lorentzcenter.nl

https://lorentzcenter.nl· First analyzed 17 May 2026· Updated 17 May 2026

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lorentzcenter.nl

Mobile

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Hosting Provider

Transip NL VPS Pod5 Ams4

IP Address

136.144.186.95

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 De Waal, Netherlands

ASN

AS20857

Organization

Transip NL VPS Pod5 Ams4

Server

Apache

Nameservers

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

Performance

Core Web Vitals

Weight

First Contentful Paint

1.7 s10%

Speed Index

2.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.8 MB

64 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Transip NL VPS Pod5 Ams4

Technology Stack

10 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Hotjar

UI Components

Slick Carousel Lightbox

CSS Frameworks

Libraries

Icon Libraries

Web Servers

SEO Analysis

D53/100

Meta Tags10/15

Content6/12

Headings3/8

Technical13/25

E-E-A-T3/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

lorentzcenter.nllorentzcenter.nl

Center for Scientific Workshops in All Disciplines - Home

No description available for this page.

Title Length57 chars

Recommended: 50-60 chars (~337px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (27/27) — critical for accessibility and SEO

11 issues found

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Crawlability

Sitemap

robots.txt

8 rules

Local SEO

Local Search Readiness

3/100

Poor

1 14 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

F28/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

Citation

6/25

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

nav

Text ratio:4%

Words:182

Token eff.:Too Short

Sections/1K:33

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary10w

Descriptive Headingsavg 2w

Canonical URL

Open Graph0/3

Twitter Card0/3

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.

50/100

Passed

Critical

Warnings

Images & Alt Text

5/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

9/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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.

5 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.

27/100

290 mg

CO₂e / view

2.8 MB

Page Weight

30%

Cleaner Than

New Visitor

331 mg

Returning (cached)

165 mg

Annual (10K/mo)

34.7 kg

Emission Segments

Data Center

14 mg

Network

85 mg

Device

190 mg

Resource Breakdown

JavaScript

993.5 KB

Images

1021.0 KB

CSS

828.7 KB

HTML

22.7 KB

Other

681 B

Green Hosting Verified

Transip

GWF Verified

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Interactive

HTTPS

No WAF

58d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

15.04.2026

Valid Until

14.07.2026

Subject Alternative Names (3)

lc.congrezzo.nllorentzcenter.nlwww.lorentzcenter.nl

SHA-256 Fingerprint

6E:A8:A3:77:5B:6D:E9:1C:1C:F8:12:7F:D5:2A:A7:F2:64:EC:1E:EE...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(private, must-revalidate, max-age=0, no-store, no-cache, pos...)

connection

Keep-Alive

content-security-policy

frame-ancestors 'self';

content-type

text/html; charset=UTF-8

date

Sun, 17 May 2026 05:27:43 GMT

expires

Mon, 26 Jul 1997 05:00:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

lorentzcenter-nl.h-v1.mx.microsoft

Domain Information

lorentzcenter.nl

Domain Age

21y 2m

Created

22.03.2005

Last Updated

19.12.2024

Registrar

team.blue nl B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer 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.

65/100

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...

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Typography & Readability

MyriadProRegular

WCAG Partial

58/100

Readability

/30

14/30

13px · LH 1.43

Hierarchy

/20

8/20

WCAG

/25

17/25

4.48:1 min contrast

Performance

/25

19/25

System fonts

Heading Font

MyriadProRegular

Sans

Body Font

MyriadProRegular

Sans13px

Contrast Ratio

4.48:1

10 issues

Reading Comfort

~32 CPL

Narrow lines

30px

24px

13px

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

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

⚠️ Partial contrast: 10 elements below WCAG AA threshold (min 4.5:1).

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

✅ System fonts: Zero font loading delay — best possible LCP impact.

Buy on MyFontsFlesch 0

Color Palette

13 unique colors

21:1 AAA Light

#ffffff

Background· 34.2%

#000000

Text· 7.5%

#feed01

Primary· 13.7%

#ebf3ef

Secondary· 9.1%

#362f1f

Primary· 7.1%

#cbcdbc

Secondary· 6.3%

#635429

Secondary· 5.7%

#788267

Secondary· 5.4%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

HotjarMid-Market

User behavior and product analytics

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Scripts & Styles

25 Resources

Scripts

Styles

Async

Defer

Top Script Sources

lorentzcenter.nl(5)googletagmanager.com(2)..(2)local(2)google-analytics.com(1)

Website Identity

lorentzcenter.nl

21 years old

Location detected: 🇳🇱 Netherlandsvia tld

team.blue nl B.V.en

Social Profiles

Facebook Instagram LinkedIn Bluesky

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Last analyzed: 17 May 2026 at 05:27

Historical Analysis & Change Tracking