What powers cs50.jp?
Last seen Jun 2026 · 14 technologies across 12 categories
CMS
Databases
MySQL
since Jul 2021
Font scripts
Google Font API
since Jul 2021
Twitter Emoji (Twemoji)
since Jul 2021
JavaScript libraries
Miscellaneous
RSS
since Dec 2022
Page builders
WordPress Block Editor
since Jul 2024
Performance
Priority Hints
since Aug 2023
Programming languages
PHP
since Jul 2021
UI frameworks
Video players
YouTube
since Jul 2021
Web servers
Nginx
since Jul 2021
WordPress themes
Colorlib Sparkling
since Feb 2022
Audience
- 90% desktop
- 10% phone
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
3.32 / 10 · ranked #1,105,723 of all domains
24 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Japanese
- Weight: 1.8 MB · 49 requests
- WordPress theme: sparkling · all themes
Homepage as crawled by the HTTP Archive, Jul 2026.
Full technology history →
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Recent changes
- dropped Google Analytics Mar 2026
- dropped MonsterInsights Mar 2026
- detected Twitter Emoji (Twemoji) Dec 2025