zwijsen.nl

https://zwijsen.nl· First analyzed 19 May 2026· Updated 19 May 2026

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zwijsen.nl

Mobile

Sponsored

Hosting Provider

Kinsta

cloudflare.com

IP Address

162.159.134.42

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns3.internl.net.ns.internlnet.nl.ns4.internl.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.1 s10%

Speed Index

1.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.4 MB

246 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Technology Stack

20 Technologies Detected

Libraries

jQueryv3.7.1

jQuery UI

Lodash Moment.js

UI Components

Swiper Slick Carousel

CSS Frameworks

Bootstrapv6.3.3

Tailwind CSS

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Analytics

Frameworks

Icon Libraries

Tag Managers

Marketing

Advertising

CDN

Security

Plugins

SEO Analysis

C62/100

Meta Tags12/15

Content3/12

Headings8/8

Technical19/25

E-E-A-T0/7

Images5/7

Links4/5

URL5/5

Social0/5

Freshness0/4

Mobile3/4

Indexability3/3

zwijsen.nlzwijsen.nl

Uitgeverij Zwijsen - Breng leren tot leven

Al 180 jaar ontwikkelen wij lesmethodes en andere educatieve uitgaven voor het basisonderwijs. Ook maken we leesboeken en leerspellen voor thuis. Onze produc...

Description truncated.

Title Length42 chars

Recommended: 50-60 chars (~252px / 580px)

Description Length215 chars

Recommended: 120-160 chars

Issues (1)

• Very thin content (7 words). Search engines need substantial content for ranking.

8 issues found

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Crawlability

Sitemap

Type: index

31 URLs

31 sub-sitemaps

robots.txt

58 rules

Sitemap reference found

Local SEO

Local Search Readiness

7/100

Poor

2 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

F23/100

Bot Access

19/25

Machine Read.

0/25

Schema Data

0/25

Citation

4/25

AI Bot Access

12/14 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

noimageai meta

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:8%

Words:6,751

Token eff.:Excessive

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 (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.

73/100

Passed

Critical

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

11/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 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.

42/100

354 mg

CO₂e / view

3.4 MB

Page Weight

15%

Cleaner Than

New Visitor

405 mg

Returning (cached)

202 mg

Annual (10K/mo)

42.5 kg

Emission Segments

Data Center

17 mg

Network

104 mg

Device

233 mg

Resource Breakdown

JavaScript

869.4 KB

Images

2.1 MB

CSS

252.1 KB

Fonts

164.6 KB

HTML

40.2 KB

Other

1.1 KB

Green Hosting Verified

Something Familiar

GWF Verified

8 recommendations

•Carbon footprint recommendation preview...

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Security Score

36%Critical

Interactive

HTTPS

WAF

68d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

27.04.2026

Valid Until

26.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

zwijsen.nl*.zwijsen.nl

SHA-256 Fingerprint

BD:2D:98:1C:F8:D2:40:68:69:24:22:2E:5E:C8:F3:B2:08:BC:D1:BF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-credentials

true

access-control-allow-headers

X-Mx-ReqToken,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Req...

access-control-allow-methods

GET, POST, OPTIONS

access-control-allow-origin

https://schoolbiebscan.zwijsen.nl

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

zwijsen-nl.mail.protection.outlook.com

Domain Information

zwijsen.nl

Domain Age

29y 2m

Created

11.03.1997

Last Updated

11.07.2025

Registrar

Registrar.eu

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

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.

73/100

Mobile Friendly31 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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

unit-rounded

WCAG Partial

78/100

Readability

/30

23/30

20px · LH 1.50

Hierarchy

/20

20/20

3x ratio · ✓ H1→H6

WCAG

/25

17/25

1:1 min contrast

Performance

/25

18/25

1 font · 4 req

Heading Font

unit-rounded

Sans60px

Body Font

unit-rounded

Sans20px

Contrast Ratio

1:1

3 issues

Reading Comfort

~42 CPL

Narrow lines

60px

32px

24px

32px

20px

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

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

⚠️ Hard to read: Flesch score 34/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 3 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 3.0x larger than body text.

AAdobe Fonts Buy on MyFontsFluid Type (rem)Flesch 34

Color Palette

8 unique colors

Light

#ededed

Background· 39.69999999999999%

#94187e

Primary· 16.7%

#feffff

Primary· 9.7%

#f8b9de

Accent· 7.1%

#afa6b8

Secondary· 7%

#ae5994

Secondary· 4.4%

#535090

Secondary· 3.2%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

zwijsen.nl(12)googletagmanager.com(3)consent.cookiebot.com(2)data.zwijsen.nl(1)consentcdn.cookiebot.com(1)

Website Identity

zwijsen.nl

29 years old

Location detected: 🇳🇱 Netherlandsvia tld

Registrar.eu📧 Microsoft 365nl

Social Profiles

Facebook Instagram LinkedIn YouTube TikTok Pinterest

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Last analyzed: 19 May 2026 at 08:44

Historical Analysis & Change Tracking