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kurzgesagt.org

https://kurzgesagt.org· First analyzed 17 May 2026· Updated 17 May 2026
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kurzgesagt.org
Desktop screenshot of kurzgesagt.org
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Mobile

Sponsored

Hosting Provider

DigitalOcean
digitalocean.com

IP Address

64.226.65.178

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS14061

Organization

DigitalOcean, LLC

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns1098.ui-dns.com.ns1098.ui-dns.biz.ns1098.ui-dns.org.ns1098.ui-dns.de.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
745 ms10%
Speed Index
968 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
49 requests

Image Optimization

Lazy LoadResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

Hybrid
⚙️ SSR
Frontend
Framework
Next.js
CMS
Strapi
Infrastructure
Hosting
DigitalOcean
CDN
Cloudflare

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Meta Frameworks

1
Next.js

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

C62/100
18
8
0
Meta Tags7/15
Content8/12
Headings6/8
Technical14/25
E-E-A-T0/7
Images6/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
K
kurzgesagt.orgkurzgesagt.org

Home | kurzgesagt

kurzgesagt exists to make science and humanism appealing to as many people as possible.

Title Length17 chars

Recommended: 50-60 chars (~106px / 580px)

Description Length87 chars

Recommended: 120-160 chars

Issues (0)

    8 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    5 rules

    Sitemap reference found

    Allows all crawlers

    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

    F39/100
    Bot Access
    20/25
    Machine Read.
    6/25
    Schema Data
    0/25
    Citation
    13/25

    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:1%
    Words:249
    Token eff.:Too Short
    Sections/1K:32.1

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary44w
    Descriptive Headingsavg 2.8w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    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.
    A
    86/100
    13
    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
    18/20
    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
    9/15
    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.
    66/100
    B
    138 mg
    CO₂e / view
    1.3 MB
    Page Weight
    70%
    Cleaner Than
    New Visitor
    158 mg
    vs
    Returning (cached)
    79 mg
    Annual (10K/mo)
    16.6 kg
    Emission Segments
    Data Center
    7 mg
    Network
    41 mg
    Device
    91 mg
    Resource Breakdown
    JavaScript
    441.2 KB
    Images
    580.2 KB
    CSS
    117.9 KB
    HTML
    65.5 KB
    Other
    163.1 KB
    Green Hosting Verified
    DigitalOcean
    Provider Match
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    36%Critical
    Interactive

    HTTPS

    WAF

    75d

    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/1.1+H3

    Valid From

    03.05.2026

    Valid Until

    01.08.2026

    Subject Alternative Names (1)

    kurzgesagt.org

    SHA-256 Fingerprint

    8A:98:A6:72:26:77:51:41:77:FB:A3:FD:40:2E:34:BA:BF:95:EA:ED...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cf-ray🇩🇪 Frankfurt
    9fd35e4659e9d412-FRA
    cache-control
    🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)
    connection
    keep-alive
    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html; charset=utf-8
    date
    Sun, 17 May 2026 14:38:52 GMT
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    100

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (1)

    kurzgesagt-org.mail.protection.outlook.com

    Domain Information

    kurzgesagt.org

    Domain Age
    12y 10m

    Created

    15.07.2013

    Expires

    15.07.2026

    Last Updated

    29.08.2025

    Registrar

    IONOS SE

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Usercentrics

    Cookie Consent Banner
    Usercentrics
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Usercentrics
    Privacy policy page linked

    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.
    C
    68/100
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Montserrat-Medium + Montserrat-Regular

    WCAG Partial
    67/100
    Readability
    /30
    22/30

    18px · LH 1.50

    Hierarchy
    /20
    17/20

    8.67x ratio · ✓ H1→H6

    WCAG
    /25
    13/25

    1:1 min contrast

    Performance
    /25
    15/25

    2 fonts · 2 req

    Heading Font

    Montserrat-Medium

    Sans156px

    Body Font

    Montserrat-Regular

    Sans18px

    Contrast Ratio

    1:1

    12 issues

    Reading Comfort

    ~36 CPL

    Narrow lines
    156px
    h1
    130px
    h2
    26px
    h3
    18px
    p

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

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

    ⚠️ Partial contrast: 12 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 8.7x larger than body text.

    ❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

    Buy on MyFontsFlesch 56

    Color Palette

    6 unique colors
    Light
    #ffffff
    Text· 13.399999999999999%
    #050029
    Accent· 67.8%
    #3a4677
    Secondary· 6.5%
    #7fb3b9
    Secondary· 4.5%
    #030948
    Primary· 4.4%
    #19123c
    Primary· 3.4%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    21 Resources

    20
    Scripts
    1
    Styles
    3
    Async
    11
    Defer

    Top Script Sources

    local(16)googletagmanager.com(2)app.usercentrics.eu(2)

    Website Identity

    kurzgesagt.org

    12 years old
    Location detected: 🇩🇪 Germanyvia ip
    IONOS SE📧 Microsoft 365en

    Sponsored

    Last analyzed: 17 May 2026 at 14:39

    Historical Analysis & Change Tracking