What powers d21.co.jp?
Last seen Jun 2026 · 26 technologies across 17 categories
Advertising
Analytics
CDN
CMS
JavaScript frameworks
JavaScript Libraries
Miscellaneous
PaaS
Performance
Programming Languages
Security
Segmentation
Tag managers
Web servers
Webmail
Widgets
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| the highly sensitive person | #91 | 8 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
Audience
- 75% phone
- 24% desktop
- 1% tablet
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
6.63 / 10 · ranked #67,536 of all domains
314 referring domains · OpenPageRank
Search traffic
8 est. monthly organic visits (US)
1 keywords in Google's top 30
Core Web Vitals
| LCP | 1.3 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Weight: 12.1 MB · 170 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| d21.co.jp | 21 |
| ftp.d21.co.jp | 19 |
| coach.d21.co.jp | 8 |
| www.d21.co.jp | 4 |
Full technology history →
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Recent changes
- detected Priority Hints Mar 2026