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vdi.de

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

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Hosting Provider

CSL Computer Service Langenbach GmbH

IP Address

194.245.143.90

Site Location

🇩🇪 Germanyvia phone

Server Location

🇩🇪 Cologne, Germany

ASN

AS5517

Organization

CSL Computer Service Langenbach GmbH

Nameservers

c.ns.nrw.net.b.ns.nrw.net.a.ns.nrw.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
609 ms10%
Speed Index
792 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.1 MB
96 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
CMS
TYPO3
Infrastructure
Hosting
CSL Computer Service Langenbach GmbH

Progressive Web App

Web ManifestTheme Color

Technology Stack

8 Technologies Detected

UI Components

2
SwiperSlick Carousel

Libraries

1
jQuery

Other

1
lazysizes

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Ionicons

Analytics

1
Google Analytics

Tag Managers

1
Google Tag Manager

SEO Analysis

B71/100
18
9
1
Meta Tags12/15
Content10/12
Headings7/8
Technical21/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile3/4
Indexability3/3
V
vdi.devdi.de

Verein Deutscher Ingenieure e.V. | VDI

Rund 130.000 Ingenieurinnen und Ingenieure sind Mitglied im größten technisch-wissenschaftlichen Verein Europas, dem VDI.

Title Length38 chars

Recommended: 50-60 chars (~220px / 580px)

Description Length122 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (40/56) — critical for accessibility and SEO

10 issues found

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Crawlability

Sitemap

Type: index

12 URLs

12 sub-sitemaps

robots.txt

11 rules

Local SEO

Local Search Readiness

16/100
Poor
5 11 1

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

F36/100
Bot Access
20/25
Machine Read.
1/25
Schema Data
2/25
Citation
13/25

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
Text ratio:7%
Words:4,323
Token eff.:Poor Structure

Structured Data

1 JSON-LD
WebSite

Citation Readiness

Opening Summary100w
Descriptive Headings
Canonical URL
Open Graph2/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
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.
B
75/100
11
Passed
3
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
8/20
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
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • •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.
51/100
B
142 mg
CO₂e / view
1.1 MB
Page Weight
70%
Cleaner Than
New Visitor
162 mg
vs
Returning (cached)
81 mg
Annual (10K/mo)
17.0 kg
Emission Segments
Data Center
32 mg
Network
34 mg
Device
76 mg
Resource Breakdown
JavaScript
295.7 KB
Images
503.0 KB
CSS
227.3 KB
HTML
35.0 KB
Other
83.0 KB
Green Hosting Not Verified
CSL Computer Service Langenbach GmbH
5 recommendations
  • •Carbon footprint recommendation preview...
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B

Security Score

75%Good
Interactive

HTTPS

No WAF

171d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

30.03.2026

Valid Until

14.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.vdi.devdi.de

SHA-256 Fingerprint

D2:77:BC:89:F5:D3:85:D1:2B:B3:6B:0A:1C:16:45:AE:3F:46:A7:85...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🔴 No Cache(private, no-store, max-age=0)
content-encoding
📦 Gzip(gzip)
content-language
de-DE
content-type
text/html; charset=utf-8
cross-origin-embedder-policy
unsafe-none
cross-origin-opener-policy
same-origin
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

65

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

vdi-de.mail.protection.outlook.com

Domain Information

vdi.de

Last Updated

17.08.2017

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
Legitimate interest basis mentioned

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
76/100
Mobile Friendly25 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, minimum-scale=1
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Rajdhani + Nunito Sans

WCAG Partial
64/100
Readability
/30
18/30

15px · LH 1.60

Hierarchy
/20
17/20

3.2x ratio

WCAG
/25
16/25

1:1 min contrast

Performance
/25
13/25

2 fonts · 6 req

Heading Font

Rajdhani

Sans48px

Body Font

Nunito Sans

Sans15px

Contrast Ratio

1:1

14 issues

Reading Comfort

~38 CPL

Narrow lines
48px
h1
40px
h2
40px
h4
15px
p

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 17/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 14 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 3.2x larger than body text.

Buy on MyFontsFlesch 17

Color Palette

8 unique colors
12.63:1 AAA Light
#ffffff
Primary· 34.900000000000006%
#333333
Text· 10.2%
#0b152b
Primary· 8.2%
#1a120f
Primary· 7.9%
#25377b
Accent· 2.2%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

1
CookiebotMid-Market

Cookie consent and privacy compliance tools

2

Categories

3

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Well-developed marketing technology stack

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Scripts & Styles

30 Resources

20
Scripts
10
Styles
4
Async
0
Defer

Top Script Sources

local(15)consent.cookiebot.eu(2)gstatic.com(1)googletagmanager.com(1)google.com(1)

Website Identity

Verein Deutscher Ingenieure e.V.

[email protected]
+4921162140
www.vdi.de/
Location detected: 🇩🇪 Germanyvia phone
📧 Microsoft 365de

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Last analyzed: 26 Apr 2026 at 09:35

Historical Analysis & Change Tracking