What powers 4book.org?
Last seen Jun 2026 · 16 technologies across 15 categories
Advertising
Google AdSense
since May 2022
Analytics
Cookie compliance
Funding Choices
since May 2023
Font scripts
Google Font API
since Sep 2021
JavaScript frameworks
JavaScript libraries
Mobile frameworks
jQuery-pjax
since Jan 2019
Performance
Turbolinks
since Oct 2021
Photo galleries
PhotoSwipe
since Sep 2022
Programming languages
Ruby
since Jun 2018
Security
reCAPTCHA
since May 2022
Tag managers
Google Tag Manager
since May 2022
Web frameworks
Ruby on Rails
since Jun 2018
Web servers
Widgets
ShareThis
since May 2023
Audience
- 68% phone
- 26% desktop
- 6% tablet
Ukraine
Germany
Poland
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
3.34 / 10 · ranked #1,074,268 of all domains
30 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.4 s |
| INP | 150 ms |
| CLS | 0.05 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Weight: 1.0 MB · 56 requests
- Structured data: Microdata
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| 4book.org | 16 |
| www.4book.org | 7 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Google Font API Nov 2025
- detected Funding Choices Aug 2025
- detected reCAPTCHA Aug 2025