korpus.cz

https://korpus.cz· First analyzed 29 May 2026· Updated 29 May 2026

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korpus.cz

Mobile

Sponsored

Hosting Provider

Charles University

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

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

CSS Frameworks

Icon Libraries

Fonts

Web Servers

SEO Analysis

D49/100

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

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

11 issues found

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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.

63/100

Passed

Critical

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...

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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.

44/100

89 mg

CO₂e / view

721.0 KB

Page Weight

80%

Cleaner Than

New Visitor

102 mg

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...

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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

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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

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.

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...

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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

15px

13px

❌ 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.

GGoogle Fonts Buy on MyFontsFlesch 39

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

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

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

Social Profiles

Facebook X (Twitter)YouTube

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Last analyzed: 29 May 2026 at 04:12

Historical Analysis & Change Tracking