SBatch S21
YC S21 Companies
478 Y Combinator S21 startups with verified founder contacts, company status, and team data.
478
Companies
Summer
Season
2021
Year
YC Company Directory
50 companies
Company | Batch | Description | Status | Location | Team | Site | Founders | Reveal |
|---|---|---|---|---|---|---|---|---|
Reframe (Glucobit) | S21 | App to help people quit or cut back on alcohol use | Active | Atlanta, GA, USA | 35 | Vedant Pradeep, Ziyi Gao | Reveal | |
RendaloMaq | S21 | Tech-powered equipment rentals in Latam. | Active | Santiago, Santiago Metropolitan Region, Chile | 25 | Ariel Vaisman | Reveal | |
RendaloMaq | S21 | Tech-powered equipment rentals in Latam. | Active | Santiago, Santiago Metropolitan Region, Chile | 25 | Ariel Vaisman, Juan Pablo Mir | Reveal | |
Replo | S21 | Sell anything | Active | San Francisco, CA, USA | 20 | Yuxin Zhu | Reveal | |
Repool | S21 | Modernizing hedge fund back office software and services. | Active | New York City, NY, USA; New York, NY, USA | 11 | Kevin Fu, Justin Carrao | Reveal | |
Revery AI | S21 | Tiktok for fashion - where designers show their work + build traction | Inactive | Emeryville, CA, USA | 5 | Kedan Li, Min Jin Chong, Jeffrey Zhang | Reveal | |
Revolve Surgical | S21 | Surgical robotics for every operating room | Active | Toronto, ON, Canada | 8 | Alex Gordon, Matthew Kang | Reveal | |
Rinse | S21 | We're building the One Medical for dental | Active | San Francisco, CA, USA | 6 | Casey Harlin | Reveal | |
Rivia.AI | S21 | Interactive Product Demos | Active | Bengaluru, Karnataka, India | 5 | Samay Jain | Reveal | |
RMFG | S21 | Advanced Contract MFG for fast moving hardware companies | Active | Fort Worth, TX, USA | 9 | Kenneth Cassel | Reveal | |
RMFG | S21 | Advanced Contract MFG for fast moving hardware companies | Active | Fort Worth, TX, USA | 9 | Kenneth Cassel | Reveal | |
Rootly | S21 | AI-native on-call and incident response carefully crafted to help… | Active | San Francisco, CA, USA; Remote | 75 | Quentin Rousseau, JJ Tang | Reveal | |
Ruth Health | S21 | Telehealth hub for pregnant people 🧡 | Inactive | New York City, NY, USA; Los Angeles, CA, USA; New York, NY, USA; Remote | 8 | Alison Greenberg, Audrey Wu | Reveal | |
SafeBeat | S21 | Guiding cardiac therapeutics - all from your phone | Active | San Francisco, CA, USA | 9 | Rachita Navara | Reveal | |
SalaryBook | S21 | Mobile first solution for Payroll, employee & expense management | Active | Bengaluru, Karnataka, India | 7 | Apoorva Sharma, Poorva Dixit | Reveal | |
SalaryBox | S21 | Gusto for India | Active | Gurugram, HR, India | 40 | Nikhil Goel, Peeyush Goyal | Reveal | |
Satsuma | S21 | Reliable blockchain indexing & querying for web3 engineering teams. | Acquired | San Francisco, CA, USA; Remote | 5 | Jonathan Kau, Dan Li | Reveal | |
Satsuma | S21 | Reliable blockchain indexing & querying for web3 engineering teams. | Acquired | San Francisco, CA, USA | 5 | Jonathan Kau, Dan Li | Reveal | |
Scispot | S21 | The Best Data Infrastructure for Biotechs | Active | Kitchener, ON, Canada | 16 | Guru Singh, Satya Singh | Reveal | |
Secoda | S21 | Secoda is the AI layer for your Analytics | Active | Toronto, ON, Canada | 27 | Etai Mizrahi, Andrew McEwen | Reveal | |
SenpAI.GG | S21 | Personal gaming coach for PC gamers globally | Inactive | Boston, MA, USA | 12 | Olcay Yilmazcoban, Berk Ozer | Reveal | |
Sensible Biotechnologies | S21 | Unlocking the next generation of mRNA medicines | Active | Oxford, England, United Kingdom | 24 | Miroslav Gasparek, Marian Kupculak | Reveal | |
Sentiyen | S21 | Conversational AI assistants using your knowledge | Active | San Francisco, CA, USA | 2 | Alex Perelman, Nathan Shinder | Reveal | |
Sentiyen | S21 | Conversational AI assistants using your knowledge | Active | San Francisco, CA, USA; Remote | 2 | Alex Perelman, Nathan Shinder | Reveal | |
Sequin | S21 | Sequin is building AI Voice Agents to automate collections calls for… | Active | San Francisco, CA, USA | 2 | Vrinda Gupta, Mark Thomas | Reveal | |
SFA Therapeutics | S21 | Regulating the immune system to block cancer & autoimmune diseases | Active | Philadelphia, PA, USA | 4 | Ira Spector, Alla Arzumanyan, Mark Feitelson | Reveal | |
Shimmer | S21 | 1:1 ADHD coaching, 5-10X More affordable than alternatives | Active | San Francisco, CA, USA | 9 | Christal Wang, Vikram Sreedhar | Reveal | |
ShipBlu | S21 | Amazon Level Logistics for eCommerce Companies in MENA. | Active | Cairo, Cairo Governorate, Egypt | 300 | Ali Nasser, Ahmed ElKawass, Abdelrahman Hosny | Reveal | |
Siglo | S21 | Home Internet for urban Latin America | Active | Mexico City, CDMX, Mexico | 20 | Joel Phillips, Isaac Phillips | Reveal | |
SigmaOS | S21 | The new home for your internet 🏡 | Active | San Francisco, CA, USA; London, England, United Kingdom | 5 | Mahyad Ghassemi, Ali Attar, Saurav Mitra | Reveal | |
SigmaOS | S21 | The new home for your internet 🏡 | Active | London, UK | 5 | Mahyad Ghassemi, Ali Attar, Saurav Mitra | Reveal | |
SigmaOS | S21 | The new home for your internet 🏡 | Active | London, UK | 5 | Mahyad Ghassemi, Ali Attar, Saurav Mitra | Reveal | |
Sirka | S21 | Noom for Southeast Asia | Active | Jakarta, Jakarta, Indonesia; Remote | 9 | Ditto R, Dito Krista | Reveal | |
Sirka | S21 | Noom for Southeast Asia | Active | Jakarta, Indonesia | 9 | Ditto R, Dito Krista | Reveal | |
Sitenna | S21 | Compound B2B SaaS for modern infrastructure to deploy and manage sites | Active | Atlanta, GA, USA | 7 | Daniel Campion, Brian Sexton | Reveal | |
Sitenna | S21 | Compound B2B SaaS for modern infrastructure to deploy and manage sites | Active | Atlanta, GA, USA; Remote | 7 | Daniel Campion, Brian Sexton | Reveal | |
Slash | S21 | Business banking that understands your industry's unique challenges | Active | San Francisco, CA, USA | 35 | Victor Cardenas, Kevin Bai | Reveal | |
Slash | S21 | Banking, corporate cards, stablecoin payments – available globally. | Active | San Francisco, CA, USA | 70 | Victor Cardenas, Kevin Bai | Reveal | |
Sleek | S21 | 1-click checkout from every store on the internet + cashback rewards. | Acquired | Toronto, ON, Canada | 5 | Adam MacEachern, Daniel Baum, Palmer McCutcheon | Reveal | |
Sleek | S21 | Browser automation for businesses. | Acquired | Toronto, ON, Canada | 5 | Adam MacEachern, Daniel Baum, Palmer McCutcheon | Reveal | |
Slope | S21 | The B2B Payments Platform | Active | San Francisco, CA, USA | 16 | Lawrence Lin Murata, Alice Deng | Reveal | |
Slope | S21 | The B2B Payments Platform | Active | San Francisco, CA, USA | 16 | Lawrence Lin Murata, Alice Deng | Reveal | |
SnapCalorie | S21 | Single photo nutrition tracking. | Active | New York City, NY, USA; Washington, DC, USA | 5 | Wade Norris, Scott Baron | Reveal | |
SnapCalorie | S21 | Single photo nutrition tracking. | Active | New York, NY, USA | 5 | Wade Norris, Scott Baron | Reveal | |
Soco | S21 | Visual AI shopping | Active | New York, NY, USA | — | Omar Thanawalla | Reveal | |
SolarMente | S21 | Home electrification at $0 upfront cost | Inactive | Barcelona, CT, Spain | 65 | Victor Gardrinier, Wouter Draijer | Reveal | |
Spark Studio | S21 | The most magical personal Voice-Led AI English Learning Buddy for Kids | Active | Bengaluru, Karnataka, India | 27 | Anushree Goenka, Namita Goel, Kaustubh Khade, Jyothika Sahajanandan | Reveal | |
Spoken | S21 | Never overpay online | Inactive | New York, NY, USA | 7 | Dane Hurtubise, Geoff Abraham | Reveal | |
Stardex | S21 | AI native ATS + CRM for executive search firms | Active | San Francisco, CA, USA | 3 | Sanket Chauhan, Pranav Badami | Reveal | |
Stardex | S21 | AI native ATS + CRM for executive search firms | Active | San Francisco, CA, USA | 6 | Sanket Chauhan, Pranav Badami | Reveal |
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