What powers 4f.cz?
Last seen Jun 2026 · 36 technologies across 18 categories
Analytics
Google Analytics
since Jul 2020
Linkedin Insight Tag
since Mar 2021
Authentication
Facebook Login
since Jul 2021
CDN
Cloudflare
since Jun 2025
CMS
Databases
MySQL
since Jul 2020
Font scripts
Google Font API
since Jun 2026
JavaScript libraries
Marketing automation
MailChimp
since Jul 2021
Miscellaneous
Page builders
WordPress Block Editor
since Jun 2026
Performance
Priority Hints
since Jun 2026
Programming languages
PHP
since Jul 2020
Security
Cloudflare Bot Management
since Jun 2025
Really Simple SSL & Security
since Apr 2024
reCAPTCHA
since Jun 2026
Tag managers
Google Tag Manager
since Jul 2020
Video players
Web servers
Apache HTTP Server
since Jul 2020
WordPress plugins
Kadence WP Blocks
since Jun 2026
RankMath SEO
since Jun 2026
SVG Support
since Mar 2022
WP Fastest Cache
since Apr 2024
WordPress themes
Audience
Czechia
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
0.44 / 10 · ranked #30,268,397 of all domains
0 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.1 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 1000 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Czech
- Weight: 21.3 MB · 61 requests
- WordPress theme: kadence · all themes
- Structured data: JSON-LD, Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| www.4f.cz | 25 |
| 4f.cz | 17 |
Full technology history →
Report an incorrect detection
Recent changes
- dropped Nginx Mar 2026
- dropped WP Fastest Cache Mar 2026
- detected Apache HTTP Server Feb 2026
- detected SVG Support Dec 2025
- dropped SVG Support Oct 2025
- detected WP Fastest Cache Sep 2025