# What does Eulen use?

Eulen (eulen.app) shows public evidence of 13 tools, according to runsonwhat (last checked 2026-10-27).

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Website code |  |
| [Fastly](https://www.runsonwhat.com/reverse/fastly) | CDN & Edge | Website code |  |
| [GitHub Pages](https://www.runsonwhat.com/reverse/github-pages) | Hosting & Cloud | Custom domain, DNS records, Website code |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Fonts](https://www.runsonwhat.com/reverse/google-fonts) | Media & UI | Website code |  |
| [Astro](https://www.runsonwhat.com/reverse/astro) | Frontend | Website code |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [OneUptime](https://www.runsonwhat.com/reverse/oneuptime) | Monitoring | Custom domain, DNS verification records |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Mailchimp](https://www.runsonwhat.com/reverse/mailchimp) | Marketing | Email records |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records |  |
| [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code |  |
| [Resend](https://www.runsonwhat.com/reverse/resend) | Email Delivery | Email records |  |
| [Proton Mail](https://www.runsonwhat.com/reverse/proton) | Workspace | DNS verification records, Website code |  |
| [Apidog](https://www.runsonwhat.com/reverse/apidog) | Dev Tools | Custom domain |  |

## FAQ

### What tools does Eulen use?

As of October 2026, runsonwhat has found 13 tools at Eulen (eulen.app) in public records. Edge & Hosting: Cloudflare, Fastly and GitHub Pages. Application: Google Fonts and Astro. Data & Observability: OneUptime. Go-to-market: Mailchimp. Company Ops: Microsoft 365, Google Workspace and Resend. Last checked October 27, 2026.

### What cloud does Eulen run on?

Eulen uses GitHub Pages for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found GitHub Pages through a subdomain that points at GitHub Pages and DNS records. GitHub Pages is used by 4,065 companies runsonwhat tracks.

### What email provider does Eulen use?

Eulen uses Microsoft 365 for email and office software, alongside Google Workspace and Proton Mail, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365. Microsoft 365 is used by 715,077 companies runsonwhat tracks.

### What marketing software does Eulen use?

Eulen uses Mailchimp for marketing, according to runsonwhat (October 2026). runsonwhat found Mailchimp through email records that authorize Mailchimp. Mailchimp is used by 116,270 companies runsonwhat tracks.

### What monitoring tools does Eulen use?

Eulen uses OneUptime for monitoring, according to runsonwhat (October 2026). runsonwhat found OneUptime through a subdomain that points at OneUptime and a DNS verification record. OneUptime is used by 125 companies runsonwhat tracks.

### Does Eulen use Google Fonts?

Yes. runsonwhat found Google Fonts at Eulen through Google Fonts code on eulen.app. Google Fonts is a Media & UI tool used by 815,277 companies runsonwhat tracks.

### Which companies have a tech stack similar to Eulen's?

The companies with the stacks most like Eulen's are Suppy, Neo, Vórtx and TCN, according to runsonwhat (October 2026). Each shares 3 to 5 tools with Eulen, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what Eulen uses?

runsonwhat reads public records only. Of the 13 tools at Eulen, 4 were found through DNS records, 3 through code on eulen.app, 3 through email records and 3 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and eulen.app about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/eulen.app (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.