YC S18 Startups
Every Y Combinator Summer 2018 company we currently index — part of the latest YC companies rollup.
About YC S18
The Y Combinator S18 batch (Summer 2018) brought 100 tech startups into our index. This page lists every S18 company we currently track, with logos, taglines, and links straight to their own sites — no paywalled middleman. Notable S18 companies include RevenueCat, 64x Bio, Activeloop, Aesthetic, and Ajaib. Each profile surfaces team size, founding year, location, and open roles when their careers page is publicly scrapable. The S18 cohort skews toward Healthcare, Dev Tools, and Fintech — common patterns we see in this batch. Recurring tags across these companies: SaaS, Fintech, Artificial Intelligence, AI, Biotech. The directory's filter UI accepts any of them as a query. Geographically, the S18 batch we have leans toward San Francisco, New York City, and Los Angeles, with the rest spread across remote-first teams and other hubs. 1 of these is currently flagged as trending based on momentum signals; and the listing refreshes whenever the scrape runs, so changes propagate without a manual edit.
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Frequently asked questions
What is the YC S18 batch?
S18 is the Y Combinator batch code for the Summer 2018 cohort. Companies joining a YC batch go through a 3-month program in California and demo their product at the end. techstartupslist.com indexes 100 tech startups from this batch.
How many companies are in YC S18?
Our index currently tracks 100 active tech startups from the YC S18 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 S18?
Among the S18 companies indexed here: RevenueCat, 64x Bio, and Activeloop, and 97 more on this page. Click any profile for category, team size, founding year, and open roles.
Where can I find open jobs at YC S18 startups?
Open roles from indexed S18 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 S18 page updated?
Automated scrapers refresh this page daily. The last index update was 2026-09-02. Inactive companies fall out of the count automatically — we don't keep dead listings live.