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explainthatstuff.com

https://explainthatstuff.com· First analyzed 23 Apr 2026· Updated 23 Apr 2026
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explainthatstuff.com
Desktop screenshot of explainthatstuff.com
Mobile screenshot of explainthatstuff.com
Mobile

Sponsored

Hosting Provider

Scala Hosting LLC

IP Address

209.142.64.143

Site Location

🇬🇧 Dorset, United Kingdomvia schema_nap

Server Location

🇺🇸 Hawthorne, United States

ASN

AS40476

Server

Apache

Nameservers

ns0.zen.co.uk.ns1.zen.co.uk.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
310 ms10%
Speed Index
403 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
49 KB
24 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Scala Hosting LLC

Technology Stack

4 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Web Servers

1
Apache

Languages

1
PHPv8.4.20

SEO Analysis

B74/100
22
7
0
Meta Tags8/15
Content11/12
Headings8/8
Technical19/25
E-E-A-T2/7
Images5/7
Links5/5
URL5/5
Social3/5
Freshness4/4
Mobile1/4
Indexability3/3
E
explainthatstuff.comexplainthatstuff.com

Explain that Stuff

A collection of FREE, easy-to-understand science, technology, and how-it-works articles for the whole family!

Title Length18 chars

Recommended: 50-60 chars (~107px / 580px)

Description Length109 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    30 rules

    Local SEO

    Local Search Readiness

    19/100
    Poor
    5 15

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

    Sponsored

    AI & LLM Readiness

    D50/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    5/25
    Citation
    14/25

    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:16%
    Words:2,011
    Token eff.:Optimal
    Sections/1K:26.9

    Structured Data

    1 JSON-LD
    Organization×1.1WebSitemicrodata
    sameAs entity links

    Citation Readiness

    Opening Summary26w
    Descriptive Headingsavg 2.5w
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    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
    78/100
    12
    Passed
    4
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    11/20
    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...
    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.
    64/100
    A+
    6 mg
    CO₂e / view
    48.7 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    7 mg
    vs
    Returning (cached)
    3 mg
    Annual (10K/mo)
    720 g
    Emission Segments
    Data Center
    1 mg
    Network
    1 mg
    Device
    3 mg
    Resource Breakdown
    Fonts
    23.3 KB
    HTML
    17.1 KB
    Other
    8.3 KB
    Green Hosting Not Verified
    Scala Hosting LLC
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    46%Poor
    Interactive

    HTTPS

    No WAF

    36d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/2

    Valid From

    28.02.2026

    Valid Until

    29.05.2026

    Subject Alternative Names (3)

    explainthatstuff.commail.explainthatstuff.comwww.explainthatstuff.com

    SHA-256 Fingerprint

    65:F7:48:98:39:3B:BE:B3:80:EF:E2:7C:D4:D8:3D:AC:6F:06:03:8D...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔵 3 Days(max-age=259200, must-revalidate)
    content-encoding
    📦 Gzip(gzip)
    content-length
    17242
    content-type
    text/html; charset=UTF-8
    date
    Thu, 23 Apr 2026 14:19:05 GMT
    server
    Apache
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    45

    SPF
    DKIM
    DMARC

    MX Records (1)

    mail.explainthatstuff.com

    Domain Information

    explainthatstuff.com

    Domain Age
    20 years

    Created

    22.04.2006

    Expires

    22.04.2027

    Last Updated

    13.07.2025

    Registrar

    Tucows Domains Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    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
    67/100
    Mobile Friendly4 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=1.0
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Lato

    WCAG AA
    89/100
    Readability
    /30
    28/30

    22px · LH 1.50

    Hierarchy
    /20
    19/20

    2x ratio · ✓ H1→H6

    WCAG
    /25
    22/25

    4.59:1 min contrast

    Performance
    /25
    20/25

    1 font · 1 req

    Heading Font

    Lato

    Sans44px

    Body Font

    Lato

    Sans22px

    Contrast Ratio

    4.59:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~40 CPL

    Narrow lines
    44px
    h1
    33px
    h2
    26px
    h3
    22px
    p

    ✅ Excellent readability: 22px body text is ideal for all devices.

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

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.6:1).

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

    ✅ Strong hierarchy: Headlines are 2.0x larger than body text.

    ✅ Lean font stack: 1 font families keeps load times fast.

    Buy on MyFontsFlesch 63

    Color Palette

    10 unique colors
    3.28:1 AA Large Light
    #ffffff
    Text· 61.2%
    #8f8e89
    Other· 4%
    #1d3557
    Primary· 10.8%
    #407788
    Primary· 6.8999999999999995%
    #5f4d4e
    Secondary· 4.3%
    #8faba3
    Secondary· 2.4%

    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

    10 Resources

    6
    Scripts
    4
    Styles
    4
    Async
    0
    Defer

    Top Script Sources

    cse.google.com(4)google.com(2)

    Website Identity

    Explain that Stuff

    Explain that Stuff

    Organization
    www.explainthatstuff.com/
    20 years old

    Garfield House, Garfield Lane, Swanage, Dorset

    BH19 3HJ, Dorset, BH

    United Kingdom

    Location detected: 🇬🇧 United Kingdom, Dorsetvia schema_nap
    Tucows Domains Inc.

    Social Profiles

    FacebookX (Twitter)

    Sponsored

    Last analyzed: 23 Apr 2026 at 14:19

    Historical Analysis & Change Tracking