What powers cerulean-blue.co.jp?
Last seen Jun 2026 · 24 technologies across 15 categories
Analytics
Google Analytics
since Feb 2019
Naver Analytics
since Apr 2022
Authentication
Facebook Login
since Jul 2021
CDN
Google Hosted Libraries
since Apr 2024
CMS
WordPress
since Feb 2019
Databases
MySQL
since Feb 2019
Font scripts
Google Font API
since Apr 2024
Issue trackers
Sentry
since Dec 2025
JavaScript frameworks
JavaScript libraries
Live chat
WhatsApp Business Chat
since Jul 2024
Miscellaneous
Programming languages
Security
HSTS
since Dec 2025
UI frameworks
MUI
since Dec 2025
Web servers
Apache HTTP Server
since Feb 2019
Audience
- 92% desktop
- 8% phone
Japan
South Korea
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
3.40 / 10 · ranked #1,010,932 of all domains
34 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.8 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 1700 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Japanese
- Weight: 30.5 MB · 95 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| book.cerulean-blue.co.jp | 13 |
| enjoyokinawa.cerulean-blue.co.jp | 12 |
| cerulean-blue.co.jp | 9 |
| www.cerulean-blue.co.jp | 9 |
| guidance.cerulean-blue.co.jp | 2 |
Full technology history →
Report an incorrect detection
Recent changes
- dropped Lightbox May 2026
- dropped WordPress Multisite May 2026
- detected WhatsApp Business Chat Apr 2026