Y Combinator's tech stack
What does Y Combinator use?
Y Combinator (ycombinator.com) uses at least 23 tools we can see from public records, including Amazon Web Services for hosting, Microsoft 365 for email and documents, Google Analytics for analytics and Mailchimp for marketing. Last checked .
- Tools found
- 23
- Categories
- 13
- Layers
- 5 of 5
- Last checked
- Oct 2026
Y Combinator's stack, layer by layer
Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.
Edge & Hosting
3 tools, where the bytes are served from
Application
6 tools, what the product is built with
Data & Observability
3 tools, what they measure and store
Monitoring
Go-to-market
3 tools, how they find and keep customers
Company Ops
8 tools, what the team runs on day to day
Email Delivery
Collaboration
People & HR
Companies like Y Combinator also use
Tools common among companies with a similar stack that we haven't found at Y Combinator.
Companies with a stack like Y Combinator's
Ranked by shared tools, with rare tools counting more.
imecResearch · 1,001–5,000 people6in common
DoorLoopSoftware · 201–1,000 people13in common
imec Vlaanderen1,001–5,000 people7in common
Cleveland ClinicResearch · 1,001–5,000 people7in common
GoFundMeCrowdfunding · 201–1,000 people14in common
TranscendSoftware · 51–200 people13in common
American GolfRetail · 201–1,000 people7in common
FastSpringSoftware As a Service14in common
Y Combinator tech stack FAQ
What tools does Y Combinator use?
We've found 23 tools at Y Combinator (ycombinator.com). Edge & Hosting: Cloudflare, Amazon Web Services and Amazon Route 53. Application: Google Fonts, Font Awesome and Google Maps. Data & Observability: Google Analytics, Sentry and PostHog. Go-to-market: Mailchimp and Campaign Monitor. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked October 2, 2026.
What cloud does Y Combinator run on?
Y Combinator uses Amazon Web Services for hosting. We found Amazon Web Services through website code.
What email provider does Y Combinator use?
Y Combinator uses Microsoft 365, Google Workspace and Apple Business for email and documents. We found Microsoft 365 through DNS verification records.
What analytics tools does Y Combinator use?
Y Combinator uses Google Analytics and PostHog for analytics. We found Google Analytics through website code.
What marketing software does Y Combinator use?
Y Combinator uses Mailchimp and Campaign Monitor for marketing. We found Mailchimp through email records.
What does Y Combinator use for hiring and HR?
Y Combinator uses Rippling for hiring and HR. We found Rippling through DNS verification records.
Does Y Combinator use Microsoft 365?
Yes. We found Microsoft 365 at Y Combinator through DNS verification records. Microsoft 365 is used by 685,234 companies we track.
How does runsonwhat know what Y Combinator uses?
We read public traces only: Y Combinator's DNS and email records, certificate logs, the code its website loads, and published subprocessor lists. A tool is listed only when a direct record backs it up. DNS is rechecked weekly and the website monthly.
We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.