What powers 21er.at?
Last seen Jun 2026 · 17 technologies across 12 categories
CMS
Databases
MySQL
since Jan 2023
Font scripts
Font Awesome
since Jan 2023
Twitter Emoji (Twemoji)
since May 2024
Hosting
World4You
since Jan 2023
JavaScript libraries
Swiper
since Jan 2023
Miscellaneous
RSS
since Jan 2023
Page builders
Performance
Priority Hints
since Aug 2023
Programming languages
PHP
since Jan 2023
Security
Really Simple SSL & Security
since Apr 2024
Web servers
Apache HTTP Server
since Jan 2023
Webmail
Microsoft 365
since Jan 2023
Audience
- 100% phone
Austria
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
1.44 / 10 · ranked #7,046,961 of all domains
5 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.8 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 2300 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: German
- Weight: 3.6 MB · 121 requests
- WordPress theme: estudiar (child: estudiar-child) · all themes
Homepage as crawled by the HTTP Archive, Jul 2026.
Full technology history →
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Recent changes
- detected Twitter Emoji (Twemoji) Dec 2025