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512kb.club

https://512kb.club· First analyzed 21 May 2026· Updated 21 May 2026
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512kb.club
Desktop screenshot of 512kb.club
Mobile screenshot of 512kb.club
Mobile

Sponsored

Hosting Provider

NearlyFreeSpeech.NET

IP Address

208.94.116.120

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Boston, United States

ASN

AS40630

Organization

NearlyFreeSpeech.NET

Server

Apache

Nameservers

ns.phx8.nearlyfreespeech.net.ns.phx4.nearlyfreespeech.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
500 ms10%
Speed Index
650 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
27 KB
2 requests
0–49
50–89
90–100

Architecture Stack

JAMstack
⚡ SSG
Frontend
Framework
Jekyllv4.4.1
Infrastructure
Hosting
NearlyFreeSpeech.NET

Technology Stack

1 Technologies Detected

Web Servers

1
Apache

SEO Analysis

B77/100
23
3
0
Meta Tags12/15
Content11/12
Headings8/8
Technical20/25
E-E-A-T5/7
Images0/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
5
512kb.club512kb.club

512KB Club | A showcase of lightweight websites.

The 512KB Club is an exclusive list of web pages weighing less than 512 kilobytes.

Title Length48 chars

Recommended: 50-60 chars (~288px / 580px)

Description Length82 chars

Recommended: 120-160 chars

Issues (0)

    3 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    4 URLs

    robots.txt

    1 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    7/100
    Poor
    2 14 1

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

    Sponsored

    AI & LLM Readiness

    D49/100
    Bot Access
    20/25
    Machine Read.
    8/25
    Schema Data
    5/25
    Citation
    16/25

    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
    nav
    Text ratio:12%
    Words:3,171
    Token eff.:Poor Structure
    Sections/1K:0.3
    Depth:1/5

    Structured Data

    1 JSON-LD
    Person×1.3WebSite

    Citation Readiness

    Opening Summary25w
    Descriptive Headingsavg 7w
    Canonical URL
    Open Graph2/3
    Twitter Card1/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (7)
    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
    80/100
    11
    Passed
    1
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    20/20
    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.
    68/100
    A+
    3 mg
    CO₂e / view
    26.7 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    4 mg
    vs
    Returning (cached)
    2 mg
    Annual (10K/mo)
    396 g
    Emission Segments
    Data Center
    <0.001 g
    Network
    <0.001 g
    Device
    2 mg
    Resource Breakdown
    Images
    3.1 KB
    CSS
    2.0 KB
    HTML
    21.6 KB
    Green Hosting Not Verified
    NearlyFreeSpeech.NET
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    100%Excellent
    Static / Informational

    HTTPS

    No WAF

    74d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp384r1) (384 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    06.05.2026

    Valid Until

    04.08.2026

    Subject Alternative Names (1)

    512kb.club

    SHA-256 Fingerprint

    4A:44:F0:25:0F:98:D6:A2:EE:24:2D:5A:9D:99:10:C3:51:11:9D:66...

    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    age
    2867
    content-encoding
    📦 Gzip(gzip)
    content-length
    21853
    content-security-policy
    default-src 'self'; script-src 'self' 'unsafe-inline'; style...
    content-type
    text/html; charset=UTF-8
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    30

    SPF
    DKIM
    DMARC

    Domain Information

    512kb.club

    Domain Age
    5y 6m

    Created

    22.11.2020

    Expires

    22.11.2028

    Last Updated

    07.05.2026

    Registrar

    PDR Ltd. d/b/a PublicDomainRegistry.com

    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
    57/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    -apple-system

    WCAG Partial
    79/100
    Readability
    /30
    22/30

    18px · LH --

    Hierarchy
    /20
    18/20

    2.73x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    2.66:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    -apple-system

    Sans48px

    Body Font

    -apple-system

    Sans18px

    Contrast Ratio

    2.66:1

    1 issue

    Reading Comfort

    ~39 CPL

    Narrow lines
    48px
    h1
    26px
    h2
    18px
    p

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

    ❌ Very complex text: Flesch score 6/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 2.7:1).

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

    ✅ Strong hierarchy: Headlines are 2.7x larger than body text.

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

    Flesch 6

    Color Palette

    6 unique colors
    4.42:1 AA Large Light
    #fafafa
    Background· 76.5%
    #747576
    Other· 2.6%

    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

    512KB Club

    The 512KB Club is an exclusive list of web pages weighing less than 512 kilobytes.

    512kb.club/
    5 years old
    Location detected: 🇺🇸 United Statesvia ip
    PDR Ltd. d/b/a PublicDomainRegistry.comen-CA

    Sponsored

    Last analyzed: 21 May 2026 at 19:14

    Historical Analysis & Change Tracking