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cornelsen.de

https://cornelsen.de· First analyzed 28 Apr 2026· Updated 28 Apr 2026
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cornelsen.de
Desktop screenshot of cornelsen.de
Mobile screenshot of cornelsen.de
Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

3.64.81.57

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS16509

Organization

AWS EC2 (eu-central-1)

Server

Nginx

Nameservers

ns-771.awsdns-32.net.ns-1277.awsdns-31.org.ns-1757.awsdns-27.co.uk.ns-264.awsdns-33.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
642 ms10%
Speed Index
835 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3 MB
76 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Amazon Web Services (AWS)

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

11 Technologies Detected

Analytics

4
Google Analytics
Google Analytics 4
Facebook PixelMicrosoft Clarity

Advertising

3
Google AdsPinterest TagMicrosoft Advertising

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

B70/100
21
7
0
Meta Tags9/15
Content8/12
Headings6/8
Technical22/25
E-E-A-T2/7
Images3/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
C
cornelsen.decornelsen.de

Cornelsen Verlag | Cornelsen

Der Cornelsen Verlag bietet Bildungsmedien wie Schulbücher, Arbeitshefte und Materialien für den Unterricht für Lernende und Lehrende.

Title Length28 chars

Recommended: 50-60 chars (~164px / 580px)

Description Length135 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    8 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    15/100
    Poor
    4 12 1

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

    Sponsored

    AI & LLM Readiness

    D50/100
    Bot Access
    19/25
    Machine Read.
    10/25
    Schema Data
    8/25
    Citation
    13/25

    AI Bot Access

    12/14 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:4%
    Words:1,322
    Token eff.:Optimal
    Depth:2/5

    Structured Data

    2 JSON-LD
    Organization×1.1WebSiteBreadcrumbListSearchAction
    sameAs entity links

    Citation Readiness

    Opening Summary20w
    Descriptive Headings
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    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
    78/100
    12
    Passed
    4
    Critical
    1
    Warnings
    Images & Alt Text
    15/20
    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
    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
    11/15
    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...
    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.
    47/100
    E
    307 mg
    CO₂e / view
    3.0 MB
    Page Weight
    30%
    Cleaner Than
    New Visitor
    351 mg
    vs
    Returning (cached)
    175 mg
    Annual (10K/mo)
    36.8 kg
    Emission Segments
    Data Center
    15 mg
    Network
    90 mg
    Device
    202 mg
    Resource Breakdown
    JavaScript
    630.5 KB
    Images
    1.5 MB
    CSS
    876.7 KB
    HTML
    31.8 KB
    Other
    5.0 KB
    Green Hosting Verified
    Amazon Web Services (AWS)
    Provider Match
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Interactive

    HTTPS

    No WAF

    192d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Amazon

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    08.10.2025

    Valid Until

    06.11.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (3)

    cornelsen.de*.cornelsen.de*.mein.cornelsen.de

    SHA-256 Fingerprint

    C9:49:22:C0:AA:F3:38:FF:6B:98:28:DA:9B:5A:DE:3C:05:49:A3:4B...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    content-encoding
    📦 Gzip(gzip)
    content-security-policy
    frame-ancestors 'self'; report-uri /__csp-report
    content-type
    text/html;charset=UTF-8
    date
    Tue, 28 Apr 2026 10:47:21 GMT
    referrer-policy
    strict-origin-when-cross-origin
    server
    nginx
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    93

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (1)

    cornelsen-de.mail.protection.outlook.com

    Domain Information

    cornelsen.de

    Last Updated

    03.07.2025

    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.
    A
    81/100
    Mobile Friendly15 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=1.0
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    CV Source Sans

    WCAG AA
    63/100
    Readability
    /30
    14/30

    15px · LH 1.27

    Hierarchy
    /20
    14/20

    2x ratio

    WCAG
    /25
    21/25

    5.32:1 min contrast

    Performance
    /25
    14/25

    1 font · 8 req

    Heading Font

    CV Source Sans

    Sans30px

    Body Font

    CV Source Sans

    Sans15px

    Contrast Ratio

    5.32:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~38 CPL

    Narrow lines
    30px
    h1
    30px
    h2
    24px
    h3
    24px
    h4
    15px
    p

    ⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

    ⚠️ Tight line spacing (1.27). Increase to 1.4–1.6 for better readability.

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

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.3:1).

    ⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ Strong hierarchy: Headlines are 2.0x larger than body text.

    Buy on MyFontsFlesch 0

    Color Palette

    5 unique colors
    6.69:1 AA Dark
    #5c5c5c
    Other· 51.60000000000001%
    #ffffff
    Primary· 36.4%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    18 Resources

    14
    Scripts
    4
    Styles
    2
    Async
    1
    Defer

    Top Script Sources

    cornelsen.de(12)mcw0nd.cornelsen.de(1)l.ecn-ldr.de(1)

    Website Identity

    Cornelsen

    Der Cornelsen Verlag bietet Bildungsmedien wie Schulbücher, Arbeitshefte und Materialien für den Unterricht für Lernende und Lehrende.

    www.cornelsen.de/
    Location detected: 🇩🇪 Germanyvia tld
    📧 Microsoft 365de

    Sponsored

    Last analyzed: 28 Apr 2026 at 10:47

    Historical Analysis & Change Tracking