# What does Castbook use?

Castbook (castbook.jp) shows public evidence of 7 tools, according to runsonwhat (last checked 2026-11-02).

- Based in: Japan

## Edge & Hosting

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

## Application

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

## 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 |  |
| [Microsoft Clarity](https://www.runsonwhat.com/reverse/clarity) | Analytics | Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Ads](https://www.runsonwhat.com/reverse/google-ads) | Ads & Pixels | Website code |  |

## Company Ops

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

## FAQ

### What tools does Castbook use?

As of November 2026, runsonwhat has found 7 tools at Castbook (castbook.jp) in public records. Edge & Hosting: Amazon Route 53. Application: Google Fonts. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Google Ads. Company Ops: Microsoft 365. Last checked November 2, 2026.

### What email provider does Castbook use?

Castbook 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 722,170 companies runsonwhat tracks.

### What analytics tools does Castbook use?

Castbook uses Google Analytics for analytics, alongside Google Tag Manager and Microsoft Clarity, according to runsonwhat (November 2026). runsonwhat found Google Analytics through Google Analytics code on castbook.jp. Google Analytics is used by 906,046 companies runsonwhat tracks.

### Does Castbook use Google Fonts?

Yes. runsonwhat found Google Fonts at Castbook through Google Fonts code on castbook.jp. Google Fonts is a Media & UI tool used by 825,964 companies runsonwhat tracks.

### How does runsonwhat know what Castbook uses?

runsonwhat reads public records only. Of the 7 tools at Castbook, 5 were found through code on castbook.jp, 1 through email records and 1 through DNS records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and castbook.jp about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/castbook.jp (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.