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esb.nu

https://esb.nu· First analyzed 12 May 2026· Updated 12 May 2026
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esb.nu
Desktop screenshot of esb.nu
Mobile screenshot of esb.nu
Mobile

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Hosting Provider

Tilaa B.V.

IP Address

84.22.97.151

Site Location

🇳🇱 Netherlandsvia ip

Server Location

🇳🇱 Woerden, Netherlands

ASN

AS196752

Server

Nginx

Nameservers

ns1.transip.nl.ns0.transip.net.ns2.transip.eu.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
447 ms10%
Speed Index
581 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
757 KB
45 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPress
cms
ESBv0Custom
by Level Level
View Theme

Technology Stack

11 Technologies Detected

Plugins

6
Woocommerce Memberships
Mailcamp
WooCommerce
Download Monitor
Duracelltomi Google Tag Manager
Yoast SEO

Libraries

1
jQueryv3.7.1

CSS Frameworks

1
Tailwind CSS

Analytics

1
Google Analytics

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

B71/100
21
8
2
Meta Tags4/15
Content10/12
Headings8/8
Technical24/25
E-E-A-T2/7
Images3/7
Links2/5
URL5/5
Social3/5
Freshness4/4
Mobile3/4
Indexability3/3
E
esb.nuesb.nu

Homepagina - ESB

No description available for this page.

Title Length16 chars

Recommended: 50-60 chars (~99px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Most images missing alt text (51/57) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

47 URLs

47 sub-sitemaps

robots.txt

11 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

14/100
Poor
4 13

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.
7/25
Schema Data
7/25
Citation
10/25

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
Text ratio:6%
Words:2,900
Token eff.:Optimal

Structured Data

4 JSON-LD
Organization×1.1WebSiteBreadcrumbListSearchAction

Citation Readiness

Opening Summary220w
Descriptive Headings
Canonical URL
Open Graph1/3
Twitter Card1/3
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.
A
87/100
16
Passed
1
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
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
14/15
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.
1 recommendation
  • •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
77 mg
CO₂e / view
757.0 KB
Page Weight
80%
Cleaner Than
New Visitor
87 mg
vs
Returning (cached)
44 mg
Annual (10K/mo)
9.2 kg
Emission Segments
Data Center
4 mg
Network
23 mg
Device
50 mg
Resource Breakdown
JavaScript
177.1 KB
Images
335.7 KB
CSS
216.5 KB
HTML
27.3 KB
Other
320 B
Green Hosting Verified
Tilaa
GWF Verified
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

81%Very Good
Interactive

HTTPS

No WAF

48d

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

31.03.2026

Valid Until

29.06.2026

Subject Alternative Names (5)

auteurs.esb.nueconomie.nlesb.nuwww.economie.nlwww.esb.nu

SHA-256 Fingerprint

D2:A5:EF:DF:CF:9E:C2:DE:01:EF:AD:91:77:AC:7A:8D:BC:B7:AC:94...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

content-encoding
📦 Gzip(gzip)
content-security-policy
default-src https: data: blob:; script-src 'unsafe-inline' '...
content-type
text/html; charset=UTF-8
date
Tue, 12 May 2026 05:03:43 GMT
link
<https://esb.nu/wp-json/>; rel="https://api.w.org/", <https:...
referrer-policy
strict-origin-when-cross-origin
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

esb-nu.mail.protection.outlook.com

Domain Information

esb.nu

DNSSEC
Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner
Cookiebot
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Cookiebot
Privacy policy page linked
Data Protection Officer mentioned
Legitimate interest basis 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.
B
78/100
Mobile Friendly25 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

Libre Caslon Text + ProximaNovaRegular

WCAG Partial
78/100
Readability
/30
20/30

18px · LH 1.44

Hierarchy
/20
20/20

2.67x ratio · ✓ H1→H6

WCAG
/25
18/25

3.72:1 min contrast

Performance
/25
20/25

2 fonts · 3 req

Heading Font

Libre Caslon Text

Sans48px

Body Font

ProximaNovaRegular

Sans18px

Contrast Ratio

3.72:1

9 issues

Reading Comfort

~37 CPL

Narrow lines
48px
h1
28px
h2
24px
h3
18px
p

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

✅ Optimal line spacing: 1.44 ratio (ideal range 1.4–1.6).

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

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 3.7:1).

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

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

Buy on MyFontsFluid Type (rem)Flesch 0

Color Palette

7 unique colors
Light
#ffffff
Background· 68.39999999999999%
#73abc7
Secondary· 8.4%
#e7f3fb
Primary· 0%
#2a5875
Primary· 5.6%
#a1b3be
Secondary· 5.1%
#adcad8
Secondary· 5%
#708d99
Secondary· 3.9%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

1
CookiebotMid-Market

Cookie consent and privacy compliance tools

2

Categories

3

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Well-developed marketing technology stack

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Scripts & Styles

23 Resources

17
Scripts
6
Styles
3
Async
3
Defer

Top Script Sources

esb.nu(13)consent.cookiebot.com(2)googletagmanager.com(1)cdnjs.cloudflare.com(1)

Website Identity

ESB

ESB

Organization
esb.nu/
Location detected: 🇳🇱 Netherlandsvia ip
📧 Microsoft 365nl-NL

Social Profiles

X (Twitter)LinkedIn

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Last analyzed: 12 May 2026 at 05:03

Historical Analysis & Change Tracking