What powers 
rytmus.org?
Last seen Sep 2026 · 45 technologies across 20 categories
Analytics
CMS
Databases
Font scripts
JavaScript graphics
JavaScript libraries
Miscellaneous
Operating systems
Performance
Photo galleries
Programming languages
Retargeting
Security
Tag managers
UI frameworks
Web frameworks
Web servers
Webmail
Widgets
WordPress plugins
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 79% phone
- 21% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.53 / 10 · ranked #396,876 of all domains
79 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.9 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 1200 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Czech
- Weight: 2.7 MB · 97 requests
- Structured data: JSON-LD, Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
From the homepage's own structured data (Oct 2026).
Infrastructure
- Registered Dec 2002 (23 years) via PDR Ltd. d/b/a PublicDomainRegistry.com, renews Dec 2028
- Hosted on Websupport (37.9.175.163, IPv6)
- DNS: websupport.cz
- Email: Google Workspace
- Email security: no SPF record, no DMARC record
- SSL: Let's Encrypt, RSA 4096, wildcard, expires Dec 2026
- Common Crawl link graph: rank 2,638,526, 10 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| rytmus.org | 27 |
| kurzy.rytmus.org | 21 |
| www.rytmus.org | 16 |
| vzdelavani.rytmus.org | 11 |
Full technology history →
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Recent changes
- dropped FullCalendar Aug 2026
- dropped jQuery UI Aug 2026
- dropped Select2 Aug 2026
- dropped TypeScript Aug 2026