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clusterlabs.org

https://clusterlabs.org· First analyzed 19 May 2026· Updated 19 May 2026
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clusterlabs.org
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Mobile

Sponsored

Hosting Provider

Hetzner
hetzner.com

IP Address

95.217.104.78

Site Location

🇫🇮 Finlandvia ip

Server Location

🇫🇮 Helsinki, Finland

ASN

AS24940

Organization

HETZNER-DC

Server

Apache

Nameservers

dns1.p02.nsone.net.dns3.p02.nsone.net.dns4.p02.nsone.net.dns2.p02.nsone.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
580 ms10%
Speed Index
754 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
30 KB
9 requests
0–49
50–89
90–100

Architecture Stack

JAMstack
⚡ SSG
Frontend
Framework
Hugov0.136.5
Styling
Tailwind CSS
Infrastructure
Hosting
Hetzner

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Web Servers

1
Apachev2.4.62

SEO Analysis

B72/100
22
3
0
Meta Tags7/15
Content9/12
Headings8/8
Technical20/25
E-E-A-T2/7
Images4/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
C
clusterlabs.orgclusterlabs.org

ClusterLabs

ClusterLabs provides free and open-source software for high-availability clustering

Title Length11 chars

Recommended: 50-60 chars (~66px / 580px)

Description Length95 chars

Recommended: 120-160 chars

Issues (0)

    3 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    12 URLs

    robots.txt

    3 rules

    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

    F29/100
    Bot Access
    3/25
    Machine Read.
    7/25
    Schema Data
    5/25
    Citation
    14/25

    AI Bot Access

    0/14 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
    navheader/footer
    Text ratio:9%
    Words:240
    Token eff.:Too Short
    Sections/1K:12.5
    Depth:2/5

    Structured Data

    1 JSON-LD
    Person×1.3WebSite

    Citation Readiness

    Opening Summary34w
    Descriptive Headingsavg 2.3w
    Canonical URL
    Open Graph2/3
    Twitter Card3/3
    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.
    A
    80/100
    13
    Passed
    1
    Critical
    2
    Warnings
    Images & Alt Text
    18/20
    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
    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
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    4/15
    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.
    77/100
    A+
    3 mg
    CO₂e / view
    30.0 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    4 mg
    vs
    Returning (cached)
    2 mg
    Annual (10K/mo)
    360 g
    Emission Segments
    Data Center
    <0.001 g
    Network
    <0.001 g
    Device
    2 mg
    Resource Breakdown
    JavaScript
    9.7 KB
    Images
    3.6 KB
    CSS
    11.1 KB
    HTML
    5.6 KB
    Green Hosting Verified
    Hetzner Online GmbH
    GWF Verified
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    21%Critical
    Interactive

    HTTPS

    No WAF

    30d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    21.03.2026

    Valid Until

    19.06.2026

    Subject Alternative Names (9)

    bugs.clusterlabs.orgbugzilla.clusterlabs.orgbuild.clusterlabs.orgclusterlabs.orglists.clusterlabs.orgoss.clusterlabs.orgprojects.clusterlabs.orgwiki.clusterlabs.org+1 more

    SHA-256 Fingerprint

    73:D1:EB:22:9B:EC:40:4A:87:4D:8D:9F:03:29:98:CD:13:D4:2E:1D...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    cache-control
    🟡 0s(max-age=0)
    connection
    Keep-Alive
    content-encoding
    📦 Gzip(gzip)
    content-length
    5394
    content-type
    text/html; charset=utf-8
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    70

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (1)

    mx1.clusterlabs.org

    Domain Information

    clusterlabs.org

    Domain Age
    18y 10m

    Created

    19.07.2007

    Expires

    19.07.2026

    Last Updated

    24.06.2025

    Registrar

    Nom-iq Ltd. dba COM LAUDE

    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.
    B
    75/100
    Mobile Friendly1 breakpoint
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Roboto Slab + Open Sans

    WCAG Partial
    68/100
    Readability
    /30
    19/30

    15px · LH 1.75

    Hierarchy
    /20
    19/20

    2.45x ratio · ✓ H1→H6

    WCAG
    /25
    17/25

    2.48:1 min contrast

    Performance
    /25
    13/25

    2 fonts · 3 req

    Heading Font

    Roboto Slab

    Sans36px

    Body Font

    Open Sans

    Sans15px

    Contrast Ratio

    2.48:1

    3 issues

    Reading Comfort

    ~41 CPL

    Narrow lines
    36px
    h1
    24px
    h2
    15px
    p

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

    ❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 3 elements below WCAG AA threshold (min 2.5:1).

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

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    ✅ Lean font stack: 2 font families keeps load times fast.

    Buy on MyFontsFlesch 0

    Color Palette

    8 unique colors
    3.7:1 AA Large Light
    #ffffff
    Primary· 89.69999999999999%
    #81858e
    Other· 1.5%
    #b6ced5
    Secondary· 2.2%
    #60c8e4
    Accent· 1.5%
    #e0f2f5
    Accent· 1.4%
    #7db0c0
    Secondary· 1.1%

    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

    4 Resources

    2
    Scripts
    2
    Styles
    0
    Async
    1
    Defer

    Top Script Sources

    local(2)

    Website Identity

    ClusterLabs

    www.clusterlabs.org/
    18 years old
    Location detected: 🇫🇮 Finlandvia ip
    Nom-iq Ltd. dba COM LAUDEen-us

    Sponsored

    Last analyzed: 19 May 2026 at 16:05

    Historical Analysis & Change Tracking