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luebbe.de

https://luebbe.de· First analyzed 03 May 2026· Updated 03 May 2026
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luebbe.de
Desktop screenshot of luebbe.de
Mobile screenshot of luebbe.de
Mobile

Sponsored

Hosting Provider

GFI Informationsdesign GmbH

IP Address

46.20.39.153

Site Location

🇩🇪 Köln, Germanyvia schema_nap

Server Location

🇩🇪 Düsseldorf, Germany

ASN

AS24961

Organization

GFI Informationsdesign GmbH

Server

Vercel

Nameservers

ns1.kiagdomain.de.ns2.kiagdomain.de.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
513 ms10%
Speed Index
667 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.6 MB
83 requests

Image Optimization

Lazy LoadWebPResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

JAMstack
🔀 Hybrid
Decoupled
Frontend
Framework
Next.js
Styling
Tailwind CSS
API
Data Source
Headless CMS
Contentful
Infrastructure
Platform
Vercel
CDN
Vercel Image

Detected API Sources

https://images.ctfassets.net/d...https://images.ctfassets.net/d...

Technology Stack

11 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
FullStory

Payments

3
StripePayPalKlarna

Meta Frameworks

1
Next.js

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Advertising

1
Google Ads

Platforms

1
Vercel

SEO Analysis

A83/100
25
4
0
Meta Tags14/15
Content10/12
Headings6/8
Technical23/25
E-E-A-T2/7
Images7/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
L
luebbe.deluebbe.de

Bastei Lübbe AG | Bücher, Romane, eBooks, Hörbücher

Lass dich begeistern von Bastei Lübbe, einem der größten Verlagsgruppen Deutschlands. Entdecke Welt-Bestseller-Autor:innen und ihre Bücher, eBooks und Hörbüc...

Description truncated.
Title Length51 chars

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

Description Length162 chars

Recommended: 120-160 chars

Issues (0)

    4 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    6 URLs

    6 sub-sitemaps

    robots.txt

    9 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    23/100
    Needs Work
    6 14

    Sponsored

    AI & LLM Readiness

    D52/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    3/25
    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:1%
    Words:1,323
    Token eff.:Optimal
    Depth:1/5

    Structured Data

    1 JSON-LD
    Organization×1.1
    sameAs entity links

    Citation Readiness

    Opening Summary53w
    Descriptive Headingsavg 6.7w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (6)
    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
    1
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    18/20
    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
    13/15
    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
    C
    200 mg
    CO₂e / view
    1.6 MB
    Page Weight
    60%
    Cleaner Than
    New Visitor
    229 mg
    vs
    Returning (cached)
    114 mg
    Annual (10K/mo)
    24.0 kg
    Emission Segments
    Data Center
    45 mg
    Network
    48 mg
    Device
    107 mg
    Resource Breakdown
    JavaScript
    852.0 KB
    Images
    37.0 KB
    CSS
    28.0 KB
    Fonts
    173.6 KB
    HTML
    168.8 KB
    Other
    358.7 KB
    Green Hosting Not Verified
    GFI Informationsdesign GmbH
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    40%Poor
    Critical / Transactional

    HTTPS

    No WAF

    68d

    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

    11.04.2026

    Valid Until

    10.07.2026

    Subject Alternative Names (1)

    bastei-luebbe.de

    SHA-256 Fingerprint

    73:48:18:7B:4D:01:3E:99:BC:E3:F1:C7:7C:0F:D2:ED:11:E3:7A:6A...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    age
    9139
    cache-control
    🟡 0s(public, max-age=0, must-revalidate)
    content-encoding
    ⚡ Brotli(br)
    content-security-policy
    default-src 'self' *.ccm19.de; script-src 'self' 'unsafe-eva...
    content-type
    text/html; charset=utf-8
    date
    Sun, 03 May 2026 05:20:53 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    90

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (1)

    relay.mail.sec-provider.de

    Domain Information

    luebbe.de

    Last Updated

    10.08.2022

    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.
    B
    71/100
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    ryker + base

    WCAG Partial
    71/100
    Readability
    /30
    22/30

    16px · LH 1.50

    Hierarchy
    /20
    14/20

    2.49x ratio

    WCAG
    /25
    17/25

    1:1 min contrast

    Performance
    /25
    18/25

    2 fonts · 4 req

    Heading Font

    ryker

    Sans40px

    Body Font

    base

    Sans16px

    Contrast Ratio

    1:1

    22 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    40px
    h1
    40px
    h2
    33px
    h3
    14px
    h4
    16px
    p

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

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

    ⚠️ Hard to read: Flesch score 49/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 22 elements below WCAG AA threshold (min 1.0:1).

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

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

    Buy on MyFontsFlesch 49

    Color Palette

    7 unique colors
    5.26:1 AA Dark
    #42413f
    Text· 22.999999999999996%
    #b6bcb4
    Other· 5.1%
    #94d2c7
    Primary· 47.199999999999996%
    #f6f2ed
    Primary· 14.1%
    #77a49f
    Secondary· 4.5%
    #8d2d85
    Accent· 3.6%
    #c2e0d9
    Secondary· 2.4%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google AnalyticsFree
    Google Tag ManagerFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    24 Resources

    20
    Scripts
    4
    Styles
    20
    Async
    0
    Defer

    Top Script Sources

    local(19)googletagmanager.com(1)

    Website Identity

    Bastei Lübbe

    Bastei Lübbe

    Organization

    Bastei Lübbe ist der größte unabhängige Publikumsverlag Deutschlands. 1953 gegründet, sind wir heute Heimat (inter-) nationaler Bestsellerautor:innen und mit unseren 13 starken Verlagsmarken am deutschsprachigen Markt erfolgreich.

    bastei-luebbe.de

    Schanzenstraße 6-20, Köln

    51063, Köln

    DE

    Location detected: 🇩🇪 Germany, Kölnvia schema_nap
    deEst. 1953

    Sponsored

    Last analyzed: 03 May 2026 at 07:53

    Historical Analysis & Change Tracking