# What does EF use?

EF (ef-danmark.dk) shows public evidence of 8 tools, according to runsonwhat (last checked 2026-10-31).

- Based in: Denmark

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | DNS records, Website code |  |
| [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Website code |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code |  |
| [Chatbase](https://www.runsonwhat.com/reverse/chatbase) | AI | Website code |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Optimizely](https://www.runsonwhat.com/reverse/optimizely) | Flags & Experiments | Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Storyblok](https://www.runsonwhat.com/reverse/storyblok) | Website & CMS | Website code |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records, Email records |  |

## FAQ

### What tools does EF use?

As of November 2026, runsonwhat has found 8 tools at EF (ef-danmark.dk) in public records. Edge & Hosting: Cloudflare and Amazon CloudFront. Application: Next.js and Chatbase. Data & Observability: Optimizely. Go-to-market: Storyblok. Company Ops: Microsoft 365. Last checked October 31, 2026.

### What email provider does EF use?

EF uses Microsoft 365 for email and office software, according to runsonwhat (November 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365 and email records. Microsoft 365 is used by 719,732 companies runsonwhat tracks.

### What is EF's website built with?

EF uses Storyblok for its website, according to runsonwhat (November 2026). runsonwhat found Storyblok through Storyblok code on ef-danmark.dk. Storyblok is used by 2,775 companies runsonwhat tracks.

### Does EF use Cloudflare?

Yes. runsonwhat found Cloudflare at EF through DNS records that point at Cloudflare and code on ef-danmark.dk. Cloudflare is a CDN & Edge tool used by 725,063 companies runsonwhat tracks.

### Does EF use AI tools?

Yes. runsonwhat has found Chatbase at EF; Chatbase, for example, through Chatbase code on ef-danmark.dk. AI services called only from servers leave no public trace, so EF may use more AI tools than these.

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

The companies with the stacks most like EF's are GB Bank, West Central Technology, Visobath and Leonardo Technology, S.r.o., according to runsonwhat (November 2026). Each shares 3 to 4 tools with EF, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

### How does runsonwhat know what EF uses?

runsonwhat reads public records only. Of the 8 tools at EF, 5 were found through code on ef-danmark.dk, 3 through DNS records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and ef-danmark.dk about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/ef-danmark.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.