What powers a21.cz?
Last seen Jun 2026 · 13 technologies across 8 categories
Analytics
Google Analytics
since Jul 2019
Google Call Conversion Tracking
since Feb 2025
JavaScript libraries
Miscellaneous
Open Graph
since May 2023
PWA
since May 2023
Operating systems
Windows Server
since May 2023
Tag managers
Google Tag Manager
since Nov 2024
Web frameworks
Web servers
Webmail
Microsoft 365
since Aug 2022
Audience
- 92% phone
- 5% desktop
- 3% tablet
Czechia
Slovakia
Croatia
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
2.26 / 10 · ranked #2,965,850 of all domains
9 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 125 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Czech
- Weight: 3.0 MB · 61 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.