# What does Duden use?

Duden (duden.de) shows public evidence of 24 tools, according to runsonwhat (last checked 2026-11-08).

- Industry: Publishing
- Size: 11–50 employees
- Based in: Berlin, Germany
- LinkedIn: https://www.linkedin.com/company/dudenverlag

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Amazon Route 53](https://www.runsonwhat.com/reverse/route53) | DNS | DNS records |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Astro](https://www.runsonwhat.com/reverse/astro) | Frontend | Website code |  |
| [Extensis](https://www.runsonwhat.com/reverse/extensis) | Media & UI | DNS verification records |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code |  |
| [Google Tag Manager](https://www.runsonwhat.com/reverse/gtm) | Analytics | Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Ad Manager](https://www.runsonwhat.com/reverse/google-ad-manager) | Ads & Pixels | Website code, Website config |  |
| [Microsoft Xandr](https://www.runsonwhat.com/reverse/xandr) | Ads & Pixels | Website config |  |
| [Magnite](https://www.runsonwhat.com/reverse/magnite) | Ads & Pixels | Website config |  |
| [Media.net](https://www.runsonwhat.com/reverse/media-net) | Ads & Pixels | Website config |  |
| [TripleLift](https://www.runsonwhat.com/reverse/triplelift) | Ads & Pixels | Website config |  |
| [Sharethrough](https://www.runsonwhat.com/reverse/sharethrough) | Ads & Pixels | Website config |  |
| [Taboola](https://www.runsonwhat.com/reverse/taboola) | Ads & Pixels | Website config |  |
| [Teads](https://www.runsonwhat.com/reverse/teads) | Ads & Pixels | Website config |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | Email records, DNS verification records |  |
| [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records |  |
| [Adobe](https://www.runsonwhat.com/reverse/adobe) | Collaboration | DNS verification records |  |
| [Postmark](https://www.runsonwhat.com/reverse/postmark) | Email Delivery | Email records |  |
| [Miro](https://www.runsonwhat.com/reverse/miro) | Collaboration | DNS verification records |  |
| [Cursor](https://www.runsonwhat.com/reverse/cursor) | Dev Tools | DNS verification records |  |
| [Docker](https://www.runsonwhat.com/reverse/docker) | Dev Tools | DNS verification records |  |
| [Amazon Business](https://www.runsonwhat.com/reverse/amazon-business) | Finance & Legal | DNS verification records |  |
| [rexx systems](https://www.runsonwhat.com/reverse/rexx) | People & HR | Email records |  |
| [MindManager](https://www.runsonwhat.com/reverse/mindmanager) | Collaboration | DNS verification records |  |

## FAQ

### What tools does Duden use?

As of November 2026, runsonwhat has found 24 tools at Duden (duden.de) in public records. Edge & Hosting: Amazon Route 53. Application: Astro and Extensis. Data & Observability: Google Analytics and Google Tag Manager. Go-to-market: Google Ad Manager, Microsoft Xandr and Magnite. Company Ops: Microsoft 365, SendGrid and Adobe. Last checked November 8, 2026.

### What email provider does Duden use?

Duden uses Microsoft 365 for email and office software, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through email records that authorize Microsoft 365 and a DNS verification record. Microsoft 365 is used by 736,680 companies runsonwhat tracks.

### What analytics tools does Duden use?

Duden uses Google Analytics for analytics, alongside Google Tag Manager, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on duden.de. Google Analytics is used by 904,091 companies runsonwhat tracks.

### What does Duden use for hiring and HR?

Duden uses rexx systems for hiring and HR, according to runsonwhat (November 2026). runsonwhat found rexx systems through email records that authorize rexx systems. rexx systems is used by 664 companies runsonwhat tracks.

### Does Duden use SendGrid?

Yes. runsonwhat found SendGrid at Duden through email records that authorize SendGrid. SendGrid is a Email Delivery tool used by 201,021 companies runsonwhat tracks.

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

The companies with the stacks most like Duden's are Verlag an der Ruhr, Cornelsen Verlag, Cornelsen Experimenta and TYPO3, according to runsonwhat (November 2026). Each shares 6 to 14 tools with Duden, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what Duden uses?

runsonwhat reads public records only. Of the 24 tools at Duden, 9 were found through DNS records, 7 through website configuration files, 4 through code on duden.de and 4 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and duden.de about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/duden.de (updated November 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.