# What does YC Roaster use?

YC Roaster (ycroaster.com) shows public evidence of 10 tools, according to runsonwhat (last checked 2026-10-09).

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | Email records, DNS records, Website code |  |
| [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS records, Website code |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code |  |
| [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code |  |
| [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code |  |
| [Firebase](https://www.runsonwhat.com/reverse/firebase) | Backend & Database | DNS verification records |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code |  |
| [PostHog](https://www.runsonwhat.com/reverse/posthog) | Analytics | Website code |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Resend](https://www.runsonwhat.com/reverse/resend) | Email Delivery | Email records |  |

## Recent changes at YC Roaster

- 2026-10-09: started using [Firebase](https://www.runsonwhat.com/reverse/firebase)

## FAQ

### What tools does YC Roaster use?

As of October 2026, runsonwhat has found 10 tools at YC Roaster (ycroaster.com) in public records. Edge & Hosting: Cloudflare and Vercel. Application: React, Tailwind CSS and Next.js. Data & Observability: web-vitals and PostHog. Company Ops: Resend. Last checked October 9, 2026.

### What cloud does YC Roaster run on?

YC Roaster uses Vercel for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Vercel through a subdomain that points at Vercel and DNS records. Vercel is used by 47,027 companies runsonwhat tracks.

### What analytics tools does YC Roaster use?

YC Roaster uses PostHog for analytics, according to runsonwhat (October 2026). runsonwhat found PostHog through PostHog code on ycroaster.com. PostHog is used by 9,485 companies runsonwhat tracks.

### What monitoring tools does YC Roaster use?

YC Roaster uses web-vitals for monitoring, according to runsonwhat (October 2026). runsonwhat found web-vitals through web-vitals code on ycroaster.com. web-vitals is used by 26,290 companies runsonwhat tracks.

### Does YC Roaster use Cloudflare?

Yes. runsonwhat found Cloudflare at YC Roaster through email records that authorize Cloudflare and DNS records. Cloudflare is a CDN & Edge tool used by 694,962 companies runsonwhat tracks.

### Has YC Roaster changed tools recently?

Yes. On runsonwhat's rechecks, YC Roaster started using Firebase (latest on October 9, 2026). A change counts only between two checks of ycroaster.com done the same way.

### How does runsonwhat know what YC Roaster uses?

runsonwhat reads public records only. Of the 10 tools at YC Roaster, 5 were found through code on ycroaster.com, 2 through email records, 1 through website configuration files, 1 through subdomains that point at the vendor and 1 through DNS records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and ycroaster.com about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/ycroaster.com (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.