπŸ“… 2017

First agentic AI-powered community for 1 billion people with criminal…

πŸ“ MiamiπŸ“… 2017

CovetlyYC

shutdown

#1 Collectibles Marketplace: Authentic Vinyl Toys, Comics, Funko Pop

πŸ“ New YorkπŸ“… 2017

D-IDYC

active

Enable creators and developers to generate realistic AI personas

πŸ“ Tel Aviv-YafoπŸ“… 2017

Early detection of Alzheimer's disease

πŸ“ San FranciscoπŸ“… 2017

The easiest way to buy 74k+ crypto tokens with USD

πŸ“ San FranciscoπŸ“… 2017

The Complete Listing Toolkit for the New Era of Real Estate

πŸ“ San FranciscoπŸ“… 2017

DropleafYC

shutdown

Subscription service for all you can play indie PC games.

πŸ“ SeattleπŸ“… 2017

EduflowYC

acquired

Create and run collaborative online learning experiences.

πŸ“ CopenhagenπŸ“… 2017

ElucdYC

acquired

Polling through mobile ads to enable governments to make better…

πŸ“ New YorkπŸ“… 2017

Automated factory to produce insect protein for farm animals.

πŸ“ LondonπŸ“… 2017

EnzymeYC

acquired

Automating regulatory approval & compliance for life science companies

πŸ“ San FranciscoπŸ“… 2017

The backend for Augmented Reality.

πŸ“ SunnyvaleπŸ“… 2017

FamYC

shutdown

Video calling social network to talk with friends and make new friends

πŸ“ New YorkπŸ“… 2017

FastpadYC

shutdown

Hiring Software for India

πŸ“ BengaluruπŸ“… 2017

Fat LlamaYC

acquired

Fat Llama is the first fully insured peer-to-peer rental marketplace.…

πŸ“ LondonπŸ“… 2017

FAZZYC

active

All-in-one Finance for Every Southeast Asia Business

πŸ“ JakartaπŸ“… 2017

FeatherYC

acquired

Furniture rental for consumers and businesses.

πŸ“ New YorkπŸ“… 2017

The first public safety operating system that eliminates crime.

πŸ“ AtlantaπŸ“… 2022

The operating system powering ecommerce fulfillment

πŸ“ Los AngelesπŸ“… 2017

Email-based personal assistant that sends reminders at specified times using simple email syntax.

πŸ“ San JoseπŸ“… 2017

We bank your stem cells to help you live healthier, longer.

πŸ“ Ann ArborπŸ“… 2017

GamedayYC

shutdown

Play fantasy sports with friends on Facebook Messenger

πŸ“ San FranciscoπŸ“… 2017

GamelynxYC

shutdown

Easily watchable cross-platform competitive games.

πŸ“ Santa MonicaπŸ“… 2017

GemYC

active

Talent engagement platform

πŸ“ San FranciscoπŸ“… 2017

Digital Co-op Renters Insurance = half the price, better coverage.

πŸ“ San FranciscoπŸ“… 2019

GoosebumpYC

shutdown

Find the best electronic music events in a single message.

πŸ“ ParisπŸ“… 2017

GreoYC

shutdown

Greo is a mobile video app for conversations about current events.

πŸ“ Palo AltoπŸ“… 2017

GuggyYC

shutdown

Guggy is building the messaging app of the future with real time,…

πŸ“ Tel Aviv-YafoπŸ“… 2017

GuildedYC

acquired

Chat for gaming communities

πŸ“ San FranciscoπŸ“… 2017

HeadstartYC

acquired

Headstart uses Machine Learning to help companies decide on who to…

πŸ“ LondonπŸ“… 2017

Africa's #1 healthcare technology provider.

πŸ“ LAπŸ“… 2017

No description available

πŸ“ TorontoπŸ“… 2017

HoneydueYC

acquired

The simplest way for couples to manage money, together

πŸ“ San FranciscoπŸ“… 2017

IndivioYC

acquired

Customize videos to be more relevant and improve business outcomes.

πŸ“ Redwood CityπŸ“… 2017

JerryYC

active

Jerry makes it really easy to save time and money on car expenses.

πŸ“ Palo AltoπŸ“… 2017

Just Appraised makes software for local governments.

πŸ“ Palo AltoπŸ“… 2017

Buying and owning indoor potted plants made easy.

πŸ“ Los AngelesπŸ“… 2017

LTSE is an ecosystem for visionary business.

πŸ“ San FranciscoπŸ“… 2017

LotusPayYC

acquired

Recurring payments solution for businesses in India.

πŸ“ BengaluruπŸ“… 2017

LyrebirdYC

acquired

Our tech speaks for itself.

πŸ“ MontrealπŸ“… 2017

Transforming cities and rural areas through AV transit and technology

πŸ“ Ann ArborπŸ“… 2017

Automated meeting scheduling for teams

πŸ“ San FranciscoπŸ“… 2017

At-home fertility test for women who aren't ready for kids right now…

πŸ“ San FranciscoπŸ“… 2017

We're making it easier to do sustainable farming.

πŸ“ San FranciscoπŸ“… 2017

MuzzYC

active

Where Single Muslims meet

πŸ“ LondonπŸ“… 2017

We help kids stay curious by creating better explanations.

πŸ“ San FranciscoπŸ“… 2017

MystroYC

shutdown

Mystro is an app that makes rideshare drivers up to 30% more money by…

πŸ“ San FranciscoπŸ“… 2017

NextDropYC

shutdown

NextDrop is the water marketplace for urban India. We connect water…

πŸ“ BengaluruπŸ“… 2017

NimbleYC

active

Data-driven teacher hiring

πŸ“ RemoteπŸ“… 2017

Cheese and dairy products from plant-derived dairy proteins

πŸ“ San FranciscoπŸ“… 2020

Building next generation tools for the hybrid workplace

πŸ“ LondonπŸ“… 2017

OncoboxYC

active

Finding the right cancer drug for each patient.

πŸ“ WalnutπŸ“… 2017

OneLocal is a CRM for local businesses.

πŸ“ TorontoπŸ“… 2017

OpearloYC

acquired

Opearlo produces voice apps for Amazon Alexa and Google Home.

πŸ“ LondonπŸ“… 2017

Passerine Aircraft is building the next generation of dronesWe are…

πŸ“ JohannesburgπŸ“… 2017

PathriseYC

shutdown

YC for your career

πŸ“ San FranciscoπŸ“… 2017

Percept.AIYC

acquired

AI support agent for your business that actually works

πŸ“ SunnyvaleπŸ“… 2017

PiggyYC

shutdown

App for Indians to make investments in mutual funds, manage their…

πŸ“ MHπŸ“… 2017

PlasticityYC

acquired

Natural language processing APIs for developers.

πŸ“ San FranciscoπŸ“… 2017

PollyYC

shutdown

Polly is a social polling app for Snapchat and Instagram stories.

πŸ“ San FranciscoπŸ“… 2017

Pop Meals is a restaurant chain without chefs. All recipes are…

πŸ“ Kuala LumpurπŸ“… 2017

Rapid, scalable diagnostic for SARS-CoV-2 and beyond

πŸ“ South San FranciscoπŸ“… 2017

PrelimYC

active

Software for banks to open bank accounts

πŸ“ San FranciscoπŸ“… 2017

Prism LabsYC

shutdown

No description available

πŸ“ San FranciscoπŸ“… 2017

Code review as a service - combining automation with a network of…

πŸ“ AustinπŸ“… 2017

PyYC

acquired

Py is democratizing access to career opportunities in tech

πŸ“ San FranciscoπŸ“… 2017

PykaYC

active

Autonomous electric airplanes

πŸ“ AlamedaπŸ“… 2017

RabbetYC

active

Bringing efficiency, accuracy and transparency to construction finance

πŸ“ AustinπŸ“… 2017

Dating & relationship coaching sessions for individuals and couples

πŸ“ San FranciscoπŸ“… 2017

Turning food waste into Biochar to remove CO2 from the atmsophere

πŸ“ LagosπŸ“… 2017

Rev is a biotechnology company creating better plants.

πŸ“ OaklandπŸ“… 2017

Health enterprise API for data on doctors, insurance, costs, & quality

πŸ“ New YorkπŸ“… 2017

RideAlongYC

shutdown

We save lives by giving police and health workers key info to safely…

πŸ“ San FranciscoπŸ“… 2020

RoofrYC

active

Sales software for roofers. Aerial measurements + proposals in seconds

πŸ“ San FranciscoπŸ“… 2017

Simplifying payouts at scale

πŸ“ San FranciscoπŸ“… 2017

Your chief servant for shopping insurance

πŸ“ Palo AltoπŸ“… 2017

SemantixYC

shutdown

AI for medical billing

πŸ“ San FranciscoπŸ“… 2020

SixtyYC

shutdown

On demand web app help

πŸ“ San FranciscoπŸ“… 2017

Skyscrape makes temperature-responsive insulation

πŸ“ PortlandπŸ“… 2017

SkywaysYC

active

Creating a new form of air transportation to advance our civilization

πŸ“ AustinπŸ“… 2017

SlikYC

shutdown

Slik enables the long tail to use email outreach.

πŸ“ San FranciscoπŸ“… 2017

Social Construct designs and assembles large apartment buildings
…

πŸ“ San FranciscoπŸ“… 2017

SolveYC

acquired

We save travelers hours by meeting them at their arrival gate,…

πŸ“ Las VegasπŸ“… 2017

No description available

πŸ“ San FranciscoπŸ“… 2017

SpectYC

shutdown

Value-based retinal screening in primary care to prevent blindness.

πŸ“ Palo AltoπŸ“… 2023

AI-powered checkout for retail.

πŸ“ San FranciscoπŸ“… 2017

StoryboardYC

shutdown

Social media management tool for Instagram and Snapchat

πŸ“ San FranciscoπŸ“… 2020

SunfoldingYC

shutdown

Sunfolding builds next generation infrastructure for solar farms. By…

πŸ“ San FranciscoπŸ“… 2017

SunuYC

shutdown

Audio and Haptics AR interface equipping blind users with super powers

πŸ“ ZapopanπŸ“… 2020

SurematicsYC

acquired

Platform to help commercial insurance brokers structure complicated deals online using blockchain technology.

TemplarbitYC

acquired

Protecting applications from malicious activity

πŸ“ San FranciscoπŸ“… 2017

Tesseract builds better thrusters for modern satellites

πŸ“ LivermoreπŸ“… 2017

AI-powered platform that analyzes unstructured customer feedback from multiple channels to uncover actionable insights and improve customer experience.

πŸ“ AucklandπŸ“… 2015

No description available

πŸ“ Los AngelesπŸ“… 2020

tpagaYC

active

First financial Superapp of Latin America

πŸ“ BogotΓ‘πŸ“… 2017

TruepillYC

acquired

API-connected healthcare infrastructure.

πŸ“ San MateoπŸ“… 2017

UpCodesYC

active

AI platform for unifying codes, assemblies, products, and specs

πŸ“ AustinπŸ“… 2017

UpfortYC

active

Turnkey security & hassle-free cyber insurance from leading insurers

πŸ“ San FranciscoπŸ“… 2017

Platform to defeat political extremism through strategic primary…

πŸ“ UnknownπŸ“… 2017

AI-Powered Building Management

πŸ“ San FranciscoπŸ“… 2017

VIDA & Co.YC

acquired

Platform for unique products produced on-demand at mass-scale

πŸ“ San FranciscoπŸ“… 2017

WATERFXYC

shutdown

The world's first 100% sustainable water provider (aka alternative…

πŸ“ CAπŸ“… 2017

WheelStreet is a Motorbike rental marketplace that connects…

πŸ“ BengaluruπŸ“… 2017

WildfireYC

acquired

Social news app

πŸ“ San FranciscoπŸ“… 2017

ZendarYC

active

We make high definition radar allowing self-driving cars to see in…

πŸ“ BerkeleyπŸ“… 2017