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selbstlernserver.de

https://selbstlernserver.de· First analyzed 11 May 2026· Updated 11 May 2026
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selbstlernserver.de
Desktop screenshot of selbstlernserver.de
Mobile screenshot of selbstlernserver.de
Mobile

Sponsored

Hosting Provider

Hetzner
hetzner.com

IP Address

95.216.152.144

Site Location

🇩🇪 Germanyvia tld

Server Location

🇫🇮 Helsinki, Finland

ASN

AS24940

Organization

Hetzner Online GmbH

Server

Nginx

Nameservers

ns2.desec.org.ns1.desec.io.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
494 ms10%
Speed Index
642 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
186 KB
20 requests

Image Optimization

Lazy LoadWebP
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Hetzner

Technology Stack

4 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Fonts

1
Google Fonts

Web Servers

1
Nginx

SEO Analysis

D56/100
16
10
0
Meta Tags7/15
Content9/12
Headings5/8
Technical13/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social2/5
Freshness0/4
Mobile4/4
Indexability3/3
S
selbstlernserver.deselbstlernserver.de

Selbstlernserver

Further Away From Business Weiter Weg vom Geschäft Farther Away From Busines No Comercial Internet

Title Length16 chars

Recommended: 50-60 chars (~94px / 580px)

Description Length98 chars

Recommended: 120-160 chars

Issues (0)

    10 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    4 URLs

    robots.txt

    2 rules

    Local SEO

    Local Search Readiness

    0/100
    Poor
    15 2

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

    Sponsored

    AI & LLM Readiness

    F39/100
    Bot Access
    20/25
    Machine Read.
    12/25
    Schema Data
    0/25
    Citation
    7/25

    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:12%
    Words:317
    Token eff.:Optimal
    Sections/1K:9.5
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary55w
    Descriptive Headingsavg 3.3w
    Canonical URL
    Open Graph1/3
    Twitter Card2/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (10)
    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.
    C
    63/100
    7
    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
    10/20
    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
    4/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    3 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.
    80/100
    A+
    19 mg
    CO₂e / view
    186.0 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    22 mg
    vs
    Returning (cached)
    11 mg
    Annual (10K/mo)
    2.3 kg
    Emission Segments
    Data Center
    <0.001 g
    Network
    6 mg
    Device
    12 mg
    Resource Breakdown
    JavaScript
    8.2 KB
    Images
    33.6 KB
    CSS
    137.8 KB
    Fonts
    1.0 KB
    HTML
    5.3 KB
    Green Hosting Verified
    Hetzner Online GmbH
    GWF Verified
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    C

    Security Score

    61%Fair
    Interactive

    HTTPS

    No WAF

    71d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    23.04.2026

    Valid Until

    22.07.2026

    Subject Alternative Names (1)

    selbstlernserver.de

    SHA-256 Fingerprint

    6E:6F:ED:86:F5:B9:A0:7A:14:AF:7F:95:EE:63:FF:8F:EB:2F:2B:DD...

    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
    date
    Mon, 11 May 2026 17:13:23 GMT
    etag
    W/"65e1f613-4776"
    last-modified
    Fri, 01 Mar 2024 15:36:51 GMT
    referrer-policy
    origin-when-cross-origin
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    70

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (1)

    selbstlernserver.de

    Domain Information

    selbstlernserver.de

    Last Updated

    24.09.2023

    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.
    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, minimum-scale=1
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Jost

    WCAG Partial
    69/100
    Readability
    /30
    26/30

    19px · LH 1.50

    Hierarchy
    /20
    13/20

    3.83x ratio

    WCAG
    /25
    10/25

    1:1 min contrast

    Performance
    /25
    20/25

    1 font · 2 req

    Heading Font

    Jost

    Sans74px

    Body Font

    Jost

    Sans19px

    Contrast Ratio

    1:1

    17 issues

    Reading Comfort

    ~36 CPL

    Narrow lines
    74px
    h1
    48px
    h3
    32px
    h4
    19px
    p

    ✅ Excellent readability: 19px body text is ideal for all devices.

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

    ⚠️ Hard to read: Flesch score 46/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 17 elements below WCAG AA threshold (min 1.0:1).

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

    ✅ Strong hierarchy: Headlines are 3.8x larger than body text.

    GGoogle FontsFlesch 46

    Color Palette

    11 unique colors
    Light
    #ffffff
    Background· 26.900000000000002%
    #050000
    Primary· 18.9%
    #440f03
    Accent· 8.6%
    #7e3708
    Accent· 7.7%
    #722103
    Accent· 6.3%
    #6d4e2f
    Secondary· 6.3%
    #a55317
    Accent· 6%
    #b69279
    Secondary· 5.6%

    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

    Sponsored

    Scripts & Styles

    12 Resources

    2
    Scripts
    10
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    assets(2)

    Website Identity

    selbstlernserver.de

    Location detected: 🇩🇪 Germanyvia tld

    Sponsored

    Last analyzed: 11 May 2026 at 17:13

    Historical Analysis & Change Tracking