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clio-online.de

https://clio-online.de· First analyzed 14 May 2026· Updated 14 May 2026
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clio-online.de
Desktop screenshot of clio-online.de
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Mobile

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Hosting Provider

Humboldt-Universitaet zu Berlin

IP Address

141.20.85.4

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Berlin, Germany

ASN

AS680

Organization

Humboldt-Universitaet zu Berlin

Nameservers

hpcom.rz.hu-berlin.de.suncom.rz.hu-berlin.de.buffy.cms.hu-berlin.de.dns-3.dfn.de.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
511 ms10%
Speed Index
664 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
339 KB
9 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Humboldt-Universitaet zu Berlin

Technology Stack

1 Technologies Detected

CSS Frameworks

1
Tailwind CSS

SEO Analysis

C63/100
16
7
2
Meta Tags13/15
Content12/12
Headings3/8
Technical16/25
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social1/5
Freshness0/4
Mobile4/4
Indexability3/3
C
clio-online.declio-online.de

Clio-online - Fachportal Geschichte & Geschichtswissenschaft

Clio-online ist ein Portal für die Geschichtswissenschaft und bietet Zugang zu Fachinformationen und Kommunikationsdienste, wie Suchmaschinen und Datenbanken...

Description truncated.
Title Length60 chars

Recommended: 50-60 chars (~362px / 580px)

Description Length237 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (2/2) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

762 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.

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AI & LLM Readiness

D41/100
Bot Access
16/25
Machine Read.
13/25
Schema Data
0/25
Citation
12/25

AI Bot Access

8/14 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:651
Token eff.:Optimal
Sections/1K:6.1
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary54w
Descriptive Headingsavg 3.2w
Canonical URL
Open Graph0/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
AI readiness recommendation preview...
Upgrade to view recommendations

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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.
C
65/100
11
Passed
3
Critical
1
Warnings
Images & Alt Text
5/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
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.
3 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.
68/100
A
42 mg
CO₂e / view
339.3 KB
Page Weight
90%
Cleaner Than
New Visitor
48 mg
vs
Returning (cached)
24 mg
Annual (10K/mo)
5.0 kg
Emission Segments
Data Center
9 mg
Network
10 mg
Device
23 mg
Resource Breakdown
JavaScript
223.7 KB
Images
17.8 KB
CSS
89.3 KB
HTML
8.5 KB
Green Hosting Not Verified
Humboldt-Universitaet zu Berlin
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A+

Security Score

98%Excellent
Static / Informational

HTTPS

No WAF

35d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (3072 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

20.03.2026

Valid Until

18.06.2026

Subject Alternative Names (9)

beta.clio-online.declio-online.dehro.clio-online.dewww.clio-online.dewww.clio-online.euwww.clio-online.infowww.clio-online.netwww.clio-online.org+1 more

SHA-256 Fingerprint

43:32:AF:05:84:A4:FC:44:65:2D:1B:D9:33:03:E5:E8:E0:FB:A5:A7...

Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🟡 3 Hours(max-age=10800, public)
content-encoding
📦 Gzip(gzip)
content-language
de
content-length
8432
content-security-policy
script-src 'self' *.clio-online.de *.paypal.com *.paypalobje...
content-type
text/html; charset=UTF-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

20

SPF
DKIM
DMARC

MX Records (1)

lists.clio-online.de

Domain Information

clio-online.de

Last Updated

24.05.2018

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.
C
60/100
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=1.0
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

graublau_webregular

WCAG Partial
64/100
Readability
/30
22/30

14px · LH 1.40

Hierarchy
/20
8/20
WCAG
/25
19/25

4.18:1 min contrast

Performance
/25
15/25

2 fonts · 2 req

Heading Font

graublau_webregular

Sans

Body Font

graublau_webregular

Sans14px

Contrast Ratio

4.18:1

1 issue

Reading Comfort

~48 CPL

Optimal (45–75)
16px
h2
14px
p

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~48 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 4.2:1).

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

Buy on MyFontsFlesch 0

Color Palette

6 unique colors
12.46:1 AAA Light
#ffffff
Background· 68.10000000000001%
#343433
Other· 3.9%
#851418
Primary· 17.5%
#8d2528
Accent· 0.6%

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

3 Resources

1
Scripts
2
Styles
0
Async
0
Defer

Top Script Sources

local(1)

Website Identity

clio-online.de

clio.redaktion@geschichte.hu-berlin.de
Location detected: 🇩🇪 Germanyvia tld
de

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Last analyzed: 14 May 2026 at 04:55

Historical Analysis & Change Tracking