# What does Circle B use?

Circle B (circleb.eu) shows public evidence of 11 tools, according to runsonwhat (last checked 2026-11-08).

- Industry: IT Services
- Size: 51–200 employees
- Based in: Schiphol-Rijk, Netherlands
- Founded: 2015
- LinkedIn: https://www.linkedin.com/company/circle-b

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [HubSpot](https://www.runsonwhat.com/reverse/hubspot) | Sales & CRM | Custom domain, Email records |  |
| [Brevo](https://www.runsonwhat.com/reverse/brevo) | Marketing | DNS verification records, Email records |  |
| [Zoho](https://www.runsonwhat.com/reverse/zoho) | Sales & CRM | DNS verification records, Email records |  |
| [HubSpot CMS](https://www.runsonwhat.com/reverse/hubspot-cms) | Website & CMS | Custom domain |  |
| [Ahrefs](https://www.runsonwhat.com/reverse/ahrefs) | Marketing | DNS verification records |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Microsoft 365](https://www.runsonwhat.com/reverse/microsoft-365) | Workspace | DNS verification records, Email records |  |
| [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records |  |
| [Atlassian](https://www.runsonwhat.com/reverse/atlassian) | Dev Tools | DNS verification records |  |
| [Exclaimer](https://www.runsonwhat.com/reverse/exclaimer) | Workspace | Email records |  |

## Recent changes at Circle B

- 2026-11-01: started using [Anthropic](https://www.runsonwhat.com/reverse/anthropic)

## FAQ

### What tools does Circle B use?

As of November 2026, runsonwhat has found 11 tools at Circle B (circleb.eu) in public records. Application: Anthropic. Go-to-market: HubSpot, Brevo and Zoho. Company Ops: Microsoft 365, Google Workspace and Atlassian. Last checked November 8, 2026.

### What CRM does Circle B use?

Circle B uses HubSpot for its CRM, alongside Zoho, according to runsonwhat (November 2026). runsonwhat found HubSpot through a subdomain that points at HubSpot and email records. HubSpot is used by 97,658 companies runsonwhat tracks.

### What email provider does Circle B use?

Circle B uses Microsoft 365 for email and office software, alongside Google Workspace and Exclaimer, 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 734,344 companies runsonwhat tracks.

### What is Circle B's website built with?

Circle B uses HubSpot CMS for its website, according to runsonwhat (November 2026). runsonwhat found HubSpot CMS through a subdomain that points at HubSpot CMS. HubSpot CMS is used by 34,582 companies runsonwhat tracks.

### What marketing software does Circle B use?

Circle B uses Brevo for marketing, alongside Ahrefs, according to runsonwhat (November 2026). runsonwhat found Brevo through a DNS verification record for Brevo and email records. Brevo is used by 84,271 companies runsonwhat tracks.

### Does Circle B use Anthropic?

Yes. runsonwhat found Anthropic at Circle B through a DNS verification record for Anthropic. Anthropic is a AI tool used by 72,675 companies runsonwhat tracks.

### Does Circle B use AI tools?

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

### Has Circle B changed tools recently?

Yes. On runsonwhat's rechecks, Circle B started using Anthropic (latest on November 1, 2026). A change counts only between two checks of circleb.eu done the same way.

### How does runsonwhat know what Circle B uses?

runsonwhat reads public records only. Of the 11 tools at Circle B, 7 were found through DNS records, 2 through email records and 2 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and circleb.eu about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/circleb.eu (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.