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marum.de

https://marum.de· First analyzed 15 May 2026· Updated 15 May 2026
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marum.de
Desktop screenshot of marum.de
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Hosting Provider

Universitaet Bremen

IP Address

134.102.234.63

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Bremen, Germany

ASN

AS680

Organization

Universitaet Bremen

Server

Apache

Nameservers

ines.zfn.uni-bremen.de.deneb.dfn.de.ns.informatik.uni-bremen.de.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
746 ms10%
Speed Index
970 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
21.5 MB
130 requests

Image Optimization

WebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Universitaet Bremen

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Analytics

1
Matomo

Web Servers

1
Apache

SEO Analysis

D56/100
16
8
2
Meta Tags10/15
Content3/12
Headings3/8
Technical15/25
E-E-A-T3/7
Images5/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
M
marum.demarum.de

MARUM – Dem Meer auf den Grund gehen!

Das MARUM entschlüsselt mit modernsten Methoden und eingebunden in internationale Projekte die Rolle des Ozeans im System Erde – insbesondere in Hinblick auf...

Description truncated.
Title Length37 chars

Recommended: 50-60 chars (~241px / 580px)

Description Length404 chars

Recommended: 120-160 chars

Issues (2)

  • • Very thin content (8 words). Search engines need substantial content for ranking.
  • • Missing H1 tag — every page should have exactly one H1

10 issues found

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Crawlability

Sitemap
robots.txt

1330 rules

Allows all crawlers

Local SEO

Local Search Readiness

10/100
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

F27/100
Bot Access
16/25
Machine Read.
7/25
Schema Data
0/25
Citation
4/25

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
Text ratio:1%
Words:2,198
Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
AI readiness recommendation preview...
Upgrade to view recommendations

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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
66/100
8
Passed
4
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
6/20
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
1/15
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.
16/100
F
2.72 g
CO₂e / view
21.5 MB
Page Weight
5%
Cleaner Than
New Visitor
3.11 g
vs
Returning (cached)
1.55 g
Annual (10K/mo)
326.4 kg
Emission Segments
Data Center
607 mg
Network
653 mg
Device
1.46 g
Resource Breakdown
JavaScript
164.4 KB
Images
20.9 MB
CSS
364.6 KB
HTML
13.8 KB
Other
19.9 KB
Green Hosting Not Verified
Universitaet Bremen
6 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A+

Security Score

98%Excellent
Static / Informational

HTTPS

No WAF

47d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

02.04.2026

Valid Until

01.07.2026

Subject Alternative Names (6)

additor24.marum.demarum.detheoceanfloor.dewww-new.marum.dewww.marum.dewww.theoceanfloor.de

SHA-256 Fingerprint

06:A6:6E:7C:18:E8:53:75:4B:9A:1B:54:31:5F:7B:B7:04:A5:76:AD...

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HTTP Headers

Developer Console

accept-ranges
bytes
cache-control
🟡 16 Hours(max-age=57922)
content-encoding
📦 Gzip(gzip)
content-length
13796
content-security-policy
default-src 'self' blob: data: *.marum.de *.youtube.com http...
content-type
text/html; charset=utf-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

75

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mail2.marum.de
mail1.marum.de

Domain Information

marum.de

Last Updated

26.03.2026

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Notice (WP)

Cookie Consent Banner
Cookie Notice (WP)
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Cookie Notice (WP)
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.
D
57/100
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
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

SharpSans

WCAG Partial
64/100
Readability
/30
24/30

18px · LH 1.50

Hierarchy
/20
8/20
WCAG
/25
17/25

1.01:1 min contrast

Performance
/25
15/25

1 font · 2 req

Heading Font

SharpSans

Sans

Body Font

SharpSans

Sans18px

Contrast Ratio

1.01:1

28 issues

Reading Comfort

~42 CPL

Narrow lines
40px
h2
36px
h3
27px
h4
18px
p

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

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

⚠️ Partial contrast: 28 elements below WCAG AA threshold (min 1.0:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

Buy on MyFontsFlesch 0

Color Palette

12 unique colors
20.27:1 AAA Light
#ffffff
Background· 23%
#060605
Text· 6.4%
#7f969d
Primary· 16.3%
#6e8691
Secondary· 13.4%
#413735
Secondary· 6.9%
#53748a
Secondary· 6%
#868565
Secondary· 5.4%
#1d3444
Secondary· 4.6%

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

10 Resources

8
Scripts
2
Styles
1
Async
1
Defer

Top Script Sources

local(4)frontend(2)stats.marum.de(1)assets(1)

Website Identity

marum.de

Location detected: 🇩🇪 Germanyvia tld
de

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Last analyzed: 15 May 2026 at 03:44

Historical Analysis & Change Tracking