What powers ultrachallenge.rs?
Last seen May 2026 · 17 technologies across 12 categories
CDN
cdnjs
since Jan 2022
Cloudflare
since Jul 2022
CMS
Woltlab Community Framework
since Aug 2025
Databases
Firebase
since Apr 2023
JavaScript frameworks
React
since Jul 2023
JavaScript libraries
Miscellaneous
Operating systems
Ubuntu
since Jul 2023
Programming languages
Security
HSTS
since Apr 2023
UI frameworks
Web frameworks
Express
since Jan 2022
Web servers
Audience
- 100% phone
Serbia
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
0.44 / 10 · ranked #30,774,486 of all domains
1 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.8 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Serbian
- Weight: 4.3 MB · 17 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| www.ultrachallenge.rs | 10 |
| ultrachallenge.rs | 8 |
Full technology history →
Report an incorrect detection
Recent changes
- detected PHP Aug 2025
- detected Woltlab Community Framework Aug 2025