What they do:
Measure and communicate engineering activity
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HQ: Amsterdam, Netherlands
Y Combinator Summer 2021 Startups
This list has 391 startups and was last updated on Oct 15, 2026. 86 of them are hiring right now. Biggest hubs: San Francisco (100), New York (36), and London (19). Largest teams: LemFi, ShipBlu, and Yummy. Latest round: Onebrief raised $151M (Oct 14, 2026).
391 startupsPage 8 of 11
What they do:
We help offline LatAm SMBs manage and accelerate their cash-flow
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What they do:
Preventive healthcare app for Latam.
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HQ: Mexico City, Mexico
What they do:
Building Shein of Home: tech-driven, design-mfr Home Lifestyle Brand
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HQ: Singapore
What they do:
Payments and scheduling for services professionals in LATAM
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What they do:
Our mobile app reduces chronic pain for 100 million Americans.
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HQ: Los Angeles, CA, United States
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Whaly is building a self-service analytics platform
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What they do:
Uber for Healthcare in Latinamerica
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What they do:
The Face Filter NFT Marketplace
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HQ: San Francisco, CA, United States
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Semi-Autonomous Diagnostics for Emergent Care
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HQ: FL, United States
What they do:
Inclusive mental healthcare for companies
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HQ: Remote
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We visually monitor space objects for governments and defense
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What they do:
A therapeutics platform for curing inflammatory disorders
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HQ: Boston, MA, United States
What they do:
Accounts receivable automation to help companies get paid faster
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HQ: Miami, FL, United States
What they do:
Conversational AI assistants using your knowledge
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HQ: San Francisco, CA, United States
What they do:
Build factory ready tech packs in minutes.
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HQ: Los Angeles, CA, United States
What they do:
Geostar drives inbound for companies through search.
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HQ: New York, NY, United States
What they do:
Sequin is building AI Voice Agents to automate collections calls for…
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HQ: San Francisco, CA, United States
What they do:
AI workflow engine for reliable systems
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HQ: New York, NY, United States
What they do:
Reinventing respiration monitoring
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HQ: Los Angeles, CA, United States
What they do:
Open-source monitoring for machine learning models
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HQ: London, United Kingdom
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Supply chain finance for consumer brands
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HQ: Honolulu, HI, United States
What they do:
Automated phone ordering system for restaurants
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HQ: San Francisco, CA, United States
What they do:
Growing seaweed to stabilize the climate.
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HQ: San Francisco, CA, United States
What they do:
Connect LinkedIn to your CRM to automate and track LinkedIn outreach.
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HQ: San Francisco, CA, United States
What they do:
The custom all-in-one OS for each company.
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What they do:
Robust & recursively self-improving general intelligence
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HQ: New York, NY, United States
What they do:
Incredibly reliable background task queues and cron jobs
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HQ: Austin, TX, United States
What they do:
Pelvic floor fitness made easy
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HQ: Chicago, IL, United States
What they do:
Visual AI shopping
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HQ: New York, NY, United States
YC S21Early stage
What they do:
Online University for Tech Professionals
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HQ: San Francisco, CA, United States
What they do:
Easy accounting for e-commerce
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HQ: San Francisco, CA, United States
YC S21Early stage
What they do:
Home medical equipment, prescribed online and delivered.
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HQ: Seattle, WA, United States
YC S21Early stage
Mailmodo
Acquired
What they do:
No-code email marketing platform to send forms & widgets within emails
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HQ: San Francisco, CA, United States
Zuma
Acquired
What they do:
We help businesses convert leads into sales in minutes using text
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HQ: Los Angeles, CA, United States
Deed
Acquired
What they do:
Making it easy for employees to donate and volunteer with good causes.
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HQ: New York, NY, United States