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kohlhammer.de

https://kohlhammer.de· First analyzed 02 May 2026· Updated 02 May 2026
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kohlhammer.de
Desktop screenshot of kohlhammer.de
Mobile screenshot of kohlhammer.de
Mobile

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Hosting Provider

rackSPEED GmbH

IP Address

93.89.4.184

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Düsseldorf, Germany

ASN

AS30962

Organization

rackSPEED GmbH

Server

LiteSpeed

Nameservers

gw01c.kohlhammer.de.ns1.de.colt.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
590 ms10%
Speed Index
767 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
328 KB
28 requests

Image Optimization

WebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
TYPO3

Technology Stack

2 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Web Servers

1
LiteSpeed

SEO Analysis

C63/100
18
6
1
Meta Tags14/15
Content7/12
Headings3/8
Technical18/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social2/5
Freshness0/4
Mobile1/4
Indexability3/3
K
kohlhammer.dekohlhammer.de

Kohlhammer: Kohlhammer | Fachbuchverlag in Stuttgart

Mit 400 neuen Büchern pro Jahr und 16 Fachzeitschriften zählt Kohlhammer aus Stuttgart zu den größten wissenschaftlichen Verlagshäusern im deutschsprachigen ...

Description truncated.
Title Length52 chars

Recommended: 50-60 chars (~320px / 580px)

Description Length162 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing H1 tag — every page should have exactly one H1

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

1 sub-sitemaps

robots.txt

11 rules

Sitemap reference found

Local SEO

Local Search Readiness

15/100
Poor
4 11 2

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

Sponsored

AI & LLM Readiness

F33/100
Bot Access
20/25
Machine Read.
5/25
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:2%
Words:212
Token eff.:Too Short
Sections/1K:14.2
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary1271w
Descriptive Headingsavg 1.7w
Canonical URL
Open Graph1/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
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
81/100
12
Passed
2
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
2/15
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.
62/100
A
41 mg
CO₂e / view
327.7 KB
Page Weight
90%
Cleaner Than
New Visitor
46 mg
vs
Returning (cached)
23 mg
Annual (10K/mo)
4.9 kg
Emission Segments
Data Center
9 mg
Network
10 mg
Device
22 mg
Resource Breakdown
JavaScript
7.4 KB
Images
187.0 KB
CSS
123.3 KB
HTML
10.0 KB
Green Hosting Not Verified
rackSPEED GmbH
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

62d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp384r1) (384 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

05.04.2026

Valid Until

04.07.2026

Subject Alternative Names (2)

kohlhammer.dewww.kohlhammer.de

SHA-256 Fingerprint

70:05:BB:69:7D:73:47:6B:D3:8E:B8:34:F8:E5:90:FE:85:53:D1:18...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc
h3=":443"; ma=2592000, h3-29=":443"; ma=2592000, h3-Q050=":4...
cache-control
🟡 0s(public, max-age=0)
content-encoding
⚡ Brotli(br)
content-language
de
content-type
text/html; charset=utf-8
date
Sat, 02 May 2026 19:31:56 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

75

SPF
DKIM
DMARC

MX Records (1)

mailgw01.kohlhammer.de

Domain Information

kohlhammer.de

Last Updated

11.12.2006

DNSSEC
Not Enabled

Privacy & Compliance

Usercentrics

Cookie Consent Banner
Usercentrics
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Usercentrics
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
70/100
Mobile Friendly5 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
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Helvetica Neue

WCAG AA
75/100
Readability
/30
23/30

16px · LH 1.31

Hierarchy
/20
11/20

2x ratio

WCAG
/25
22/25

5.74:1 min contrast

Performance
/25
19/25

System fonts

Heading Font

Helvetica Neue

Sans32px

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

5.74:1

WCAG AA (≥4.5:1)

Reading Comfort

~38 CPL

Narrow lines
32px
h1
24px
h2
16px
p

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

⚠️ Tight line spacing (1.31). Increase to 1.4–1.6 for better readability.

❌ Very complex text: Flesch score 7/100. Consider shorter sentences and simpler words.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.7:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

Flesch 7

Color Palette

6 unique colors
Light
#c1e2e7
Secondary· 70.6%
#24304a
Primary· 15.3%
#354255
Secondary· 5.4%
#17242f
Secondary· 3.4%
#955153
Secondary· 3.2%
#a0b8bd
Secondary· 2.2%

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

9 Resources

6
Scripts
3
Styles
3
Async
0
Defer

Top Script Sources

app.usercentrics.eu(2)local(2)privacy-proxy.usercentrics.eu(1)code.etracker.com(1)

Website Identity

kohlhammer.de

071178630

SO ERREICHEN SIE UNSMo-Fr: 8:00-16:00Tel: +49 (0)711 7863 0Kontakt

Location detected: 🇩🇪 Germanyvia tld
de-de

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Last analyzed: 02 May 2026 at 19:32

Historical Analysis & Change Tracking