Castbook's tech stack
What does Castbook use?
Castbook (castbook.jp) uses at least 7 tools we can see from public records, including Microsoft 365 for email and documents and Google Analytics for analytics. Last checked .
- Based in
- Japan
- Tools found
- 7
- Categories
- 5
- Layers
- 5 of 5
- Last checked
- Oct 2026
Castbook's stack, layer by layer
Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.
Edge & Hosting
1 tool, where the bytes are served from
Application
1 tool, what the product is built with
Media & UI
Data & Observability
3 tools, what they measure and store
Go-to-market
1 tool, how they find and keep customers
Ads & Pixels
Company Ops
1 tool, what the team runs on day to day
Workspace
Castbook tech stack FAQ
What tools does Castbook use?
As of October 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 October 26, 2026.
What email provider does Castbook use?
Castbook uses Microsoft 365 for email and office software, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through email records that authorize Microsoft 365 and a DNS verification record. Microsoft 365 is used by 715,733 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 (October 2026). runsonwhat found Google Analytics through Google Analytics code on castbook.jp. Google Analytics is used by 894,716 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 818,571 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.
We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.