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leidenranking.com

https://leidenranking.com· First analyzed 09 May 2026· Updated 09 May 2026
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leidenranking.com
Desktop screenshot of leidenranking.com
Mobile screenshot of leidenranking.com
Mobile

Sponsored

Hosting Provider

Universiteit Leiden

IP Address

132.229.26.33

Site Location

🇳🇱 Netherlandsvia ip

Server Location

🇳🇱 Oegstgeest, Netherlands

ASN

AS1103

Organization

Universiteit Leiden

Nameservers

ns1.surfnet.nl.ns2.surfnet.nl.ns3.surfnet.nl.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
335 ms10%
Speed Index
436 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
56 KB
5 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Universiteit Leiden

Technology Stack

1 Technologies Detected

Icon Libraries

1
Font Awesome

SEO Analysis

D57/100
15
9
0
Meta Tags7/15
Content4/12
Headings8/8
Technical13/25
E-E-A-T3/7
Images4/7
Links2/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
L
leidenranking.comleidenranking.com

CWTS Leiden Ranking

The CWTS Leiden Ranking offers important insights into the scientific performance for major universities worldwide. Select your preferred indicators, generat...

Description truncated.
Title Length19 chars

Recommended: 50-60 chars (~116px / 580px)

Description Length212 chars

Recommended: 120-160 chars

Issues (0)

    9 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    1 URLs

    robots.txt

    Local SEO

    Local Search Readiness

    3/100
    Poor
    1 14 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D42/100
    Bot Access
    20/25
    Machine Read.
    10/25
    Schema Data
    0/25
    Citation
    12/25

    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.txtinvalid
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    Text ratio:13%
    Words:135
    Token eff.:Too Short
    Sections/1K:14.8

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary28w
    Descriptive Headingsavg 4w
    Canonical URL
    Open Graph3/3
    Twitter Card1/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    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.
    B
    76/100
    10
    Passed
    2
    Critical
    0
    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
    1/15
    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.
    61/100
    A+
    7 mg
    CO₂e / view
    56.3 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    8 mg
    vs
    Returning (cached)
    4 mg
    Annual (10K/mo)
    840 g
    Emission Segments
    Data Center
    2 mg
    Network
    2 mg
    Device
    4 mg
    Resource Breakdown
    Images
    14.8 KB
    CSS
    38.8 KB
    HTML
    2.6 KB
    Green Hosting Not Verified
    Universiteit Leiden
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    76%Good
    Static / Informational

    HTTPS

    No WAF

    185d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    Hellenic Academic and Research Institutions CA

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/2

    Valid From

    10.11.2025

    Valid Until

    10.11.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (5)

    leidenranking.comwww.leidenranking.comclosed.leidenranking.comtraditional.leidenranking.comopen.leidenranking.com

    SHA-256 Fingerprint

    12:B1:36:E1:AD:4C:0A:16:2B:00:51:29:70:92:E4:17:30:FB:68:AE...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    content-encoding
    📦 Gzip(gzip)
    content-length
    2410
    content-type
    text/html
    date
    Sat, 09 May 2026 12:10:01 GMT
    etag
    "807ebaeecc48dc1:0"
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    leidenranking.com

    Domain Age
    16y 3m

    Created

    03.02.2010

    Expires

    03.02.2027

    Last Updated

    04.02.2026

    Registrar

    Key-Systems GmbH

    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.
    D
    52/100
    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.
    Viewport
    width=device-width, initial-scale=1.0
    3 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Segoe UI

    WCAG Partial
    68/100
    Readability
    /30
    17/30

    15px · LH 1.67

    Hierarchy
    /20
    17/20

    2.6x ratio · ✓ H1→H6

    WCAG
    /25
    14/25

    1:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    Segoe UI

    Sans39px

    Body Font

    Segoe UI

    Sans15px

    Contrast Ratio

    1:1

    4 issues

    Reading Comfort

    ~32 CPL

    Narrow lines
    39px
    h1
    20px
    h2
    15px
    p

    ⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

    ❌ Very complex text: Flesch score 17/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 4 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 2.6x larger than body text.

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

    Flesch 17

    Color Palette

    5 unique colors
    Light
    #ffffff
    Background· 29.500000000000004%
    #0c6779
    Primary· 52.20000000000002%
    #084f5c
    Accent· 8.600000000000001%
    #e8ecec
    Secondary· 5%
    #6a949b
    Secondary· 4.7%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    1 Resources

    0
    Scripts
    1
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    Website Identity

    leidenranking.com

    16 years old
    Location detected: 🇳🇱 Netherlandsvia ip
    Key-Systems GmbHen

    Sponsored

    Last analyzed: 09 May 2026 at 12:10

    Historical Analysis & Change Tracking