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dzhk.de

https://dzhk.de· First analyzed 24 May 2026· Updated 24 May 2026
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dzhk.de
Desktop screenshot of dzhk.de
Mobile screenshot of dzhk.de
Mobile

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Hosting Provider

Artfiles New Media GmbH

IP Address

212.53.214.48

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Geesthacht, Germany

ASN

AS8893

Organization

Artfiles New Media GmbH

Server

Apache

Nameservers

ns2.dzhk.de.lvps87-230-95-44.dedicated.hosteurope.de.

Performance

98

Core Web Vitals

Weight

First Contentful Paint
926 ms10%
Speed Index
1.2 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.1 MB
45 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
CMS
TYPO3
Infrastructure
Hosting
Artfiles New Media GmbH

Technology Stack

7 Technologies Detected

Fonts

2
Adobe Fonts (Typekit)Adobe Fonts

Analytics

2
Google Analytics
Google Analytics 4

Libraries

1
jQuery

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Apache

SEO Analysis

C65/100
17
6
3
Meta Tags10/15
Content11/12
Headings3/8
Technical19/21
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social2/5
Freshness2/4
Mobile4/4
Indexability3/3
D
dzhk.dedzhk.de

Deutsches Zentrum für Herz-Kreislauf-Forschung e.V.

No description available for this page.

Title Length51 chars

Recommended: 50-60 chars (~310px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (13/16) — critical for accessibility and SEO

9 issues found

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Local SEO

Local Search Readiness

15/100
Poor
4 12 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

D48/100
Bot Access
20/25
Machine Read.
11/25
Schema Data
3/25
Citation
14/25

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
data-nosnippet

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
navheader/footer
Text ratio:10%
Words:1,174
Token eff.:Optimal
Sections/1K:17.9
Depth:2/5

Structured Data

Microdata
Article×1.2microdata

Citation Readiness

Opening Summary491w
Descriptive Headingsavg 4.2w
Canonical URL
Open Graph1/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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.
C
68/100
10
Passed
4
Critical
1
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
5/15
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
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 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.
71/100
B
111 mg
CO₂e / view
1.1 MB
Page Weight
70%
Cleaner Than
New Visitor
127 mg
vs
Returning (cached)
63 mg
Annual (10K/mo)
13.3 kg
Emission Segments
Data Center
5 mg
Network
33 mg
Device
73 mg
Resource Breakdown
JavaScript
145.3 KB
Images
839.4 KB
CSS
96.6 KB
HTML
15.8 KB
Green Hosting Verified
Artfiles New Media GmbH
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

31%Critical
Interactive

HTTPS

No WAF

76d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

10.05.2026

Valid Until

08.08.2026

Subject Alternative Names (3)

dzhk.depreserve-synch.dzhk.dew2.dzhk.de

SHA-256 Fingerprint

86:45:5D:26:DF:68:D4:69:13:66:C9:8A:AE:04:F2:6A:73:09:61:C8...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🔴 No Cache(private, no-store, max-age=0)
content-encoding
📦 Gzip(gzip)
content-language
de-DE
content-length
15898
content-type
text/html; charset=utf-8
date
Sun, 24 May 2026 04:41:51 GMT
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

98

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

dzhk-de.mail.protection.outlook.com

Domain Information

dzhk.de

Last Updated

30.01.2026

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
Privacy policy page linked

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.
C
61/100
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.
Viewport
width=device-width, initial-scale=1, shrink-to-fit=no
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

filson-pro

WCAG Partial
58/100
Readability
/30
24/30

16px · LH 1.50

Hierarchy
/20
8/20
WCAG
/25
10/25

1:1 min contrast

Performance
/25
16/25

1 font

Heading Font

filson-pro

Sans

Body Font

filson-pro

Sans16px

Contrast Ratio

1:1

11 issues

Reading Comfort

~38 CPL

Narrow lines
48px
h2
16px
p

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 11 elements below WCAG AA threshold (min 1.0:1).

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

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

AAdobe FontsBuy on MyFontsFlesch 0

Color Palette

8 unique colors
5.74:1 AA Dark
#666666
Other· 50.400000000000006%
#ffffff
Background· 17.6%
#4d1018
Accent· 13.2%
#382c2b
Secondary· 6.9%
#9f052c
Primary· 4%
#613130
Secondary· 1.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

21 Resources

12
Scripts
9
Styles
0
Async
1
Defer

Top Script Sources

local(9)dzhk.de(1)cdn.jsdelivr.net(1)cdn.datatables.net(1)

Website Identity

dzhk.de

Location detected: 🇩🇪 Germanyvia tld
📧 Microsoft 365de

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Last analyzed: 24 May 2026 at 04:42

Historical Analysis & Change Tracking