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zkm.de

https://zkm.de· First analyzed 25 Apr 2026· Updated 25 Apr 2026
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zkm.de
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Mobile

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Hosting Provider

ZKM Karlsruhe

IP Address

193.197.168.188

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Marxzell, Germany

ASN

AS553

Organization

ZKM Karlsruhe

Server

Nginx

CDN

Varnish

Nameservers

dns3.belwue.de.dns.zkm.de.infoblox.zkm.de.dns1.belwue.de.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
479 ms10%
Speed Index
623 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
4 MB
34 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupalv10

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Analytics

1
Matomo

Web Servers

1
Nginxv1.18.0

SEO Analysis

B75/100
21
5
0
Meta Tags12/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
Z
zkm.dezkm.de

Zentrum für Kunst und Medien | ZKM

Das ZKM Karlsruhe ist eine weltweit einzigartige Kulturinstitution – Erleben Sie vielfältige Ausstellungen und Veranstaltungen rund um das Thema Medienkunst.

Title Length34 chars

Recommended: 50-60 chars (~214px / 580px)

Description Length157 chars

Recommended: 120-160 chars

Issues (0)

    5 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    53 rules

    Local SEO

    Local Search Readiness

    14/100
    Poor
    4 12 2

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

    Sponsored

    AI & LLM Readiness

    D43/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    0/25
    Citation
    12/25

    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
    navheader/footer
    Text ratio:5%
    Words:712
    Token eff.:Optimal
    Sections/1K:63.2
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary14w
    Descriptive Headingsavg 3.3w
    Canonical URL
    Open Graph2/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    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.
    A
    83/100
    14
    Passed
    2
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    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
    7/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 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.
    29/100
    F
    501 mg
    CO₂e / view
    4.0 MB
    Page Weight
    15%
    Cleaner Than
    New Visitor
    573 mg
    vs
    Returning (cached)
    287 mg
    Annual (10K/mo)
    60.2 kg
    Emission Segments
    Data Center
    112 mg
    Network
    120 mg
    Device
    269 mg
    Resource Breakdown
    JavaScript
    87.1 KB
    Images
    2.9 MB
    CSS
    942.4 KB
    HTML
    14.9 KB
    Green Hosting Not Verified
    ZKM Karlsruhe
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    41%Poor
    Interactive

    HTTPS

    No WAF

    249d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    Hellenic Academic and Research Institutions CA

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    30.12.2025

    Valid Until

    30.12.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    zkm.dewww.zkm.de

    SHA-256 Fingerprint

    2A:69:9E:17:EF:F1:B4:F9:88:29:99:76:29:F1:27:CE:CB:0F:39:1E...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    access-control-allow-origin
    *
    age
    0
    cache-control
    🔴 No Cache(must-revalidate, no-cache, private)
    connection
    keep-alive
    content-encoding
    📦 Gzip(gzip)
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    65

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (4)

    c1431.mx.srv.dfn.de
    b1431.mx.srv.dfn.de
    a1431.mx.srv.dfn.de
    fortimail.zkm.de

    Domain Information

    zkm.de

    Last Updated

    07.11.2016

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    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
    62/100
    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=1.0
    1 recommendation
    • •Mobile compatibility recommendation preview...
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    Typography & Readability

    ZKMSerendipity

    WCAG AAA
    79/100
    Readability
    /30
    20/30

    18px · LH 1.50

    Hierarchy
    /20
    15/20

    3.5x ratio

    WCAG
    /25
    24/25

    12.63:1 min contrast

    Performance
    /25
    20/25

    1 font · 2 req

    Heading Font

    ZKMSerendipity

    Sans64px

    Body Font

    ZKMSerendipity

    Sans18px

    Contrast Ratio

    12.63:1

    WCAG AAA (≥7:1)

    Reading Comfort

    ~131 CPL

    Too wide
    64px
    h1
    64px
    h2
    32px
    h3
    18px
    p

    ✅ Excellent readability: 18px body text is ideal for all devices.

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

    ❌ Very long lines: ~131 chars/line causes eye strain. Add max-width constraint.

    ⚠️ Hard to read: Flesch score 39/100. Simplify sentences for wider reach.

    ✅ WCAG AAA contrast: All text meets 7:1 ratio (min 12.6:1).

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

    Buy on MyFontsFlesch 39

    Color Palette

    7 unique colors
    11.64:1 AAA Light
    #f6f6f6
    Background· 59.9%
    #36332e
    Text· 8.7%
    #0d1823
    Primary· 11.1%
    #a08493
    Secondary· 6.4%
    #704458
    Secondary· 3.3%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Matomo (Piwik)Mid-Market
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    4 Resources

    2
    Scripts
    2
    Styles
    1
    Async
    1
    Defer

    Top Script Sources

    analytics.zkm.de(1)local(1)

    Website Identity

    zkm.de

    info@zkm.de
    Location detected: 🇩🇪 Germanyvia tld
    de

    Sponsored

    Last analyzed: 25 Apr 2026 at 09:25

    Historical Analysis & Change Tracking