What powers challengeclass.kr?
Last seen Jun 2026 · 24 technologies across 13 categories
Analytics
Naver Analytics
since Jun 2026
CDN
Ecommerce
Cafe24
since Jun 2026
Cart Functionality
since Jun 2026
Font scripts
Google Font API
since Jun 2026
JavaScript frameworks
JavaScript libraries
Live chat
Channel.io
since Jun 2026
Miscellaneous
Open Graph
since Jun 2026
Security
HSTS
since Jun 2026
Tag managers
Google Tag Manager
since Jun 2026
UI frameworks
Video players
YouTube
since Jun 2026
Web servers
Audience
- 88% desktop
- 12% phone
South Korea
Countries where the site has Chrome traffic, strongest markets first.
Core Web Vitals
| LCP | 1.7 s |
| INP | 50 ms |
| CLS | 0.3 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Korean
- Weight: 19.8 MB · 275 requests
- Structured data: JSON-LD, Microdata, OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.