onlinebibliotheek.nl

https://onlinebibliotheek.nl· First analyzed 10 May 2026· Updated 10 May 2026

Export

Mobile

Sponsored

Hosting Provider

Microsoft Azure

azure.microsoft.com

IP Address

20.23.2.223

Site Location

🇳🇱 Netherlandsvia tld

Server Location

🇳🇱 Amsterdam, Netherlands

ASN

AS8075

Organization

Microsoft Azure Cloud (westeurope)

Server

Apache

Nameservers

ns1.surfnet.nl.ns1.zurich.surf.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.2 s10%

Speed Index

1.6 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

669 KB

86 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Analytics

Matomo

Web Servers

Apache

SEO Analysis

C61/100

Meta Tags13/15

Content12/12

Headings3/8

Technical13/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social1/5

Freshness0/4

Mobile4/4

Indexability3/3

onlinebibliotheek.nlonlinebibliotheek.nl

online Bibliotheek: luisterboeken en e-books

Leen e-books en luisterboeken bij de online Bibliotheek. We willen dat jij met plezier leest en luistert. Daarom heb je bij ons 24/7 toegang tot e-books en l...

Description truncated.

Title Length44 chars

Recommended: 50-60 chars (~255px / 580px)

Description Length170 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (73/76) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

34 rules

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.

Sponsored

AI & LLM Readiness

F32/100

Bot Access

11/25

Machine Read.

11/25

Schema Data

0/25

Citation

10/25

AI Bot Access

6/14 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:9%

Words:1,269

Token eff.:Optimal

Sections/1K:19.7

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary57w

Descriptive Headingsavg 3.6w

Canonical URL

Open Graph1/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

AI readiness recommendation preview...

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Sponsored

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.

81/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

16/20

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

9/15

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.

1 recommendation

•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.

61/100

68 mg

CO₂e / view

669.2 KB

Page Weight

80%

Cleaner Than

New Visitor

77 mg

Returning (cached)

39 mg

Annual (10K/mo)

8.1 kg

Emission Segments

Data Center

3 mg

Network

20 mg

Device

44 mg

Resource Breakdown

JavaScript

36.1 KB

Images

199.3 KB

CSS

417.0 KB

HTML

16.8 KB

Green Hosting Verified

Microsoft Azure

Provider Match

3 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

56%Poor

Interactive

HTTPS

No WAF

144d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

16.03.2026

Valid Until

01.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.onlinebibliotheek.nlonlinebibliotheek.nl

SHA-256 Fingerprint

08:0E:96:3F:B6:05:FE:2B:E6:7C:9C:CD:1E:51:CD:65:B3:B2:22:A2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

25395

cache-control

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

content-encoding

📦 Gzip(gzip)

content-length

16923

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt2.aspmx.l.google.com

alt3.aspmx.l.google.com

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

+1 more

Domain Information

onlinebibliotheek.nl

Domain Age

21y 5m

Created

13.12.2004

Last Updated

13.03.2026

Registrar

SURF B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

64/100

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, minimum-scale=1.0, initial-scale=1.0

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

TheMixRegular + Arial

WCAG Partial

66/100

Readability

/30

16/30

16px · LH 1.30

Hierarchy

/20

10/20

1.5x ratio

WCAG

/25

19/25

1:1 min contrast

Performance

/25

21/25

System fonts

Heading Font

TheMixRegular

Sans24px

Body Font

Arial

Sans16px

Contrast Ratio

1:1

1 issue

Reading Comfort

~40 CPL

Narrow lines

24px

36px

20px

16px

Minor Second

Scale

⚠️ Small text: 16px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Tight line spacing (1.30). Increase to 1.4–1.6 for better readability.

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

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

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

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

Buy on MyFonts

Color Palette

7 unique colors

11.79:1 AAA Dark

#39373a

Text· 42.199999999999996%

#ffffff

Background· 40.8%

#978b81

Secondary· 4.4%

#7b6d63

Secondary· 3.6%

#ded4bb

Secondary· 3.1%

#f6f2e7

Primary· 2.3%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

Website Identity

onlinebibliotheek.nl

21 years old

Location detected: 🇳🇱 Netherlandsvia tld

SURF B.V.📧 Google Workspacenl

Social Profiles

Facebook Instagram Pinterest

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Last analyzed: 10 May 2026 at 07:06

Historical Analysis & Change Tracking