seznamka.cz

Readiness by lane

Green: seznamka.cz. Thin bar: Dating Apps peer median.

Priority fixes for seznamka.cz

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Harden

   DMARC policy enforces quarantine or reject

   Observed: No DMARC record was found at _dmarc.seznamka.cz.

   Why it matters: An enforcing DMARC policy helps receiving mail systems reject email that falsely claims to come from your domain, a common route for phishing your customers.

   What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.

   42% of Dating Apps peers do this. Limit: Read from public DNS at the time of the check; records may have changed since.

   Guide: A Practical Website Health Check for Owners

2. Priority 2 · Accelerate

   No render-blocking scripts in <head>

   Observed: The homepage <head> loaded 1 external script without async or defer.

   What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.

   54% of Dating Apps peers do this.

   Guide: Control Third-Party Scripts Before They Control Your Page

3. Priority 3 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   22% of Dating Apps peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

4. Priority 4 · Accelerate

   Modern image formats in use

   Observed: The homepage had 55 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   27% of Dating Apps peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

What seznamka.cz already does well

Practices fewer than half of Dating Apps peers use.

• Nameservers spread across providersNameservers spread across more than one operator.7.3% of peers
• DNSSEC signedDNSSEC delegation (DS record) present.8.3% of peers
• Structured data presentJSON-LD structured data found.29% of peers

What we saw

Homepage checked

https://www.seznamka.cz/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Let's Encrypt, 89-day validity, expiring 2027-01-01

DNS operators

3 self-run or other nameserver domains

Homepage HTML

96 KB, gzip

Images on homepage

55 (jpg 72, svg 18, png 1)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Dating Apps sites

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Dating Apps readiness benchmark