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luf.nl

https://luf.nl· First analyzed 04 Jun 2026· Updated 04 Jun 2026
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luf.nl
Desktop screenshot of luf.nl
Mobile screenshot of luf.nl
Mobile

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Hosting Provider

Universiteit Leiden

IP Address

132.229.29.70

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Oegstgeest, Netherlands

ASN

AS1103

Organization

Universiteit Leiden

Nameservers

ns3.surfnet.nl.ns1.surfnet.nl.ns2.surfnet.nl.

Performance

98

Core Web Vitals

Weight

First Contentful Paint
878 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
27 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Universiteit Leiden

Technology Stack

3 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Libraries

1
jQuery

SEO Analysis

C66/100
18
5
1
Meta Tags10/15
Content10/12
Headings8/8
Technical14/21
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social4/5
Freshness2/4
Mobile4/4
Indexability3/3
L
luf.nlluf.nl

Home - Leids Universiteits Fonds

Het Leids Universiteits Fonds is hét fonds van de Universiteit Leiden. Dankzij steun van alumni en andere schenkers werken wetenschappers aan baanbrekend ond...

Description truncated.
Title Length32 chars

Recommended: 50-60 chars (~192px / 580px)

Description Length317 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (9/10) — critical for accessibility and SEO

6 issues found

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Local SEO

Local Search Readiness

6/100
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

D42/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
15/25

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:9%
Words:245
Token eff.:Too Short
Sections/1K:16.3
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary48w
Descriptive Headingsavg 1.5w
Canonical URL
Open Graph2/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
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
85/100
12
Passed
2
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
18/20
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.

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.
38/100
C
159 mg
CO₂e / view
1.3 MB
Page Weight
70%
Cleaner Than
New Visitor
182 mg
vs
Returning (cached)
91 mg
Annual (10K/mo)
19.1 kg
Emission Segments
Data Center
36 mg
Network
38 mg
Device
85 mg
Resource Breakdown
JavaScript
37.4 KB
Images
1.0 MB
CSS
212.9 KB
HTML
4.4 KB
Green Hosting Not Verified
Universiteit Leiden
5 recommendations
  • •Carbon footprint recommendation preview...
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A

Security Score

81%Very Good
Interactive

HTTPS

No WAF

75d

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

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

18.08.2025

Valid Until

18.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

cms.universiteitleiden.nlwww.bibliotheek.universiteitleiden.nlorganisatiegids.universiteitleiden.nlwww.luf.nlwww.medewerkers.universiteitleiden.nlbibliotheek.universiteitleiden.nlmedewerkers.universiteitleiden.nlluf.nl+12 more

SHA-256 Fingerprint

85:90:A2:14:6C:CF:D2:E8:D5:E3:05:04:E0:02:84:21:91:2A:51:35...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-methods
GET
access-control-allow-origin
*
access-control-max-age
3600
content-encoding
📦 Gzip(gzip)
content-security-policy
frame-ancestors 'self' https://leidenuniv.libwizard.com http...
content-type
text/html;charset=UTF-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

78

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

Domain Information

luf.nl

Domain Age
27y 7m

Created

03.11.1998

Last Updated

19.12.2024

Registrar

team.blue nl B.V.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected

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
65/100
Mobile Friendly
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
3 recommendations
  • •Mobile compatibility recommendation preview...
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Typography & Readability

vestula

WCAG Partial
64/100
Readability
/30
18/30

20px · LH 1.38

Hierarchy
/20
17/20

2x ratio

WCAG
/25
14/25

2.81:1 min contrast

Performance
/25
15/25

2 fonts · 3 req

Heading Font

vestula

Sans40px

Body Font

vestula

Sans20px

Contrast Ratio

2.81:1

7 issues

Reading Comfort

~38 CPL

Narrow lines
40px
h1
28px
h2
20px
p

✅ Excellent readability: 20px body text is ideal for all devices.

⚠️ Tight line spacing (1.38). Increase to 1.4–1.6 for better readability.

❌ Very complex text: Flesch score 13/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 7 elements below WCAG AA threshold (min 2.8:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

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

Buy on MyFontsFlesch 13

Color Palette

11 unique colors
14.06:1 AAA Light
#ffffff
Background· 40.9%
#292c2e
Text· 5.7%
#b7c4d0
Primary· 8.7%
#618caf
Secondary· 8.6%
#516a8a
Secondary· 7%
#dae0e4
Secondary· 6.1%
#6c415f
Secondary· 5.3%
#7dadd1
Secondary· 5.2%

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

8
Scripts
1
Styles
8
Async
1
Defer

Top Script Sources

local(7)googletagmanager.com(1)

Website Identity

luf.nl

27 years old
Location detected: 🇳🇱 Netherlandsvia tld
team.blue nl B.V.nl

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Last analyzed: 04 Jun 2026 at 14:54

Historical Analysis & Change Tracking

luf.nl Technology Stack - Built With jQuery, Google Analytics, Google Analytics 4 | StackOptic | StackOptic