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gbv.de

https://gbv.de· First analyzed 26 Apr 2026· Updated 26 Apr 2026
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gbv.de
Desktop screenshot of gbv.de
Mobile screenshot of gbv.de
Mobile

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Hosting Provider

Gemeinsamer Bibiliotheksverbund, Verbundzentrale in Goettingen

IP Address

193.174.240.199

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Göttingen, Germany

ASN

AS680

Organization

Gemeinsamer Bibiliotheksverbund, Verbundzentrale in Goettingen

Server

Nginx

Nameservers

inets1.gbv.de.deneb.dfn.de.inets2.gbv.de.

Performance

81

Core Web Vitals

Weight

First Contentful Paint
2.1 s10%
Speed Index
2.7 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
472 KB
25 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Gemeinsamer Bibiliotheksverbund, Verbundzentrale in Goettingen

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

Languages

1
Pythonv.

SEO Analysis

C64/100
18
5
1
Meta Tags7/15
Content9/12
Headings6/8
Technical18/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile3/4
Indexability3/3
G
gbv.degbv.de

Willkommen — Verbundzentrale des GBV

No description available for this page.

Title Length36 chars

Recommended: 50-60 chars (~225px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

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

6 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

43 rules

Sitemap reference found

Local SEO

Local Search Readiness

3/100
Poor
1 14 2

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

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AI & LLM Readiness

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

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:5%
Words:202
Token eff.:Too Short
Depth:2/5

Structured Data

Microdata

Citation Readiness

Opening Summary35w
Descriptive Headings
Canonical URL
Open Graph3/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
AI readiness recommendation preview...
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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
13
Passed
1
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
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.
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.
52/100
A
58 mg
CO₂e / view
471.7 KB
Page Weight
90%
Cleaner Than
New Visitor
67 mg
vs
Returning (cached)
33 mg
Annual (10K/mo)
7.0 kg
Emission Segments
Data Center
13 mg
Network
14 mg
Device
31 mg
Resource Breakdown
JavaScript
248.9 KB
Images
158.7 KB
CSS
52.3 KB
HTML
7.6 KB
Other
4.2 KB
Green Hosting Not Verified
Gemeinsamer Bibiliotheksverbund, Verbundzentrale in Goettingen
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

76%Good
Interactive

HTTPS

No WAF

220d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

03.12.2025

Valid Until

03.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.gbv.de

SHA-256 Fingerprint

46:99:97:48:1E:CF:75:1F:7F:A0:84:B6:45:64:90:44:FC:06:CD:07...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection
keep-alive
content-encoding
📦 Gzip(gzip)
content-language
de
content-security-policy
default-src 'self' data:; img-src data: *; style-src 'self' ...
content-type
text/html;charset=utf-8
date
Sun, 26 Apr 2026 14:21:15 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

45

SPF
DKIM
DMARC

MX Records (3)

a1234.mx.srv.dfn.de
c1234.mx.srv.dfn.de
b1234.mx.srv.dfn.de

Domain Information

gbv.de

Last Updated

05.06.2013

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 Friendly2 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
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Verdana

WCAG Partial
59/100
Readability
/30
19/30

13px · LH 1.43

Hierarchy
/20
13/20

1.54x ratio · ✓ H1→H6

WCAG
/25
13/25

1:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Verdana

Sans20px

Body Font

Verdana

Sans13px

Contrast Ratio

1:1

15 issues

Reading Comfort

~49 CPL

Optimal (45–75)
20px
h1
13px
p

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~49 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 8/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 1.0:1).

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

Buy on MyFontsFlesch 8

Color Palette

7 unique colors
Light
#ffffff
Background· 62.1%
#557fbb
Primary· 15.2%
#b3bbc2
Secondary· 5.7%
#8893a0
Secondary· 4.2%
#445267
Secondary· 3.2%

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

13 Resources

6
Scripts
7
Styles
1
Async
0
Defer

Top Script Sources

gbv.de(6)

Website Identity

gbv.de

Location detected: 🇩🇪 Germanyvia tld
de

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Last analyzed: 26 Apr 2026 at 14:21

Historical Analysis & Change Tracking