vangoghletters.org

https://vangoghletters.org· First analyzed 12 May 2026· Updated 12 May 2026

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vangoghletters.org

Mobile

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Hosting Provider

Knaw

IP Address

195.169.88.174

Site Location

🇳🇱 Netherlandsvia ip

Server Location

🇳🇱 Amersfoort, Netherlands

ASN

AS1103

Organization

Knaw

Server

Nginx

Nameservers

ns1.zurich.surf.net.ns1.surfnet.nl.ns3.surfnet.nl.ns2.surfnet.nl.

Performance

Core Web Vitals

Weight

First Contentful Paint

692 ms10%

Speed Index

900 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

380 KB

31 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Knaw

Technology Stack

1 Technologies Detected

Web Servers

Nginx

SEO Analysis

D49/100

Meta Tags4/15

Content7/12

Headings6/8

Technical11/25

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

vangoghletters.orgvangoghletters.org

Vincent van Gogh The Letters

No description available for this page.

Title Length28 chars

Recommended: 50-60 chars (~174px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

11 issues found

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Crawlability

Sitemap

Type: standard

1,912 URLs

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

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.

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AI & LLM Readiness

F30/100

Bot Access

20/25

Machine Read.

5/25

Schema Data

0/25

Citation

5/25

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:12%

Words:136

Token eff.:Too Short

Sections/1K:7.4

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1w

Canonical URL

Open Graph0/3

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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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.

64/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

12/20

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

6/15

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

ARIA & Roles

1/15

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.

46/100

47 mg

CO₂e / view

380.4 KB

Page Weight

90%

Cleaner Than

New Visitor

54 mg

Returning (cached)

27 mg

Annual (10K/mo)

5.6 kg

Emission Segments

Data Center

11 mg

Network

11 mg

Device

25 mg

Resource Breakdown

JavaScript

257.2 KB

Images

74.7 KB

CSS

46.6 KB

HTML

2.0 KB

Green Hosting Not Verified

Knaw

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

56%Poor

Interactive

HTTPS

No WAF

175d

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

04.11.2025

Valid Until

04.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (5)

vangoghletters.orgwww.vangoghletters.orgvgstat.huygens.knaw.nlvgtile.huygens.knaw.nlvgtile.vangoghletters.org

SHA-256 Fingerprint

69:CA:42:6A:8B:39:B7:FC:D6:FB:87:04:FE:69:49:58:B9:E9:F9:A5...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔴 No Cache(no-store)

content-encoding

📦 Gzip(gzip)

content-length

1745

content-security-policy

frame-ancestors 'none'

content-type

text/html

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

vangoghletters-org.mail.protection.outlook.com

Domain Information

vangoghletters.org

Domain Age

18y 3m

Created

28.01.2008

Expires

28.01.2027

Last Updated

18.12.2025

Registrar

Realtime Register B.V.

DNSSEC

Not Enabled

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.

32/100

Not Mobile Friendly

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.

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

myriad-pro

WCAG Partial

62/100

Readability

/30

22/30

17px · LH 1.11

Hierarchy

/20

12/20

1.23x ratio · ✓ H1→H6

WCAG

/25

14/25

1:1 min contrast

Performance

/25

14/25

2 fonts

Heading Font

myriad-pro

Sans21px

Body Font

myriad-pro

Sans17px

Contrast Ratio

1:1

5 issues

Reading Comfort

~55 CPL

Optimal (45–75)

21px

19px

17px

✅ Excellent readability: 17px body text is ideal for all devices.

⚠️ Tight line spacing (1.11). Increase to 1.4–1.6 for better readability.

✅ Optimal line length: ~55 chars/line (ideal 45–75 CPL).

⚠️ Hard to read: Flesch score 30/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 1.0:1).

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

Buy on MyFontsFlesch 31

Color Palette

8 unique colors

Light

#ffffff

Background· 26.7%

#2f72cb

Primary· 50.3%

#948571

Secondary· 5.3%

#5f8aa9

Secondary· 4.7%

#e5d1b4

Secondary· 4.6%

#414a4f

Border· 4.4%

#9aaca2

Secondary· 1.9%

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Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)use.typekit.com(1)

Website Identity

vangoghletters.org

18 years old

Location detected: 🇳🇱 Netherlandsvia ip

Realtime Register B.V.📧 Microsoft 365en

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Last analyzed: 12 May 2026 at 20:11

Historical Analysis & Change Tracking