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classhub.edu.pl

https://classhub.edu.pl· First analyzed 10 May 2026· Updated 10 May 2026
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classhub.edu.pl
Desktop screenshot of classhub.edu.pl
Mobile screenshot of classhub.edu.pl
Mobile

Sponsored

Hosting Provider

Cloudflare
cloudflare.com

IP Address

188.114.97.3

Site Location

🇵🇱 Polandvia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

CloudFlare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

tia.ns.cloudflare.com.kipp.ns.cloudflare.com.

Performance

93

Core Web Vitals

Weight

First Contentful Paint
1.3 s10%
Speed Index
1.7 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2.1 MB
37 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

12 Technologies Detected

UI Components

4
SwiperSlick CarouselOwl CarouselFancybox

Libraries

2
jQuery
Animate.css

CSS Frameworks

2
Bootstrap
Tailwind CSS

Other

1
Modernizr

Icon Libraries

1
Font Awesome

Analytics

1
Matomo

CDN

1
Cloudflare

SEO Analysis

C68/100
17
9
0
Meta Tags11/15
Content11/12
Headings7/8
Technical18/25
E-E-A-T3/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
C
classhub.edu.plclasshub.edu.pl

ClassHub - Educational Resources and Learning Platform for Students

ClassHub offers a comprehensive range of educational tools and resources to enhance student learning. Explore courses, study materials, and interactive conte...

Description truncated.
Title Length67 chars

Recommended: 50-60 chars (~407px / 580px)

Description Length190 chars

Recommended: 120-160 chars

Issues (0)

    9 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    1 URLs

    1 sub-sitemaps

    robots.txt

    49 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    8/100
    Poor
    3 12 2

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

    Sponsored

    AI & LLM Readiness

    F31/100
    Bot Access
    3/25
    Machine Read.
    16/25
    Schema Data
    0/25
    Citation
    12/25

    AI Bot Access

    2/14 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
    nav
    Text ratio:4%
    Words:1,301
    Token eff.:Optimal
    Sections/1K:13.1
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary1302w
    Descriptive Headingsavg 10.8w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    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
    17/20
    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
    9/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    7/15
    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.
    40/100
    D
    219 mg
    CO₂e / view
    2.1 MB
    Page Weight
    50%
    Cleaner Than
    New Visitor
    251 mg
    vs
    Returning (cached)
    125 mg
    Annual (10K/mo)
    26.3 kg
    Emission Segments
    Data Center
    11 mg
    Network
    64 mg
    Device
    144 mg
    Resource Breakdown
    JavaScript
    175.7 KB
    Images
    28.8 KB
    CSS
    1.9 MB
    HTML
    24.5 KB
    Green Hosting Verified
    Cloudflare
    GWF Verified
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    54%Poor
    Interactive

    HTTPS

    WAF

    89d

    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/2+H3

    Valid From

    09.05.2026

    Valid Until

    07.08.2026

    Subject Alternative Names (2)

    *.classhub.edu.plclasshub.edu.pl

    SHA-256 Fingerprint

    53:E3:8C:CB:43:9B:D9:C6:A1:D3:B6:7E:43:DF:71:89:C8:AD:14:A0...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400
    cache-control
    🟡 1 Hours(public, max-age=3600)
    cf-cache-status
    EXPIRED
    cf-ray
    9f94cf67d80b8d11-BOS
    content-encoding
    zstd
    content-type
    text/html; charset=utf-8
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    classhub.edu.pl

    Domain Age
    8 months

    Created

    08.09.2025

    Expires

    08.09.2026

    Last Updated

    11.03.2026

    Registrar

    Hosting Concepts B.V.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    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
    74/100
    Mobile Friendly10 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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Fira

    WCAG Partial
    64/100
    Readability
    /30
    20/30

    14px · LH 1.70

    Hierarchy
    /20
    16/20

    2.36x ratio

    WCAG
    /25
    12/25

    1:1 min contrast

    Performance
    /25
    16/25

    1 font · 7 req

    Heading Font

    Fira

    Sans33px

    Body Font

    Fira

    Sans14px

    Contrast Ratio

    1:1

    4 issues

    Reading Comfort

    ~41 CPL

    Narrow lines
    33px
    h1
    53px
    h2
    20px
    h3
    23px
    h4
    14px
    p

    ⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

    ⚠️ Partial contrast: 4 elements below WCAG AA threshold (min 1.0:1).

    ⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ Strong hierarchy: Headlines are 2.4x larger than body text.

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

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

    Buy on MyFonts

    Color Palette

    4 unique colors
    Light
    #ffffff
    Background· 49.8%
    #c2cbd2
    Secondary· 21.5%
    #8392c3
    Secondary· 3.9%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Matomo (Piwik)Mid-Market
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    17 Resources

    7
    Scripts
    10
    Styles
    1
    Async
    1
    Defer

    Top Script Sources

    local(5)analytics.tech-vikings.com(1)static.cloudflareinsights.com(1)

    Website Identity

    classhub.edu.pl

    links@nextbacklinks.com
    243 days old
    Location detected: 🇵🇱 Polandvia tld
    Hosting Concepts B.V.en

    Sponsored

    Last analyzed: 10 May 2026 at 00:26

    Historical Analysis & Change Tracking