skolapotapeni.cz

https://skolapotapeni.cz· First analyzed 28 May 2026· Updated 28 May 2026

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skolapotapeni.cz

Mobile

Sponsored

Hosting Provider

Websupport s.r.o.

IP Address

37.9.175.212

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇸🇰 Bratislava, Slovakia

ASN

AS51013

Organization

Websupport s.r.o.

Server

OpenResty

Nameservers

ns1.websupport.cz.ns2.websupport.cz.ns3.websupport.eu.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

594 ms10%

Speed Index

772 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

331 KB

37 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Websupport s.r.o.

Technology Stack

2 Technologies Detected

Analytics

Google Analytics

Web Servers

OpenResty

SEO Analysis

D47/100

Meta Tags10/15

Content12/12

Headings0/8

Technical7/25

E-E-A-T3/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

skolapotapeni.czskolapotapeni.cz

Potápěčské centrum Don Felder, škola potápění

škola potápění v Lanškrouně

Title Length45 chars

Recommended: 50-60 chars (~275px / 580px)

Description Length27 chars

Recommended: 120-160 chars

Issues (3)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (59/64) — critical for accessibility and SEO
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

15 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

2/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F31/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

0/25

Citation

4/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:8%

Words:719

Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary17w

Descriptive Headings

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

36/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

3/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

3/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

5 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

67/100

A+

34 mg

CO₂e / view

331.3 KB

Page Weight

90%

Cleaner Than

New Visitor

38 mg

Returning (cached)

19 mg

Annual (10K/mo)

4.0 kg

Emission Segments

Data Center

2 mg

Network

10 mg

Device

22 mg

Resource Breakdown

Images

193.3 KB

CSS

131.3 KB

HTML

6.7 KB

Green Hosting Verified

Websupport.sk

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

54d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

22.04.2026

Valid Until

21.07.2026

Subject Alternative Names (10)

donfelder.czdovoleny.czpotapeckypruvodce.czpotapecskypruvodce.czskolapotapeni.czwww.donfelder.czwww.dovoleny.czwww.potapeckypruvodce.cz+2 more

SHA-256 Fingerprint

7F:B7:AB:38:8C:28:84:47:AD:11:D1:34:71:6F:23:EA:8D:6A:F4:A2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

content-encoding

⚡ Brotli(br)

content-type

text/html

date

Thu, 28 May 2026 14:53:59 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mailin1.skolapotapeni.cz

mailin2.skolapotapeni.cz

Domain Information

skolapotapeni.cz

Domain Age

25y 3m

Created

01.03.2001

Expires

01.03.2027

Last Updated

16.01.2026

Registrar

REG-ACTIVE24

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

29/100

Not Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Arial

WCAG AAA

66/100

Readability

/30

15/30

12px · LH --

Hierarchy

/20

10/20

WCAG

/25

21/25

8.45:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Arial

Body Font

Arial

Sans12px

Contrast Ratio

8.45:1

WCAG AAA (≥7:1)

Reading Comfort

~57 CPL

Optimal (45–75)

12px

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line length: ~57 chars/line (ideal 45–75 CPL).

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 8.4:1).

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 50

Color Palette

8 unique colors

Light

#010077

Primary· 40.800000000000004%

#0c128c

Accent· 29.099999999999998%

#6788b3

Secondary· 9.8%

#274a86

Accent· 7%

#a3d5e4

Accent· 5.1%

#765b80

Secondary· 4.3%

#010159

Accent· 3.2%

#081675

Accent· 0.7%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

ssl.google-analytics.com(1)

Website Identity