What powers era21.cz?
Last seen Jun 2026 · 11 technologies across 7 categories
Authentication
Facebook Login
since Nov 2021
CDN
Google Hosted Libraries
since Mar 2022
Font scripts
Google Font API
since Sep 2020
JavaScript libraries
Miscellaneous
HTTP/3
since Feb 2026
Programming languages
PHP
since Nov 2021
Web servers
Audience
Czechia
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
4.21 / 10 · ranked #451,861 of all domains
66 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Czech
- Weight: 1.2 MB · 162 requests
Homepage as crawled by the HTTP Archive, Jul 2026.