What powers r21.amsterdam?
Last seen Jun 2026 · 25 technologies across 14 categories
Advertising
Google AdSense
since Sep 2025
Analytics
Google Analytics
since Jan 2024
CMS
Databases
MySQL
since Jan 2024
Font scripts
Google Font API
since Jan 2024
Twitter Emoji (Twemoji)
since May 2024
JavaScript graphics
JavaScript libraries
LazySizes
since Sep 2025
Miscellaneous
Programming languages
PHP
since Jan 2024
Reservations & delivery
Formitable
since Jan 2024
Security
reCAPTCHA
since Sep 2025
Tag managers
Google Tag Manager
since Jan 2024
Web servers
Nginx
since Jan 2024
WordPress plugins
Jetpack Boost
since Sep 2025
wpBakery
since Jan 2024
Audience
- 66% phone
- 34% desktop
Netherlands
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
1.59 / 10 · ranked #5,761,652 of all domains
9 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.6 s |
| INP | 75 ms |
| CLS | 0.25 |
| TTFB | 2000 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Dutch (Netherlands)
- Weight: 4.4 MB · 132 requests
- WordPress theme: salient (child: salient-child) · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Full technology history →
Report an incorrect detection
Recent changes
- dropped Flickity May 2026
- detected HTTP/3 May 2026
- dropped Priority Hints May 2026
- detected Twitter Emoji (Twemoji) Dec 2025
- dropped HTTP/3 Nov 2025
- dropped Animate.css Oct 2025
- dropped Material Design Lite Oct 2025
- dropped Smash Balloon Instagram Feed Oct 2025
- detected Google AdSense Sep 2025
- detected HTTP/3 Sep 2025
- dropped Isotope Sep 2025
- detected Jetpack Boost Sep 2025
- detected LazySizes Sep 2025
- detected reCAPTCHA Sep 2025
- dropped Apache HTTP Server Aug 2025
- detected Site Kit Aug 2025
- dropped Varnish Aug 2025