holocaust.cz

https://holocaust.cz· First analyzed 17 May 2026· Updated 17 May 2026

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holocaust.cz

Mobile

Sponsored

Hosting Provider

Nux s.r.o

IP Address

80.95.253.80

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS12767

Organization

Nux s.r.o

Server

OpenResty

Nameservers

ns2.nux.eu.ns3.nux.cloud.ns1.nux.cz.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

480 ms10%

Speed Index

624 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

323 KB

62 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Nux s.r.o

Technology Stack

5 Technologies Detected

Analytics

CSS Frameworks

Web Servers

SEO Analysis

C61/100

Meta Tags8/15

Content11/12

Headings3/8

Technical16/25

E-E-A-T3/7

Images4/7

Links4/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

holocaust.czholocaust.cz

Holocaust

Portál holocaust.cz představuje obsáhlý a unikátní zdroj informací k tématu holocaustu, rasismu a antisemitismu.

Title Length9 chars

Recommended: 50-60 chars (~53px / 580px)

Description Length112 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

4 URLs

4 sub-sitemaps

robots.txt

12 rules

Sitemap reference found

Local SEO

Local Search Readiness

6/100

Poor

2 14 2

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

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AI & LLM Readiness

F33/100

Bot Access

20/25

Machine Read.

5/25

Schema Data

0/25

Citation

8/25

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:6%

Words:3,634

Token eff.:Good

Sections/1K:4.4

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 3.5w

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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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.

49/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

7/20

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

Forms & Inputs

2/15

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.

4 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.

52/100

A+

40 mg

CO₂e / view

323.2 KB

Page Weight

90%

Cleaner Than

New Visitor

46 mg

Returning (cached)

23 mg

Annual (10K/mo)

4.8 kg

Emission Segments

Data Center

9 mg

Network

10 mg

Device

22 mg

Resource Breakdown

JavaScript

78.4 KB

Images

161.1 KB

CSS

40.2 KB

HTML

43.5 KB

Green Hosting Not Verified

Nux s.r.o

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

46%Poor

Interactive

HTTPS

No WAF

74d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp384r1) (384 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.05.2026

Valid Until

30.07.2026

Subject Alternative Names (3)

c.holocaust.czholocaust.czwww.holocaust.cz

SHA-256 Fingerprint

02:38:1F:6A:86:DA:6F:3F:8A:A2:AF:04:6D:2F:A4:05:C0:85:C1:D9...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 3 Hours(public, max-age=10800)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Sun, 17 May 2026 03:52:58 GMT

expires

Sun, 17 May 2026 09:52:58 GMT

last-modified

Sat, 23 Aug 2025 09:17:09 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (3)

mx1.nux.cz

mx2.nux.cz

mx3.nux.cz

Domain Information

holocaust.cz

Domain Age

25y 8m

Created

31.08.2000

Expires

30.08.2026

Last Updated

03.04.2018

Registrar

REG-INTERNET-CZ

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.

37/100

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.

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Verdana + Georgia

WCAG Partial

61/100

Readability

/30

25/30

16px · LH 1.44

Hierarchy

/20

8/20

WCAG

/25

14/25

3.47:1 min contrast

Performance

/25

14/25

2 fonts

Heading Font

Verdana

Sans

Body Font

Georgia

Serif16px

Contrast Ratio

3.47:1

5 issues

Reading Comfort

~69 CPL

Optimal (45–75)

12px

16px

Minor Second

Scale

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.44 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~69 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 25/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 3.5:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

Buy on MyFontsFlesch 25

Color Palette

5 unique colors

16.1:1 AAA Light

#ffffff

Background· 55.4%

#212121

Other· 13.599999999999998%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Matomo (Piwik)Mid-Market

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

matomo.nux.cz(1)darujme.cz(1)google-analytics.com(1)holocaust.cz(1)

Website Identity

holocaust.cz

education@terezinstudies.cz

25 years old

Location detected: 🇨🇿 Czech Republicvia tld

REG-INTERNET-CZcs

Social Profiles

Facebook

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Last analyzed: 17 May 2026 at 03:53

Historical Analysis & Change Tracking