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jck.nl

https://jck.nl· First analyzed 04 May 2026· Updated 04 May 2026
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jck.nl
Desktop screenshot of jck.nl
Mobile screenshot of jck.nl
Mobile

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Hosting Provider

Rootnet Managed Servers BIT

IP Address

185.173.20.179

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Nijmegen, The Netherlands

ASN

AS12859

Server

Nginx

Nameservers

ns1.dnsshop.org.ns2.dnsshop.eu.ns3.dnsshop.nl.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
441 ms10%
Speed Index
573 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
786 KB
91 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Hybrid
⚙️ SSR
Frontend
Framework
Nuxt.js
Infrastructure
Hosting
Rootnet Managed Servers BIT

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Meta Frameworks

1
Nuxt.js

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

B74/100
23
4
1
Meta Tags15/15
Content5/12
Headings8/8
Technical23/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social2/5
Freshness0/4
Mobile4/4
Indexability3/3
J
jck.nljck.nl

Joodse Cultuur op vier locaties | Joods Cultureel Kwartier

Joods Cultureel Kwartier. Vier eeuwen Joodse cultuur op vier locaties op één vierkante kilometer. Bezoek het JCK in Amsterdam en ontdek meer.

Title Length58 chars

Recommended: 50-60 chars (~344px / 580px)

Description Length141 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (22/23) — critical for accessibility and SEO

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,253 URLs

robots.txt

5 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

11/100
Poor
3 12 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

D44/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
5/25
Citation
11/25

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:1%
Words:751
Token eff.:Optimal
Sections/1K:1.3
Depth:1/5

Structured Data

1 JSON-LD
FAQPage×1.5

Citation Readiness

Opening Summary24w
Descriptive Headingsavg 4w
Canonical URL
Open Graph0/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
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
14
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
17/20
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
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
7/15
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.
68/100
B
79 mg
CO₂e / view
785.8 KB
Page Weight
80%
Cleaner Than
New Visitor
91 mg
vs
Returning (cached)
45 mg
Annual (10K/mo)
9.5 kg
Emission Segments
Data Center
4 mg
Network
23 mg
Device
52 mg
Resource Breakdown
JavaScript
410.7 KB
Images
126.3 KB
CSS
117.1 KB
HTML
131.4 KB
Other
388 B
Green Hosting Verified
Rootnet
GWF Verified
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

51%Poor
Interactive

HTTPS

No WAF

83d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

27.04.2026

Valid Until

26.07.2026

Subject Alternative Names (1)

jck.nl

SHA-256 Fingerprint

67:B1:B0:E1:26:B2:6D:B8:39:DA:AB:A1:63:D4:D6:7B:35:2D:53:9F...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding
📦 Gzip(gzip)
content-type
text/html;charset=utf-8
date
Mon, 04 May 2026 10:27:29 GMT
referrer-policy
same-origin
server
nginx
strict-transport-security
max-age=63072000
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

98

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

jck-nl.mail.protection.outlook.com

Domain Information

jck.nl

Domain Age
26y 4m

Created

31.12.1999

Last Updated

10.12.2021

Registrar

White Label Domain

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
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.
A
80/100
Mobile Friendly160 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
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Criativa Sans

WCAG Partial
80/100
Readability
/30
25/30

18px · LH 1.50

Hierarchy
/20
17/20

4.89x ratio · ✓ H1→H6

WCAG
/25
18/25

1:1 min contrast

Performance
/25
20/25

1 font · 3 req

Heading Font

Criativa Sans

Sans88px

Body Font

Criativa Sans

Sans18px

Contrast Ratio

1:1

36 issues

Reading Comfort

~38 CPL

Narrow lines
88px
h1
52px
h2
32px
h3
24px
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 29/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 36 elements below WCAG AA threshold (min 1.0:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 4.9x larger than body text.

Buy on MyFontsFluid Type (rem)Flesch 29

Color Palette

6 unique colors
Light
#ffffff
Primary· 25.799999999999997%
#000fa0
Primary· 66.19999999999999%
#6f76bb
Secondary· 2.1%
#d2d6e8
Secondary· 2.1%
#a4aad2
Secondary· 2%
#2c35a3
Accent· 1.7%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

1

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

13 Resources

3
Scripts
10
Styles
2
Async
0
Defer

Top Script Sources

googletagmanager.com(2)local(1)

Website Identity

jck.nl

26 years old
Location detected: 🇳🇱 Netherlandsvia tld
White Label Domain📧 Microsoft 365nl

Social Profiles

FacebookInstagram

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Last analyzed: 04 May 2026 at 10:27

Historical Analysis & Change Tracking