Gameday
Shut down
What they do:
Play fantasy sports with friends on Facebook Messenger
Quick facts:
HQ: San Francisco, CA, United States
Y Combinator Summer 2017 Startups
This list has 125 startups and was last updated on Oct 15, 2026. 19 of them are hiring right now. Biggest hubs: San Francisco (60), New York (9), and London (6). Largest teams: Truepill, Flock Safety, and FAZZ.
125 startupsPage 4 of 4
Value Voting
Shut down
What they do:
Platform to defeat political extremism through strategic primary…
Quick facts:
Greo
Shut down
What they do:
Greo is a mobile video app for conversations about current events.
Quick facts:
HQ: San Francisco, CA, United States
Semantix
Shut down
What they do:
AI for medical billing
Quick facts:
HQ: San Francisco, CA, United States
Caelum Health
Shut down
What they do:
Caelum Health is replacing drugs with software. We use behavioral…
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HQ: San Francisco, CA, United States
Slik
Shut down
What they do:
Slik automates your sales.
Quick facts:
HQ: San Francisco, CA, United States
RideAlong
Shut down
What they do:
We save lives by giving police and health workers key info to safely…
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HQ: San Francisco, CA, United States
Storyboard
Shut down
What they do:
Social media management tool for Instagram and Snapchat
Quick facts:
HQ: San Francisco, CA, United States
Piggy
Shut down
What they do:
App for Indians to make investments in mutual funds, manage their…
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HQ: India
Goosebump
Shut down
What they do:
Find the best electronic music events in a single message.
Quick facts:
And Comfort
Shut down
What they do:
And Comfort is a direct to consumer fashion brand.
Quick facts:
HQ: San Francisco, CA, United States
Guggy
Shut down
What they do:
Guggy is building the messaging app of the future with real time,…
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What they do:
First agentic AI-powered community for 1 billion people with criminal…
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HQ: Miami, FL, United States
Bumpline
Shut down
What they do:
Captain Tailor is the Uber for tailoring.
Quick facts:
HQ: New York, NY, United States
WATERFX
Shut down
What they do:
The world's first 100% sustainable water provider (aka alternative…
Quick facts:
HQ: CA, United States
Modular Science
Shut down
What they do:
We're making it easier to do sustainable farming.
Quick facts:
HQ: San Francisco, CA, United States
YC S17Early stage
Prism Labs
Shut down
Quick facts:
HQ: San Francisco, CA, United States