What they do:
Software for remote monitoring of cancer patients
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Y Combinator Winter 2021 Startups
This list has 335 startups and was last updated on Oct 15, 2026. 77 of them are hiring right now. Biggest hubs: San Francisco (85), New York (45), and Bengaluru (17). Largest teams: Redcliffe Lifetech, Zepto, and Tractian.
335 startupsPage 7 of 10
What they do:
Collaborative ticketing that integrates into Teams and Slack
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What they do:
Improving Developer Experience with Streamlined Code Reviews
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What they do:
Configuration language for building enterprise web apps 10x faster
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HQ: Zagreb, Croatia
What they do:
Cell-specific genetic medicines
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HQ: London, United Kingdom
What they do:
The unbiased AI and data layer for skin health.
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HQ: London, United Kingdom
What they do:
Building New Anti-Aging Ingredients for Skincare
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HQ: San Francisco, CA, United States
What they do:
Multi-agent AI for physical logistics operations
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HQ: San Francisco, CA, United States
What they do:
The email API built for product teams
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HQ: United States
What they do:
Get up and running with large language models.
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HQ: San Francisco, CA, United States
YC W21Growth stage
Pesto
Hiring
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HQ: San Francisco, CA, United States
R2
Acquired
What they do:
Embedded lending infrastructure
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HQ: Mexico City, Mexico
Fathom
Acquired
What they do:
The most flexible AI meeting notetaker ever built.
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HQ: San Francisco, CA, United States
Verak
Acquired
What they do:
Better Business Insurance for MSMEs in India
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Dyte
Acquired
What they do:
Real-time audio & video SDKs, ready to launch 🚀
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Awari
Acquired
What they do:
Reinventing lifelong learning for the future of work.
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Finley
Acquired
What they do:
Streamline your debt capital raise and management
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HQ: San Francisco, CA, United States
Uiflow
Acquired
What they do:
No-code platform for enterprise software companies
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HQ: San Francisco, CA, United States
FunctionUp (FanPlay)
Acquired
What they do:
A skill-tech platform that runs placement bootcamps
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Bueno Finance
Acquired
What they do:
Building Chime for India
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Preki
Acquired
What they do:
Shopify for LatAm
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Enable Us
Acquired
What they do:
Digital Sales Rooms (Acquired by MindTickle)
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HQ: San Francisco, CA, United States
Striga
Acquired
What they do:
Compliant Crypto and Banking Infrastructure
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HQ: Tallinn, Estonia
Promoted.ai
Acquired
What they do:
Dramatically better search and ads for marketplaces
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HQ: Seattle, WA, United States
OctiFi
Acquired
What they do:
Buy Now Pay Later for Southeast Asia
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HQ: Singapore
TaoFi
Acquired
What they do:
The financial layer for decentralized AI
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HQ: San Francisco, CA, United States
Trendpop
Acquired
What they do:
Discover trends as they happen
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HQ: San Francisco, CA, United States
Mono
Acquired
What they do:
Plaid for Africa, but better.
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inBalance
Acquired
What they do:
Electricity price forecasts for energy storage, ev charging, etc.
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HQ: San Francisco, CA, United States
PipeBio
Acquired
What they do:
PipeBio is a SaaS bioinformatics platform to develop antibody drugs.
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HQ: Aarhus, Denmark
Journey
Acquired
What they do:
No code platform for sales to tell better stories and win more deals.
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HQ: Remote
Emerge Tools
Acquired
What they do:
Supercharge your mobile apps
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HQ: Los Angeles, CA, United States
Fountain9
Acquired
What they do:
Helping food brands and retailers reduce food wastage
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HQ: San Francisco, CA, United States
Segments.ai
Acquired
What they do:
Build better computer vision models by building better datasets
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HQ: Brussels, Belgium
PingPong
Acquired
What they do:
Video messaging app for remote teams.
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HQ: Orem, UT, United States
Avenue
Acquired
What they do:
Observability platform for operations teams
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HQ: New York, NY, United States