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YC W21 276 startups

YC W21 Startups

Every Y Combinator Winter 2021 company we currently index.

Last updated

2026-07-17

Hiring right now 5% 14 of 276

Open roles 160

Most-hired discipline Engineering

The Y Combinator W21 batch (Winter 2021) brought 276 tech startups into our index. This page lists every W21 company we currently track, with logos, taglines, and links straight to their own sites — no paywalled middleman. Notable W21 companies include Gigs, Ollama, Phoenix, Vapi, and Abacum. Each profile surfaces team size, founding year, location, and open roles when their careers page is publicly scrapable. The W21 cohort skews toward Dev Tools, AI / ML, and Fintech — common patterns we see in this batch. Recurring tags across these companies: SaaS, B2B, Fintech, Artificial Intelligence, Developer Tools. The directory's filter UI accepts any of them as a query. Geographically, the W21 batch we have leans toward San Francisco, New York, and Bengaluru, with the rest spread across remote-first teams and other hubs. 4 of these are currently flagged as trending based on momentum signals; and the listing refreshes whenever the scrape runs, so changes propagate without a manual edit.

The OS for Embedded Telecom

FintechHR TechAPI

Get up and running with large language models.

Artificial IntelligenceDeveloper ToolsOpen Source

Canada's digital health clinic for men

Consumer Health ServicesTelehealthConsumer

Voice AI for developers.

Artificial Intelligence

The AI-native FP&A platform that helps Finance teams drive business…

Shopify for Beauty and Wellness businesses in Latam

We make satellites to image everywhere on Earth, every 15 minutes

Hard TechSatellites

Full-stack VLEO satellite missions

Hard TechSatellitesClimate

Automated investing for the next generation 💸

Artificial IntelligenceEducationFintech

Frontend Platform for eCommerce

Developer ToolsOpen SourceE-commerce

Software for procurement departments to find suppliers 10x faster

Supply ChainProcurement

The next generation care enablement platform

Deep LearningSaaSConsumer Health Services

AI workers for the logistics industry.

Artificial IntelligenceGenerative AIB2B

Recover from any outage in 10 minutes or less.

Cloud Workload ProtectionSaaSB2B

Atomic Industries

Software orchestrated mass production of plastics

Artificial IntelligenceHard TechManufacturing

Enabling consumers split the cost of purchases without a credit card

FintechPaymentsConsumer Finance

Providing clean, safe, virus free air for homes, buildings and cars

Neurostimulation implant to restore hearing & speech understanding

Hard TechNeurotechnologyHealth Tech

Stripe for online identity verification

Authorization Infrastructure securing AI at OpenAI, Zoom, & more

Artificial IntelligenceDeveloper ToolsSecurity

Observability platform for operations teams

Developer ToolsSaaSData Engineering

Aviron Interactive

Aviron transforms workouts with game-based exercise machines, making…

Sports TechConsumer Health ServicesGaming

AI-Native Restaurant POS

FintechGenerative AIRestaurant Tech

Reinventing lifelong learning for the future of work.

EducationeLearning

Multi-agent orchestration platform

Artificial IntelligenceDeveloper ToolsB2B

No-code Browser RPA

Robotic Process AutomationSaaS

Scheduling and workforce management SaaS for home healthcare providers

SchedulingLogisticsHealthcare

Improving Developer Experience with Streamlined Code Reviews

Developer ToolsSaaS

India’s first and only marriage super app

Affordable insurance for the next billion Indians

FintechMicroinsurance

Cloud AI microscopy automation

Artificial IntelligenceDeep LearningSaaS

Investing app that teaches you how to invest

EducationFintechEdtech

Analytics, built for the trades.

SaaSB2BAnalytics

We use robots to build houses.

Robotic Process AutomationRoboticsConstruction

All-in-one HR management platform for SMEs

SaaSHuman ResourcesB2B

At-home oral health testing, coaching & care

Consumer Health ServicesTelemedicine

The multicurrency account and card for Brazilians

Building Chime for India

FintechIndiaNeobank

Automated user acquisition & selling on WhatsApp for businesses

Artificial IntelligenceSaaSE-commerce

Admin automation for healthcare

Mental Health TechHealth Tech

The super app for pets

MarketplaceVideo

A Nouns DAO governance client

GovTechCrypto / Web3Infrastructure

The highest-accuracy global weather data from low-cost flat satellites

Hard TechSpace ExplorationSatellites

Ramp for Indian Businesses - UPI Wallets for Employee Expenses

The modern, open source, self-hosted AI customer support platform

B2BCustomer SuccessOpen Source

Mobile app and coaching program that helps employees sleep better

Mental Health TechSleep TechHealth Tech

The unbiased AI and data layer for skin health.

MarketplaceConsumerDigital Health

Amazon-like logistics for e-commerce companies in Latam

Warehouse Management TechB2BLogistics

Turn regular mobile photos into professional product visuals

SaaSComputer VisionDesign Tools

AI-powered customer service for startups

Artificial IntelligenceSaaSChatbot

Effective and accessible online live education.

EducationeLearningCommunity

Leading online after-school for kids & teens to learn AI & coding

EducationeLearningEdtech

Cut your writing time by 40% with AI-powered autocomplete

Artificial IntelligenceNLPEmail

Communication and publishing tools for scientists

DocumentsDeveloper ToolsSaaS

Cyble - World’s First Intelligence-Driven, AI-Native Security…

Bring Justice to Light

Software for medical laboratories and clinics

Health TechB2BDigital Health

Generative AI Healthcare Coding Automation

B2BAnalyticsHealthcare

Data-driven embedded Financial Services for Gig Workers

Banking as a ServiceFintech

Challenger Bank for consumers in French speaking Africa.

DreamWorld is a next-gen Minecraft with generative AI building

Real-time audio & video SDKs, ready to launch 🚀

VideoAPITelecommunications

Supercharge your mobile apps

Artificial IntelligenceDeveloper ToolsB2B

Digital Sales Rooms (Acquired by MindTickle)

Artificial IntelligenceSaaSB2B

The data layer for physical AI

Machine LearningRoboticsEnterprise Software

An API for electric vehicles and other energy hardware (DERs)

ClimateAPIElectric Vehicles

Entelexo Biotherapeutics

Creating a New Class of Drugs to Address Incurable Autoimmune Diseases

Turning HR data into actionable insights

SaaSHuman ResourcesB2B

The Logistics Operating System for E-commerce in LatAm

B2BLogisticsE-commerce

Procure the right software 5x faster

Machine LearningSaaSB2B

The most flexible AI meeting notetaker ever built.

SaaSB2BProductivity

Feroot Security

AI-powered Compliance Platform for PCI 4, CCPA, HIPAA, CIPA, 50+ laws

ComplianceSecurityPrivacy

Continuous Documentation To End Documentation Rot

DocumentsDeveloper Tools

The new wealth manager for Europe

FintechInvestingNeobank

Streamline your debt capital raise and management

FintechSaaSEnterprise

Account-to-Account payments in Mexico and Chile.

Developer ToolsFintechSaaS

The all-in-one startup operating system

SaaSB2BLegalTech

FirstSupport.ai

AI Assistant for Customer Support

Artificial IntelligenceSaaSB2B

The one-stop shop for healthy products

GroceryE-commerce

Tech-enabled fulfillment provider in the Middle East & Africa

LogisticsSupply Chain

End to end company retreat planning

MarketplaceTravelRemote

No-code workflow tool

B2BCustomer SuccessCompliance

Application Development Platform (Native Mobile + Web Apps)

Cross border Payments infrastructure for internet businesses and…

DeFiCrypto / Web3

Physical AI for Warehouses and Factories

Artificial IntelligenceAutonomous TruckingHard Tech

A better way to write.

Helping food brands and retailers reduce food wastage

Artificial IntelligenceWarehouse Management TechE-commerce

The place where motivated investors and entrepreneurs co-own together.

FintechReal EstateCommunity

AI Social Media Manager

Developer ToolsSaaSDesign Tools

FunctionUp (FanPlay)

A skill-tech platform that runs placement bootcamps

EducationIncome Share AgreementseLearning

Digital e-prescribing software for veterinarians.

all-in-one operating system (OS) for telcos

IoTMobilityTelecommunications

Gerald Technologies, Inc

Buy Now Pay Later + Cash Advance for Household Essentials

FintechPaymentsConsumer

GimBooks makes Bookkeeping Easy for small business owners

How great teams ship with AI

Developer ToolsB2BAI

Integrated, high touch healthcare — at scale

Consumer Health ServicesHealth TechTelehealth

GreaseBoss verifes industrial machinery is greased correctly

User research on autopilot.

SaaSB2BDesign Tools

The Operating System for Maritime

Hard TechSaaSMaritime

Protecting the grid today, preparing the grid for tomorrow

HardwareClimateEnergy

App for independent agents to sell financial products in India

FintechInsurance

H3X Technologies

The lightest electric aircraft motors in the world.

AirplanesClimateElectric Vehicles

Stocks and cryptos trading app with zero commissions and no minimums…

FintechFinanceConsumer Finance

Delivery Analytics for Software Teams

Hermes Robotics

Autonomous street sweeping as a service by retro-fitting vehicles

Autonomous TruckingHard TechRobotics

Personalized rent-to-own real estate financing using technology in SEA

FintechProptech

Code review for DevOps tasks

Developer ToolsDevSecOps

All-in-one real estate marketplace for Latin America

MarketplaceProptech

We help US tech companies hire and manage software engineers in LATAM

Global Card Issuing and Payment Processing Engine

FintechPaymentsB2B

The Most-Loved IT Documentation Platform

SaaSB2BWorkflow Automation

AI-Powered HRIS for high performing teams

SaaSHuman ResourcesB2B

AI that keeps complex construction projects on schedule.

ConstructionB2BScheduling

Business intelligence on text

Machine LearningB2BNLP

Electricity price forecasts for energy storage, ev charging, etc.

Energy StorageSaaSClimate

$Infracost$

Shift FinOps Left: Proactively Find & Fix Cloud Cost Issues

Developer ToolsDevSecOpsFinOps

We provide a curated, evidence- based answer to any clinical question.

Artificial IntelligenceB2BTelemedicine

Collaborative ticketing that integrates into Teams and Slack

Source better parts by partnering directly with vetted manufacturers

B2BManufacturingSupply Chain

No code platform for sales to tell better stories and win more deals.

Juicy marbles makes thick juicy and marbled plant based steaks.

ClimateClimateTech

Affirm for general contractors

FintechSaaSProptech

Online school for K12 education in Africa

EducationeLearning

Desktop DNA Printer. The Nespresso Machine for DNA.

Hard TechHardwareMedical Devices

A faster and more collaborative alternative to Jira for remote teams

Developer ToolsProductivityTeam Collaboration

Create & sell online courses

Corporate card & spend management platform for Indian startups

Rocket Mortgage for LatAm.

FintechLatin AmericaLending

Take Care of Shitty Paperwork for Expensive Drugs

Open source mobile marketing platform. Alternative to appcues /…

SaaSB2BOpen Source

Embedded lending infrastructure for software companies

Realistic virtual video studio to record and stream from your browser

Augmented RealityComputer VisionDesign Tools

Clinical skincare tested on diverse skin, now available in Sephora.

ConsumerHealthcareBeauty

The Unified AI-ERP & FP&A Platform

Visual, collaborative financial modeling software

FinOpsFintechSaaS

World's fastest and most optimal route optimization engine

SaaSDeliveryLogistics

Building New Anti-Aging Ingredients for Skincare

Anti-AgingBeauty

Marketplace for construction machines

MarketplaceConstruction

The notification inbox for web/mobile applications.

Developer ToolsSaaS

Connecting top Middle East talent to global tech jobs

EducationEdtech

A growth automation platform for Amazon sellers

SaaSAnalyticsE-commerce

Telemedicine platform for chronic conditions like obesity

Consumer Health ServicesE-commerceSubscriptions

Software for pharmacies to move beyond dispensing

SaaSB2BDigital Health

Workflows to empower employees to spend while finance stay in control

The one-stop-shop for auto-parts in Mexico.

FintechMarketplace

AI Document Understanding API

Artificial IntelligenceDeep LearningDeveloper Tools

ModernLoop helps teams automate and streamline recruiting operations

B2BRecruitingProductivity

AI Powered Animal Diagnostics

Plaid for Africa, but better.

Building the next generation AI creative studio

We underwrite and insure house rentals in Latam

Real EstateInsuranceLatin America

Dermatology telehealth app for LatAm

Consumer Health ServicesTelemedicine

Low latency API to run and deploy ML models

AIOpsArtificial IntelligenceDeveloper Tools

Nano Technologies

Payroll app to pay workers daily for retailers & manufacturers in SEA

Interactive product demos

The digital bank for small businesses in the Philippines.

Banking as a ServiceFintechB2B

The lifestyle medicine layer for clinicians.

Digital HealthHealthcareHealth & Wellness

Telehealth dietitians covered by insurance

Consumer Health ServicesHealthcare

Nuntius Therapeutics

Cell-specific genetic medicines

Gene TherapyNanomedicine

Buy Now Pay Later for Southeast Asia

Restaurant Solution (E-commerce via WhatsApp + POS + CRM/Marketing)

SaaSB2BFood Tech

Simplifying hiring and payments for the global workforce

The open source AI coding agent

Developer ToolsOpen Source

Tasty and scalable cultivated meat at price parity

Cultured MeatClimateFood Tech

AI that expands any video to fit any screen.

VideoMediaInfrastructure

Pay, Get Paid and Extend Cash Flow using your Credit Card as…

FintechPayments

Hire Fractional Marketing + Design Talent

MarketplaceRecruitingAI Assistant

AI to track and analyze public policy

Artificial IntelligenceMonitoringAI

The network where sales teams connect to share customer introductions.

Employer backed payroll advances for employees in Egypt

RecruitingHR Tech

The AI operating system for restaurants

PaymentsConsumerB2B

Pesto — Fintech

The fastest path from submission to better decisions.

Artificial IntelligenceGenerative AIB2B

Video messaging app for remote teams.

PipeBio is a SaaS bioinformatics platform to develop antibody drugs.

AI-powered Drug DiscoveryMachine LearningSaaS

The online language school for Latam, with groups led by an instructor

EducationeLearning

Your AI GTM platform for event lead capture

Artificial IntelligenceSaaSB2B

PowerRouter helps sales teams with lead routing in Salesforce

Pragmatic Leaders (Ankai Inc)

AI-powered Corporate Training: Faster, Smarter, and More Effective

Artificial IntelligenceSaaSeLearning

Shopify for LatAm

SaaSB2BE-commerce

Helping B2B co's sync data to their customers

SaaSAnalyticsData Engineering

Self-service RFP management

FintechSaaSProcurement

Dramatically better search and ads for marketplaces

Machine LearningMarketplaceB2B

Banking for businesses

Finance for Founders

Open source continuous profiling software to debug performance issues

Developer ToolsSaaSOpen Source

Quadrant Health

Analyzing EHR and messaging data to predict disease before it occurs.

SaaSHealthcare ITAI

Tools & infra to build and scale high-quality blockchain applications.

Developer ToolsSaaSCrypto / Web3

Equity management platform for startups and investors.

Embedded lending infrastructure

Reclaim Protocol

Education, Employment, Loyalty verification. Global & Compliant.

Artificial IntelligenceIdentity

Government-funded online addiction treatment

Redcliffe Lifetech

Redcliffe Labs is India's Largest Omni-channel Diagnostics platform

Consumer Health ServicesHealth TechDigital Health

All-electric seagliders for fast, affordable regional transportation

ClimateElectric VehiclesAerospace

AI-powered healthcare information

Artificial IntelligenceAI

Carbon capture for vehicles

Hard TechClimateClimateTech

Reshape Biotech

Robots that automate the everyday tasks of microbiologists.

RoboticsBiotech

Marketing automation platform for selling to local businesses.

LinkedIn content consultancy and scheduling platform for busy founders

B2BSocial MediaMarketing

Software to run car washes moving to a monthly subscription model

Artificial IntelligenceB2BE-commerce

AI Native Sales Outreach Platform

The Best Way to Sign Contracts Since Handshakes. Roger that.

DocumentsSaaSB2B

Roin Technologies

Building robots to automate commercial concrete construction.

Hard TechHardwareRobotics

AI-native all-in-one workspace for startups

Artificial IntelligenceProductivityCollaboration

Add powerful decision-making capabilities to any automated workflow.

Developer ToolsSaaSB2B

Easier and more reliable mobile app releases for teams.

Sell beyond the store.

Build better computer vision models by building better datasets

Deep LearningDeveloper ToolsComputer Vision

Fulfillment by Amazon for African merchants

LogisticsE-commerce

Genetic Medicine with Small Molecules

BiotechDrug discovery

Modernizing commercial insurance

ConstructionInsuranceEnergy

Open source alternative to DataDog

Developer ToolsSaaSB2B

Helping a billion people build their dream career

Generative AIMachine LearningMarketplace

Debt as a service for companies to lend money to their users at scale.

Artificial IntelligenceFintech

Chrome extension to turn clicks & keystrokes into no-code automations

No-codeAutomation

We help people resolve debt.

FintechConsumerLegalTech

Internet for the urban developing world.

Latin AmericaTelecommunications

AI tax workflow platform for accounting firms

AI-Enhanced LearningRobotic Process AutomationSaaS

Design and collaborate in multiple dimensions.

Artificial IntelligenceDesign ToolsAR

AI-powered video platform for Internal Comms and HR teams

eLearningB2BCulture

SpruceID lets users control their data across the web.

GovTechCrypto / Web3Identity

For whatever you build.

Developer ToolsOpen Source

Automated Answers to Security Questionnaires

ComplianceCybersecurity

Operating System for Hotels and Vacation Rentals

Seamless mobility to, through, and from space. It starts with 100%…

Space ExplorationSatellites

Compliant Crypto and Banking Infrastructure

Crypto / Web3Compliance

AI workers for logistics operations

Artificial IntelligenceLogisticsConversational AI

Enterprise ready webhooks service, open-source and in the cloud

Developer ToolsOpen SourceAPI

Healthy organic food that creates a positive impact

GroceryConsumerClimate

Management and analytics software for convenience stores

Better, faster tech vendor research

Developer ToolsSaaS

The financial layer for decentralized AI

Artificial IntelligenceDeFi

MIS on mobile for SMB's in India

Online therapy platform for the Spanish-speaking market

Mental Health TechConsumer Health ServicesTelemedicine

API for developers and AIs to access health data

SaaSB2BDigital Health

Slash commands anywhere

Robotic Process AutomationSaaSB2B

The Third Place

Subscriptions for neighborhood businesses

SaaSCommunitySubscriptions

Bringing the joy of cycling to millions of Indians

HardwareConsumerFitness

Makes it easy for tech platforms to embed insurance into products

Artificial IntelligenceDeveloper ToolsFintech

FintechReal EstateProptech

Generative AI powered Shopify for home service professionals

Physical AI for asset-heavy industries

Software and AI tools for SMBs in the US and Latin America

Artificial IntelligenceSubscriptions

Your one-stop shop to eat well in Brazil

GroceryMarketplace

Discover trends as they happen

AnalyticsSocial MediaMusic

Trestle Biotherapeutics

Bioengineered kidneys for patients with kidney failure

AI Agents for Oncology EHRs

HealthcareHealthcare IT

AI that expands any video to fit any screen.

VideoMediaInfrastructure

Marketplace for small business M&A

FintechMarketplace

AI-driven online tech school for busy professionals

We're Khatabook / OkCredit for Pakistan

No-code platform for enterprise software companies

Developer ToolsSaaSB2B

Learn, Intern and become Industry-Ready

EducationeLearning

AI-led market research interviews, no scheduling, instant insights.

B2BFeedbackMarket Research

Connecting low-income HS students with free, 24/7 online tutoring

EducationNonprofit

Valink Therapeutics

Discovering bispecific antibody drug-conjugates (BsADC) against cancer

BiotechTherapeuticsDrug discovery

We treat women with Polycystic Ovary Syndrome in India

Consumer Health ServicesFemtech

Where restaurants in Africa buy food supplies

Supply ChainFood & Beverage

Meet qualified leads in person by automating conference production

Artificial IntelligenceB2BCommunity

Better Business Insurance for MSMEs in India

GitHub for lawyers

Artificial IntelligenceSaaSB2B

Making Restaurants more data-driven!

Configuration language for building enterprise web apps 10x faster

Developer ToolsOpen Source

Track AI-generated code from commit to production

AIOpsArtificial IntelligenceAnalytics

The email API built for product teams

Open-source framework for building serverless applications

Developer ToolsB2BOpen Source

AI recruiter that runs outbound sourcing campaigns to find top talent

WeWeb is a no-code front-end builder that connects with any back-end.

Developer ToolsWeb Development

Manage your hybrid workplace

Life's better without allergies

Consumer Health ServicesConsumerDigital Health

Digital bank for teenagers in LatAm connected to prepaid card

FintechPaymentsConsumer

Software for remote monitoring of cancer patients

Health TechRemoteOncology

10-Minute Grocery Delivery in India

GroceryDelivery

A digital wallet for the Middle East & North Africa

FintechPaymentsNeobank

Platform for bus travel across Indian cities

MarketplaceTravel

Better Business on WhatsApp

Generative AISaaSE-commerce

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Frequently asked questions

What is the YC W21 batch?

W21 is the Y Combinator batch code for the Winter 2021 cohort. Companies joining a YC batch go through a 3-month program in California and demo their product at the end. techstartupslist.com indexes 276 tech startups from this batch.

How many companies are in YC W21?

Our index currently tracks 276 active tech startups from the YC W21 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 W21?

Among the W21 companies indexed here: Gigs, Ollama, and Phoenix, and 273 more on this page. Click any profile for category, team size, founding year, and open roles.

Where can I find open jobs at YC W21 startups?

Open roles from indexed W21 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 W21 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.