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coderhub.edu.pl

https://coderhub.edu.pl· First analyzed 09 May 2026· Updated 09 May 2026
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coderhub.edu.pl
Desktop screenshot of coderhub.edu.pl
Mobile screenshot of coderhub.edu.pl
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.21.14.111

Site Location

🇵🇱 Polandvia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

anderson.ns.cloudflare.com.sasha.ns.cloudflare.com.

Performance

78

Core Web Vitals

Weight

First Contentful Paint
2.6 s10%
Speed Index
3.3 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
695 KB
36 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Tailwind CSS
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

11 Technologies Detected

UI Components

4
SwiperSlick CarouselOwl CarouselFancybox

Libraries

2
jQuery
Animate.css

CSS Frameworks

2
Bootstrap
Tailwind CSS

Other

1
Modernizr

Analytics

1
Matomo

CDN

1
Cloudflare

SEO Analysis

B72/100
20
6
1
Meta Tags14/15
Content12/12
Headings8/8
Technical18/25
E-E-A-T3/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
C
coderhub.edu.plcoderhub.edu.pl

CoderHub - Learn Programming and Coding Skills Online

Explore CoderHub for comprehensive programming tutorials, coding challenges, and resources to enhance your software development skills from beginner to advan...

Description truncated.
Title Length53 chars

Recommended: 50-60 chars (~321px / 580px)

Description Length168 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (24/40) — critical for accessibility and SEO

7 issues found

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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 13 2

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

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AI & LLM Readiness

F33/100
Bot Access
3/25
Machine Read.
16/25
Schema Data
0/25
Citation
14/25

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:5%
Words:1,198
Token eff.:Optimal
Sections/1K:14.2
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary50w
Descriptive Headingsavg 11.7w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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
76/100
12
Passed
3
Critical
2
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
14/15
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
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 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.
61/100
A
70 mg
CO₂e / view
694.8 KB
Page Weight
80%
Cleaner Than
New Visitor
80 mg
vs
Returning (cached)
40 mg
Annual (10K/mo)
8.4 kg
Emission Segments
Data Center
3 mg
Network
21 mg
Device
46 mg
Resource Breakdown
JavaScript
175.0 KB
Images
36.1 KB
CSS
463.0 KB
HTML
20.7 KB
Green Hosting Verified
Cloudflare
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

88%Very Good
Static / Informational

HTTPS

WAF

53d

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

02.04.2026

Valid Until

01.07.2026

Subject Alternative Names (2)

*.coderhub.edu.plcoderhub.edu.pl

SHA-256 Fingerprint

6D:5E:B6:7C:38:52:A0:9B:06:11:E7:45:56:5A:3D:4F:57:0A:A0:54...

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
MISS
cf-ray🇮🇹 Milan
9f8ef3b589ef6da0-MXP
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

coderhub.edu.pl

Domain Age
8 months

Created

08.09.2025

Expires

08.09.2026

Last Updated

02.04.2026

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
72/100
Mobile Friendly17 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

Quicksand

WCAG Partial
71/100
Readability
/30
19/30

16px · LH 1.80

Hierarchy
/20
19/20

2.34x ratio · ✓ H1→H6

WCAG
/25
15/25

1:1 min contrast

Performance
/25
18/25

1 font · 6 req

Heading Font

Quicksand

Sans38px

Body Font

Quicksand

Sans16px

Contrast Ratio

1:1

2 issues

Reading Comfort

~129 CPL

Too wide
38px
h1
44px
h2
23px
h3
17px
h4
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

❌ Very long lines: ~129 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 2 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 2.3x 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 MyFonts

Color Palette

5 unique colors
2.42:1 Fail Light
#bcbcbc
Other· 45.8%
#65797a
Secondary· 2%
#000101
Primary· 6%
#d7eae7
Secondary· 1.4%

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

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Scripts & Styles

16 Resources

6
Scripts
10
Styles
1
Async
0
Defer

Top Script Sources

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

Website Identity

coderhub.edu.pl

242 days old
Location detected: 🇵🇱 Polandvia tld
Hosting Concepts B.V.en

Sponsored

Last analyzed: 09 May 2026 at 07:22

Historical Analysis & Change Tracking