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YC S18 100 startups

YC S18 Startups

Every Y Combinator Summer 2018 company we currently index.

Last updated

2026-07-17

Hiring right now 5% 5 of 100

Open roles 45

Most-hired discipline Engineering

The Y Combinator S18 batch (Summer 2018) brought 100 tech startups into our index. This page lists every S18 company we currently track, with logos, taglines, and links straight to their own sites — no paywalled middleman. Notable S18 companies include RevenueCat, 64x Bio, Activeloop, Aesthetic, and Ajaib. Each profile surfaces team size, founding year, location, and open roles when their careers page is publicly scrapable. The S18 cohort skews toward Healthcare, Dev Tools, and Fintech — common patterns we see in this batch. Recurring tags across these companies: SaaS, Fintech, Artificial Intelligence, AI, Biotech. The directory's filter UI accepts any of them as a query. Geographically, the S18 batch we have leans toward San Francisco, New York, and New York City, with the rest spread across remote-first teams and other hubs. 1 of these is currently flagged as trending based on momentum signals; and the listing refreshes whenever the scrape runs, so changes propagate without a manual edit.

A simple API for managing in-app subscriptions

Developer ToolsSubscriptions

Enabling next generation medicines. A comprehensive platform and…

Gene TherapyMachine Learning

Database for AI

Computational StorageDeep LearningGenerative AI

Your AI-powered creative apprentice 🪄

Consumer fintech for Indonesia

FintechConsumer

Allotrope Medical

Advancing surgical precision through safe electrical stimulation.

HardwareRobotic SurgeryMedical Devices

Developer-friendly and enterprise-grade APIs for financial market…

Developer ToolsSaaSAnalytics

Design to Code & On-brand Vibe-coding

Artificial IntelligenceDeveloper ToolsSaaS

Connecting Survivors to Careers in Tech

Assistive TechSaaSCivic Tech

Apprentice Health

We deploy sensors and software that increase hospital efficiency.

AskMyClass, now Soundkins

Audio learning assistant for teachers and students.

AI-Enhanced LearningEducation

Convert more verified users. Instantly & accurately validate user IDs.

The automated solution for complex freight transactions.

LogisticsSupply Chain

AI Clinical Assistant for Doctors

Automated receptionist that answers missed calls for local businesses

Artificial IntelligenceSaaS

C16 Biosciences

Next-gen ingredients to decarbonize consumer products, starting w/…

BiotechSustainabilityClimate

Full-stack grocery delivery in LatAm

GroceryMarketplaceLogistics

Canary Technologies

Modernizing the hospitality tech stack.

CB Therapeutics

Fermentation-derived natural products to solve health problems

Cellular AgricultureBiotech

Utilizing monogenic disorders to inform and solve highly complex…

NeurotechnologyBiotechGenomics

Our tests help eradicate cancer by telling doctors whether they got…

HealthcareDiagnosticsWomen's Health

Research and analytics company focused on college students.

EducationAnalytics

New clinical tests for managing autoimmune treatments.

Corvus Robotics

Autonomous drones to help warehouses scan inventory.

Warehouse Management TechRoboticsDrones

Digitizing wealth management in Africa

The Computer Science Proficiency Assessment (CSPA™) is a…

EducationRecruiting

We build cities for people, not cars.

Real EstateHousingProptech

Modern, AI-powered clinical trial software platform.

Data Driven Bioscience

Cancer Diagnosis 10X faster, 10X cheaper

Artificial IntelligenceBiotechHealthcare

Now part of thentwrk.com

MediaAdvertising

We crowdsource food safety reports & detect and prevent outbreaks.

Dorian Therapeutics

New therapeutics to rejuvenate tissue and treat age-related diseases

Anti-AgingBiotechTherapeutics

DreamCraft Entertainment, Inc.

Platform that allows anyone to create and monetize video games.

Developer ToolsEntertainmentGaming

The complete toolkit to sell travel.

AirplanesB2BTravel

Shopify for experiences

SaaSTravelE-commerce

Developing AI to unleash diagnostic abundance.

Digital HealthHealthcare

The funnel builder built for health & wellness brands.

We verify global supply chains for issues like child slavery and…

SustainabilitySupply Chain

Penetration testing and bug bounty platform.

Robots that feed the world - robotic harvesting and analytics

RoboticsAnalyticsAgriculture

Mobility and payments platform for Latin America

PaymentsLatin AmericaMobility

Virtual Lab Managers for scientists and biotech, research Labs

Assistive TechSmart Home AssistantsWarehouse Management Tech

Helicarrier (prev Buycoins)

Cryptocurrency infrastructure for Africa.

Replacing organ transplant with an infusion

HeyDoctor provides online primary care (like refilling birth control,…

TelehealthDigital HealthPrimary Care

Honeylove makes functional undergarments for women

A tech-enabled commercial mortgage broker. hypcloud allows property…

FintechReal Estate

Powering the Future of Lab Operations with AIoT!

SaaSIoTProductivity

Impactive (formerly Outvote)

Political/civic tech helping progressive campaigns organize & mobilize

Election TechCivic TechGovTech

AI Document Fraud Detection for Banks, Credit Unions & Lenders

Artificial IntelligenceFintechFraud Detection

Automatic circuit board design.

Manage your ledgers and avail Financial Services like Lending on your…

Powering the $648b Care Economy

FintechMarketplace

Company Brain for people and agents to work in harmony.

Artificial IntelligenceEnterpriseAI

Kunduz provides instant answers to students' questions and makes…

AI-Enhanced LearningArtificial IntelligenceEducation

We at Leena AI build a virtual assistant that answers employee's…

Artificial IntelligenceGenerative AIChatbot

AI-generated personalized nutrition solutions, built for you daily.

Generative AIHealth TechHealth & Wellness

Capture, create, & share gaming moments (Acquired by Niantic!)

Mark Cuban Cost Plus Drug Company, PBC

Making low cost versions of high cost generic drugs.

Group-Therapy Platform for Providers and Health Systems

Mental Health TechConsumer Health Services

An online provider for greater mental health

Mental Health TechDigital HealthHealthcare

Modern Treasury

Payment operations tools for money movement.

The space infrastructure services company

Commercial Space LaunchSolar PowerSpace Exploration

Your AI agent for creating anything customer-facing, in minutes.

Artificial IntelligenceSaaSB2B

Robotic human cell manufacturing

HardwareIoTBiotech

Technology to create fast, visual indexes of people and organizations.

Skills-based talent management solutions for a dynamic workforce.

Digital subscriptions that delight investors.

Simple and secure bookkeeping for Indian businesses.

FinOpsFintechPayments

GraphQL API to connect all of the internet's APIs. Join us at Netlify!

We help retailers and restaurant chains manage repairs and…

Making APIs Developer-friendly

Developer ToolsOpen Source

Manage capital, investors & banking in one place.

Artificial IntelligenceBanking as a ServiceFintech

A leading digital bank in the US offering personal and business…

We deploy autonomous drones to 911 calls. Our software gives first…

SaaSDronesGovTech

One-stop-shop for flexible family care

Consumer Health ServicesDigital Health

We are developing a revolutionary AI-powered augmented reality…

Artificial IntelligenceMachine LearningAugmented Reality

Pine Park Health

We provide primary care in senior living communities.

Our platform enables creators to build experiences, games, and worlds…

Lending Intelligence Software

FintechSaaSConsumer Finance

Conversation Design platform to build Al Assistants tailored to your…

Artificial IntelligenceChatbotConversational AI

Quo (fka OpenPhone)

The all-in-one business phone for teams.

Rain Neuromorphics

We build artificial intelligence processors inspired by the brain.

Artificial IntelligenceHardwareNeurotechnology

Rebellyous Foods

Rebellyous Foods is a food manufacturing technology and production…

ClimatePlant-based Meat

AI Agents for Regulatory Compliance

LegalLegalTechRegtech

Rejuvenation Technologies Inc.

mRNA therapeutics to extend healthspan entering clinical trials

Anti-AgingGene TherapyNanomedicine

Scanwell Health

Smartphone-enabled, at-home diagnostics

Health TechDiagnostics

Transforms how grocery stores buy highly perishable foods.

Machine Learning

Logistic Management System for E-commerce & Retail in Mexico.

MarketplaceSaaSLogistics

Trends prediction for marketers

Machine LearningAI

Synkrino Biotherapeutics

Synkrino's AI, SATIS is a powerful, unbiased discovery system for…

AI-powered Drug DiscoveryBiotech

Protecting your employees against online harassment

SecurityHR Tech

AI Platform for Efficient and Sustainable Operations

ConstructionLogisticsEnergy

The Good Food Institute

Building a world where alternative proteins are no longer alternative.

ClimatePlant-based MeatCultivated Meat

Titan is an award-winning wealth manager with a mission to increase…

Learning Hub for companies in Latam

EducationSaaSeLearning

Software platform for in-home healthcare

Consumer Health ServicesMedical Devices

The world's fastest calendar, beautifully designed for remote teams.

SaaSProductivityScheduling

ZiffyHomes is managed corporate housing for white collar employees in…

Real EstateIndia

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Frequently asked questions

What is the YC S18 batch?

S18 is the Y Combinator batch code for the Summer 2018 cohort. Companies joining a YC batch go through a 3-month program in California and demo their product at the end. techstartupslist.com indexes 100 tech startups from this batch.

How many companies are in YC S18?

Our index currently tracks 100 active tech startups from the YC S18 batch. New companies appear here automatically when our daily scraper finds them; companies that shut down are flagged inactive and hidden from listings.

Which companies graduated from YC S18?

Among the S18 companies indexed here: RevenueCat, 64x Bio, and Activeloop, and 97 more on this page. Click any profile for category, team size, founding year, and open roles.

Where can I find open jobs at YC S18 startups?

Open roles from indexed S18 companies appear on our /jobs page, aggregated alongside roles from other indexed startups. Each role links directly to the company's official application page.

How often is the YC S18 page updated?

Automated scrapers refresh this page daily. The last index update was 2026-07-17. Inactive companies fall out of the count automatically — we don't keep dead listings live.