# What does Fastspeed use?

Fastspeed (fastspeed.dk) shows public evidence of 12 tools, according to runsonwhat (last checked 2026-11-04).

- Industry: Internet
- Size: 11–50 employees
- Based in: København NV, Denmark
- Founded: 2018
- LinkedIn: https://www.linkedin.com/company/fastspeed-aps

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records |  |
| [Microsoft Entra ID](https://www.runsonwhat.com/reverse/entra-id) | Auth & Identity | Custom domain |  |
| [SvelteKit](https://www.runsonwhat.com/reverse/sveltekit) | Frontend | Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Ahrefs](https://www.runsonwhat.com/reverse/ahrefs) | Marketing | DNS verification records |  |
| [Dixa](https://www.runsonwhat.com/reverse/dixa) | Support & Docs | Email records |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | Email records, DNS verification records, Website code |  |
| [SendGrid](https://www.runsonwhat.com/reverse/sendgrid) | Email Delivery | Email records |  |
| [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records |  |
| [Mailchimp Transactional](https://www.runsonwhat.com/reverse/mandrill) | Email Delivery | Email records |  |
| [Cookie Information](https://www.runsonwhat.com/reverse/cookie-information) | Security & Compliance | Website code |  |
| [DMARC Digests](https://www.runsonwhat.com/reverse/dmarcdigests) | Security & Compliance | Email records |  |

## FAQ

### What tools does Fastspeed use?

As of November 2026, runsonwhat has found 12 tools at Fastspeed (fastspeed.dk) in public records. Application: Anthropic, Microsoft Entra ID and SvelteKit. Go-to-market: Ahrefs and Dixa. Company Ops: Microsoft 365, SendGrid and Apple Business. Last checked November 4, 2026.

### What email provider does Fastspeed use?

Fastspeed uses Microsoft 365 for email and office software, alongside Apple Business, 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 729,238 companies runsonwhat tracks.

### What does Fastspeed use for customer support?

Fastspeed uses Dixa for customer support and documentation, according to runsonwhat (November 2026). runsonwhat found Dixa through email records that authorize Dixa. Dixa is used by 296 companies runsonwhat tracks.

### What marketing software does Fastspeed use?

Fastspeed uses Ahrefs for marketing, according to runsonwhat (November 2026). runsonwhat found Ahrefs through a DNS verification record for Ahrefs. Ahrefs is used by 24,273 companies runsonwhat tracks.

### What does Fastspeed use for login and identity?

Fastspeed uses Microsoft Entra ID for sign-in and identity, according to runsonwhat (November 2026). runsonwhat found Microsoft Entra ID through a subdomain that points at Microsoft Entra ID. Microsoft Entra ID is used by 3,233 companies runsonwhat tracks.

### Does Fastspeed use SendGrid?

Yes. runsonwhat found SendGrid at Fastspeed through email records that authorize SendGrid. SendGrid is a Email Delivery tool used by 199,351 companies runsonwhat tracks.

### Does Fastspeed use AI tools?

Yes. runsonwhat has found Anthropic at Fastspeed; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Fastspeed may use more AI tools than these.

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

The companies with the stacks most like Fastspeed's are Printler, Paperseal, Greenbow and Unisport, according to runsonwhat (November 2026). Each shares 3 to 5 tools with Fastspeed, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what Fastspeed uses?

runsonwhat reads public records only. Of the 12 tools at Fastspeed, 5 were found through email records, 4 through DNS records, 2 through code on fastspeed.dk and 1 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and fastspeed.dk about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/fastspeed.dk (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.