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co2-rechner.de

https://co2-rechner.de· First analyzed 07 May 2026· Updated 07 May 2026
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co2-rechner.de
Desktop screenshot of co2-rechner.de
Mobile screenshot of co2-rechner.de
Mobile

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Hosting Provider

domainfactory GmbH

IP Address

134.119.86.56

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Cologne, Germany

ASN

AS34011

Organization

domainfactory GmbH

Server

Nginx

Nameservers

ns81.domaincontrol.com.ns82.domaincontrol.com.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
774 ms10%
Speed Index
1.0 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
959 KB
51 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Tailwind CSS
Infrastructure
Hosting
domainfactory GmbH

Technology Stack

5 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Frameworks

1
Alpine.js

Analytics

1
Matomo

Web Servers

1
Nginx

SEO Analysis

C60/100
15
10
0
Meta Tags8/15
Content12/12
Headings6/8
Technical14/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
C
co2-rechner.deco2-rechner.de

CO2-Rechner des Umweltbundesamtes

CO2-Rechner des Umweltbundesamtes

Title Length33 chars

Recommended: 50-60 chars (~213px / 580px)

Description Length33 chars

Recommended: 120-160 chars

Issues (0)

    10 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    90 rules

    Local SEO

    Local Search Readiness

    5/100
    Poor
    2 13 2

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

    Sponsored

    AI & LLM Readiness

    D40/100
    Bot Access
    20/25
    Machine Read.
    12/25
    Schema Data
    0/25
    Citation
    8/25

    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:26%
    Words:2,823
    Token eff.:Optimal
    Sections/1K:9.6
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary32w
    Descriptive Headingsavg 4.4w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    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.
    B
    78/100
    11
    Passed
    5
    Critical
    0
    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
    9/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    9/15
    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
    B
    119 mg
    CO₂e / view
    959.0 KB
    Page Weight
    70%
    Cleaner Than
    New Visitor
    136 mg
    vs
    Returning (cached)
    68 mg
    Annual (10K/mo)
    14.2 kg
    Emission Segments
    Data Center
    27 mg
    Network
    29 mg
    Device
    64 mg
    Resource Breakdown
    JavaScript
    301.7 KB
    Images
    284.6 KB
    CSS
    354.7 KB
    HTML
    15.6 KB
    Other
    2.3 KB
    Green Hosting Not Verified
    domainfactory GmbH
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Static / Informational

    HTTPS

    No WAF

    199d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Starfield Technologies, Inc.

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    11.11.2025

    Valid Until

    23.11.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    *.co2-rechner.deco2-rechner.de

    SHA-256 Fingerprint

    3C:D4:2A:4B:A4:39:77:51:7E:D1:8C:6C:AB:8C:FB:87:51:A0:D4:C5...

    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
    Thu, 07 May 2026 21:18:36 GMT
    server
    nginx
    vary
    Accept-Encoding
    x-cache-status
    EXPIRED
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (1)

    mxlb.ispgateway.de

    Domain Information

    co2-rechner.de

    Last Updated

    06.10.2025

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Notice (WP)

    Cookie Consent Banner
    Cookie Notice (WP)
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookie Notice (WP)
    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
    69/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    MetaSerifComp-Medium + MetaCompPro-Normal

    WCAG Partial
    69/100
    Readability
    /30
    25/30

    16px · LH 1.50

    Hierarchy
    /20
    18/20

    4x ratio · ✓ H1→H6

    WCAG
    /25
    13/25

    1:1 min contrast

    Performance
    /25
    13/25

    2 fonts · 4 req

    Heading Font

    MetaSerifComp-Medium

    Serif64px

    Body Font

    MetaCompPro-Normal

    Sans16px

    Contrast Ratio

    1:1

    5 issues

    Reading Comfort

    Serif Headlines + Sans Body

    left aligned
    64px
    h1
    32px
    h2
    28px
    h3
    24px
    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 34/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 4.0x larger than body text.

    Buy on MyFontsFlesch 34

    Color Palette

    9 unique colors
    5.81:1 AA Dark
    #4f4e4d
    Other· 24.7%
    #d8d8d4
    Other· 5.9%
    #0d0d08
    Secondary· 18.700000000000003%
    #1f2312
    Primary· 18.4%
    #6b735c
    Secondary· 7.5%
    #9aa98d
    Secondary· 6.8%
    #3f422b
    Secondary· 6.7%
    #36311e
    Secondary· 6.2%

    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

    25 Resources

    18
    Scripts
    7
    Styles
    1
    Async
    16
    Defer

    Top Script Sources

    ..(17)piwik.klimaktiv.de(1)

    Website Identity

    co2-rechner.de

    [email protected]
    Location detected: 🇩🇪 Germanyvia tld
    de

    Sponsored

    Last analyzed: 07 May 2026 at 21:18

    Historical Analysis & Change Tracking

    co2-rechner.de Technology Stack - Built With Alpine.js, Bootstrap, Tailwind CSS, Matomo, Nginx | StackOptic | StackOptic