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volker-quaschning.de

https://volker-quaschning.de· First analyzed 17 May 2026· Updated 17 May 2026
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volker-quaschning.de
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Mobile

Sponsored

Hosting Provider

IONOS (1&1)
ionos.com

IP Address

217.160.0.64

Site Location

🇩🇪 Berlin, Germanyvia schema_nap

Server Location

🇩🇪 Essen, Germany

ASN

AS8560

Organization

Ionos Inf

Server

Apache

Nameservers

ns1080.ui-dns.de.ns1080.ui-dns.com.ns1080.ui-dns.biz.ns1080.ui-dns.org.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
439 ms10%
Speed Index
571 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.8 MB
33 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
IONOS (1&1)

Technology Stack

6 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Libraries

1
jQuery

Icon Libraries

1
Font Awesome

Analytics

1
Matomo

Web Servers

1
Apache

SEO Analysis

A85/100
23
6
0
Meta Tags13/15
Content12/12
Headings7/8
Technical22/25
E-E-A-T7/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
V
volker-quaschning.devolker-quaschning.de

Volker Quaschning: Erneuerbare Energien und Klimaschutz

Heute ist ein guter Tag, um die Welt zu retten - Die Klimakrise ist die größte Bedrohung für unsere Welt, wie wir sie kennen. Wollen wir die Lebensgrundlagen...

Description truncated.
Title Length55 chars

Recommended: 50-60 chars (~333px / 580px)

Description Length464 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    368 URLs

    robots.txt

    8 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    22/100
    Needs Work
    6 14

    Sponsored

    AI & LLM Readiness

    D58/100
    Bot Access
    20/25
    Machine Read.
    10/25
    Schema Data
    12/25
    Citation
    16/25

    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
    nav
    Text ratio:19%
    Words:2,790
    Token eff.:Optimal
    Sections/1K:6.8
    Depth:1/5

    Structured Data

    4 JSON-LD
    Article×1.2Person×1.3Organization×1.1WebSite
    sameAs entity links

    Citation Readiness

    Opening Summary85w
    Descriptive Headingsavg 2.4w
    Canonical URL
    Open Graph3/3
    Twitter Card1/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    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.
    B
    75/100
    10
    Passed
    3
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    15/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    10/15
    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.
    2 recommendations
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    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.
    53/100
    C
    190 mg
    CO₂e / view
    1.8 MB
    Page Weight
    50%
    Cleaner Than
    New Visitor
    217 mg
    vs
    Returning (cached)
    108 mg
    Annual (10K/mo)
    22.7 kg
    Emission Segments
    Data Center
    9 mg
    Network
    56 mg
    Device
    125 mg
    Resource Breakdown
    JavaScript
    114.1 KB
    Images
    1.6 MB
    CSS
    54.8 KB
    HTML
    21.3 KB
    Green Hosting Verified
    IONOS SE
    GWF Verified
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    21%Critical
    Interactive

    HTTPS

    No WAF

    154d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Sectigo Limited

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    07.04.2026

    Valid Until

    18.10.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    *.volker-quaschning.devolker-quaschning.de

    SHA-256 Fingerprint

    64:4F:35:8E:5D:30:F9:CB:75:F5:3E:D6:E2:44:5C:29:D2:1A:EA:63...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=utf-8
    date
    Sun, 17 May 2026 02:36:00 GMT
    server
    Apache
    x-ws-origin
    available
    x-ws-ratelimit-limit
    1000
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    65

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (2)

    mx00.ionos.de
    mx01.ionos.de

    Domain Information

    volker-quaschning.de

    Last Updated

    11.09.2018

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    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.
    B
    72/100
    Mobile Friendly6 breakpoints
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    -apple-system

    WCAG Partial
    74/100
    Readability
    /30
    25/30

    16px · LH 1.50

    Hierarchy
    /20
    15/20

    2.5x ratio

    WCAG
    /25
    14/25

    2.12:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    -apple-system

    Sans40px

    Body Font

    -apple-system

    Sans16px

    Contrast Ratio

    2.12:1

    23 issues

    Reading Comfort

    ~34 CPL

    Narrow lines
    40px
    h1
    32px
    h2
    28px
    h3
    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 29/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 23 elements below WCAG AA threshold (min 2.1:1).

    ⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    Flesch 29

    Color Palette

    11 unique colors
    2.98:1 Fail Light
    #ffffff
    Background· 55.20000000000001%
    #9a958a
    Other· 5.4%
    #a1bf2d
    Primary· 7.6000000000000005%
    #191b20
    Text· 6.3%
    #f2fbd6
    Accent· 5.6%
    #4d718c
    Secondary· 5.6%
    #364351
    Secondary· 5.4%
    #e0e2d2
    Secondary· 4.3%

    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

    11 Resources

    6
    Scripts
    5
    Styles
    1
    Async
    4
    Defer

    Top Script Sources

    local(5)volker-quaschning.de(1)

    Website Identity

    Prof. Dr.-Ing. Volker Quaschning

    Person

    Professor für Regenerative Energiesysteme an der HTW Berlin, Experte für Erneuerbare Energien, Energiewende und Klimaschutz, Buchautor und öffentlicher Redner.

    www.volker-quaschning.de/

    Wilhelminenhofstraße 75A, Berlin

    12459, Berlin

    DE

    Location detected: 🇩🇪 Germany, Berlinvia schema_nap
    de

    Sponsored

    Last analyzed: 17 May 2026 at 02:36

    Historical Analysis & Change Tracking