as4u.cz website report
as4u.cz s.r.o. - as4u.cz s.r.o.
Last scanned
Overall score
Great
About as4u.cz
as4u.cz is a website. It describes itself as “Redakční systém Public4u, obchodní systém Shop4u, informace o firmě as4u.cz”.
Score profile
Top issues to fix
7 issues found · 2 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
+1 more issue — details in the sections below.
How it compares
as4u.cz scores higher overall than 40% of the 163,243 sites we have scanned.
vs. All scanned sites
163,243 sitesThe dot is this site; the tick is the typical (median) score for the group. The number on the right is the percentile: the share of the group this site scores above.
Technology stack
as4u.cz is built with jQuery.
Libraries (1)
Hosting & DNS
- IP address
- —
- ASN
- —
- IPv6
- Not supported
- HTTP
- HTTP/2
Show DNS record values
TXT record contents are not republished; only their count is shown.
Security
as4u.cz uses TLS 1.2 with a certificate valid for 158 more days and sets 2 of 6 recommended security headers.
Security headers2 of 6 set
- HSTSForces HTTPS
- CSPBlocks injected scripts
- X-Frame-OptionsStops clickjacking
- X-Content-TypeStops MIME sniffing
- Referrer-PolicyLimits URL leakage
- Permissions-PolicyRestricts browser features
TLS certificate
- Names covered
- 2
- Cookies set
- 0
Email security
as4u.cz scores D for email security, with SPF and DMARC policy “quarantine”.
- SPFWeak
Marks unlisted senders as suspicious (~all) but does not reject them.
- DMARCWeak
Forged mail is sent to spam.
- MTA-STSNot set
Not published; mail to this domain can be downgraded to plaintext.
- BIMINot set
Not published (optional).
Performance & carbon
as4u.cz scores 90/100 for performance, with an estimated load time of 1.7 s. A visit emits an estimated 0.21 g of CO2 (grade B).
Page weight
- HTML 60.9 KB
- JavaScript 431 KB
- CSS 84.4 KB
- Est. load
- 1.66 s
- Response
- 1.66 s
- Scripts / CSS
- 11 / 3
Carbon per visitB
0.21 g CO2 per uncached view
Estimate from the Sustainable Web Design model. HTML, JavaScript and CSS only; images, video and fonts are not measured. Treat it as a lower bound for comparing pages, not an audit.
SEO & accessibility
as4u.cz scores 65/100 for SEO and 90/100 for accessibility, with 5 SEO issues to fix.
Heading structure
No H1 found.
Image alt text
71 images · 0 without alt text · 0 lazy-loaded
Links
- Internal 21
- External 55
SEO issues5
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues1
- No H1 heading found
Technical details
Page metadata, social tags, crawl files and scan information.
Meta tags
- Title
- as4u.cz s.r.o. - as4u.cz s.r.o.
- Description
- Redakční systém Public4u, obchodní systém Shop4u, informace o firmě as4u.cz
- Canonical
- Language
- cs
- Robots meta
- ALL,FOLLOW
Crawl files
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
Structured data
No JSON-LD types declared.
- Microdata items
- 0
- RDFa items
- 0
Scan
- Final URL
- https://www.as4u.cz/
- HTTP status
- 200
- Redirects
- https://as4u.cz → https://www.as4u.cz/
- Scanned
- Aug 24, 2026, 1:23 PM
Own as4u.cz? Show your score
Add this badge to your site. It always shows the latest scan.
<a href="https://sitegraph.tech/site/as4u-cz"><img src="https://sitegraph.tech/badge/as4u-cz.svg" alt="as4u.cz on SiteGraph" width="190" height="20" /></a>See something wrong on this report? Request a correction or ask for something to be removed.
Related websites
Same technology stack
bazaart.com
AI design tools for small businesses | Bazaart
boschtt.net
Home | Bosch Home Comfort Group
arxivlens.com
ArxivLens - AI-Powered Academic Paper Search | arXiv...
axa.co.uk
AXA Insurance Quotes and Claims | AXA UK
bcdtravel.com
Business Travel Management & Corporate Travel | BCD Travel
buderus.com
Buderus - the system expert for HVAC
Frequently asked questions about as4u.cz
- What is as4u.cz?
- as4u.cz is a website. It describes itself as “Redakční systém Public4u, obchodní systém Shop4u, informace o firmě as4u.cz”.
- What technology does as4u.cz use?
- as4u.cz is built with jQuery.
- Is as4u.cz secure?
- as4u.cz uses TLS 1.2 with a certificate valid for 158 more days and sets 2 of 6 recommended security headers.
- Is as4u.cz protected against email spoofing?
- as4u.cz scores D for email security, with SPF and DMARC policy “quarantine”.
- How does as4u.cz compare with similar sites?
- as4u.cz scores higher overall than 40% of the 163,243 sites we have scanned.
- What is as4u.cz's overall score?
- as4u.cz has an overall SiteGraph score of 80/100, combining SEO (65), performance (90), security (80) and accessibility (90).
Open Graph & Twitter