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gei.de

https://gei.de· First analyzed 12 May 2026· Updated 12 May 2026
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gei.de
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Mobile

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Hosting Provider

Georg-Eckert-Institut fuer internationale Schulbuchforschung

IP Address

193.175.255.92

Site Location

🇩🇪 Germanyvia schema_nap

Server Location

🇩🇪 Hamm, Germany

ASN

AS680

Organization

Georg-Eckert-Institut fuer internationale Schulbuchforschung

Server

Nginx

Nameservers

ns08.domaincontrol.com.ns07.domaincontrol.com.

Performance

94

Core Web Vitals

Weight

First Contentful Paint
1.2 s10%
Speed Index
1.6 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3.1 MB
28 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
TYPO3

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Analytics

1
Matomo

Web Servers

1
Nginx

SEO Analysis

A82/100
26
4
1
Meta Tags7/15
Content12/12
Headings8/8
Technical24/25
E-E-A-T2/7
Images6/7
Links5/5
URL5/5
Social4/5
Freshness2/4
Mobile4/4
Indexability3/3
G
gei.degei.de

Leibniz-Institut für Bildungsmedien | Georg-Eckert-Institut - GEI.de

No description available for this page.

Title Length68 chars

Recommended: 50-60 chars (~403px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing meta description — important for click-through rates in SERPs

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

5 sub-sitemaps

robots.txt

10 rules

Sitemap reference found

Local SEO

Local Search Readiness

31/100
Needs Work
8 13

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AI & LLM Readiness

D51/100
Bot Access
20/25
Machine Read.
13/25
Schema Data
3/25
Citation
15/25

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:8%
Words:747
Token eff.:Optimal
Sections/1K:21.4
Depth:2/5

Structured Data

1 JSON-LD
Organization×1.1
sameAs entity links

Citation Readiness

Opening Summary16w
Descriptive Headingsavg 4.9w
Canonical URL
Open Graph2/3
Twitter Card2/3
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.
A
87/100
14
Passed
0
Critical
1
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
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
13/15
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.
1 recommendation
  • •Accessibility recommendation preview...
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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.
26/100
F
396 mg
CO₂e / view
3.1 MB
Page Weight
30%
Cleaner Than
New Visitor
453 mg
vs
Returning (cached)
226 mg
Annual (10K/mo)
47.5 kg
Emission Segments
Data Center
88 mg
Network
95 mg
Device
213 mg
Resource Breakdown
JavaScript
123.7 KB
Images
2.0 MB
CSS
895.7 KB
HTML
85.4 KB
Green Hosting Not Verified
Georg-Eckert-Institut fuer internationale Schulbuchforschung
5 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

21%Critical
Interactive

HTTPS

No WAF

86d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

08.05.2026

Valid Until

06.08.2026

Subject Alternative Names (20)

amudarya.gei.debibliothek.gei.dedeuframat.dedeuframat.gei.deeuropabilder.gei.deeuropabilder.orggei.deleibniz-gei.de+12 more

SHA-256 Fingerprint

97:6F:22:CB:76:C3:2D:27:5B:EE:6B:5B:6D:41:43:4D:B7:1F:F5:06...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-cache, must-revalidate)
content-language
de
content-length
87122
content-type
text/html; charset=utf-8
date
Tue, 12 May 2026 05:02:03 GMT
etag
"ceb03c198b4fac57d97ac9623b1c6acf"
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

45

SPF
DKIM
DMARC

MX Records (3)

a2781.mx.srv.dfn.de
b2781.mx.srv.dfn.de
c2781.mx.srv.dfn.de

Domain Information

gei.de

Last Updated

30.01.2024

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.
C
69/100
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=1.0001, minimum-scale=1.0001, maximum-scale=2.0001, user-scalable=yes
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Asap Condensed + Source Serif 4

WCAG AAA
78/100
Readability
/30
20/30

16px · LH 1.90

Hierarchy
/20
18/20

4.1x ratio · ✓ H1→H6

WCAG
/25
24/25

7.16:1 min contrast

Performance
/25
16/25

2 fonts · 7 req

Heading Font

Asap Condensed

Sans66px

Body Font

Source Serif 4

Serif16px

Contrast Ratio

7.16:1

WCAG AAA (≥7:1)

Reading Comfort

~33 CPL

Narrow lines
66px
h1
42px
h2
26px
h3
16px
p

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

⚠️ Wide line spacing (1.90). 1.4–1.6 is optimal for body text.

❌ Very complex text: Flesch score 2/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 7.2:1).

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

✅ Strong hierarchy: Headlines are 4.1x larger than body text.

Buy on MyFontsFlesch 2

Color Palette

8 unique colors
4:1 AA Large Light
#7f7f7f
Other· 43.2%
#ffffff
Primary· 22.900000000000002%
#0b1216
Secondary· 9.2%
#84975e
Secondary· 3.4%

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

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Scripts & Styles

6 Resources

2
Scripts
4
Styles
0
Async
0
Defer

Top Script Sources

local(2)

Website Identity

Leibniz-Institut für Bildungsmedien | Georg-Eckert-Institut

Leibniz-Institut für Bildungsmedien | Georg-Eckert-Institut

Organization
www.gei.de

Freisestr. 1

38118, Braunschweig

DE

Location detected: 🇩🇪 Germanyvia schema_nap
de-DE

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Last analyzed: 12 May 2026 at 05:02

Historical Analysis & Change Tracking