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korpus.cz

https://korpus.cz· First analyzed 29 May 2026· Updated 29 May 2026
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korpus.cz
Desktop screenshot of korpus.cz
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Mobile

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Hosting Provider

IP Address

195.113.53.66

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS2852

Organization

Charles University

Server

Nginx

Nameservers

golias.ruk.cuni.cz.david.ruk.cuni.cz.trnka.korpus.cz.skalicka.korpus.cz.

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%
721 KB
34 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Charles University

Technology Stack

5 Technologies Detected

Libraries

1

CSS Frameworks

1

Icon Libraries

1

Web Servers

1

SEO Analysis

D49/100
13
9
2
Meta Tags4/15
Content12/12
Headings3/8
Technical9/21
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
K
korpus.czkorpus.cz

Portál | Český národní korpus

No description available for this page.

Title Length29 chars

Recommended: 50-60 chars (~175px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • Missing meta description — important for click-through rates in SERPs
  • Missing H1 tag — every page should have exactly one H1

Local SEO

Local Search Readiness

2/100
Poor
1 14 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

F39/100
Bot Access
20/25
Machine Read.
13/25
Schema Data
0/25
Citation
6/25

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
header/footer
Text ratio:33%
Words:1,207
Token eff.:Optimal
Sections/1K:14.1
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary54w
Descriptive Headingsavg 2.6w
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...

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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.
C
63/100
6
Passed
5
Critical
1
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
8/20
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
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
4 recommendations
  • Accessibility recommendation preview...

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.
44/100
B
89 mg
CO₂e / view
721.0 KB
Page Weight
80%
Cleaner Than
New Visitor
102 mg
vs
Returning (cached)
51 mg
Annual (10K/mo)
10.7 kg
Emission Segments
Data Center
20 mg
Network
21 mg
Device
48 mg
Resource Breakdown
JavaScript
20.3 KB
Images
264.1 KB
CSS
425.9 KB
Fonts
2.4 KB
HTML
8.3 KB
Green Hosting Not Verified
Charles University
4 recommendations
  • Carbon footprint recommendation preview...
C

Security Score

61%Fair
Interactive

HTTPS

No WAF

112d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

18.09.2025

Valid Until

18.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (18)

korpus.czutils.korpus.czfcs.korpus.czwiki.korpus.czforms.korpus.czucnk.ff.cuni.czpark.korpus.czkwords.korpus.cz+10 more

SHA-256 Fingerprint

2C:F6:A1:E8:02:A8:4A:D3:F0:EB:4F:D0:69:83:B8:66:B1:93:47:66...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

content-encoding
📦 Gzip(gzip)
content-length
8209
content-security-policy
default-src https: data: blob: 'unsafe-inline' 'unsafe-eval'
content-type
text/html; charset=utf-8
date
Fri, 29 May 2026 04:11:51 GMT
server
nginx/1.18.0 (Ubuntu)
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

73

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.korpus.cz

Domain Information

korpus.cz

Domain Age
18y 7m

Created

17.10.2007

Expires

16.10.2031

Last Updated

21.03.2024

Registrar

REG-INTERNET-CZ

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
55/100
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
2 recommendations
  • Mobile compatibility recommendation preview...

Typography & Readability

Verdana

WCAG Partial
54/100
Readability
/30
15/30

13px · LH 1.60

Hierarchy
/20
4/20
WCAG
/25
16/25

3.26:1 min contrast

Performance
/25
19/25

System fonts

Heading Font

Verdana

Sans

Body Font

Verdana

Sans13px

Contrast Ratio

3.26:1

1 issue

Reading Comfort

~42 CPL

Narrow lines
19px
h2
15px
h3
13px
p

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

⚠️ Hard to read: Flesch score 39/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 3.3:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

Color Palette

5 unique colors
Dark
#4d4e4a
Text· 6.7%
#f2efea
Secondary· 59.400000000000006%
#3a0a1a
Accent· 15.1%
#fefdfd
Primary· 11.3%
#c0d0ce
Secondary· 7.7%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

11 Resources

4
Scripts
7
Styles
0
Async
0
Defer

Top Script Sources

local(2)code.jquery.com(1)korpus.cz(1)

Website Identity

korpus.cz

cnk@korpus.cz
18 years old
Location detected: 🇨🇿 Czech Republicvia tld
REG-INTERNET-CZ

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Last analyzed: 29 May 2026 at 04:12

Historical Analysis & Change Tracking