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vesmir.cz

https://vesmir.cz· First analyzed 18 May 2026· Updated 18 May 2026
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vesmir.cz
Desktop screenshot of vesmir.cz
Mobile screenshot of vesmir.cz
Mobile

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Hosting Provider

INTERNET CZ, a.s.

IP Address

81.2.216.230

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS24806

Organization

INTERNET CZ, a.s.

Server

Nginx

Nameservers

ns.forpsi.net.ns.forpsi.cz.ns.forpsi.it.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
522 ms10%
Speed Index
679 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.5 MB
37 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Tailwind CSS
Infrastructure
Hosting
INTERNET CZ, a.s.

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

5 Technologies Detected

CSS Frameworks

2
Tailwind CSS
Bootstrap

Icon Libraries

1
Font Awesome

Analytics

1
Google Analytics

Web Servers

1
Nginx

SEO Analysis

B70/100
19
6
1
Meta Tags7/15
Content11/12
Headings8/8
Technical19/25
E-E-A-T3/7
Images2/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
V
vesmir.czvesmir.cz

Hlavní stránka - Časopis Vesmír

No description available for this page.

Title Length31 chars

Recommended: 50-60 chars (~190px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing meta description — important for click-through rates in SERPs

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

16,697 URLs

robots.txt

6 rules

Sitemap reference found

Local SEO

Local Search Readiness

3/100
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

D45/100
Bot Access
20/25
Machine Read.
11/25
Schema Data
0/25
Citation
14/25

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
navheader/footer
Text ratio:7%
Words:696
Token eff.:Optimal
Sections/1K:21.6
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary21w
Descriptive Headingsavg 3.7w
Canonical URL
Open Graph3/3
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

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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.
B
78/100
12
Passed
2
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
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.
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.
47/100
C
186 mg
CO₂e / view
1.5 MB
Page Weight
60%
Cleaner Than
New Visitor
213 mg
vs
Returning (cached)
107 mg
Annual (10K/mo)
22.4 kg
Emission Segments
Data Center
42 mg
Network
45 mg
Device
100 mg
Resource Breakdown
JavaScript
105.7 KB
Images
1.0 MB
CSS
261.6 KB
HTML
16.4 KB
Other
88.6 KB
Green Hosting Not Verified
INTERNET CZ, a.s.
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

81%Very Good
Interactive

HTTPS

No WAF

43d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.04.2026

Valid Until

30.06.2026

Subject Alternative Names (1)

vesmir.cz

SHA-256 Fingerprint

DF:14:35:AE:B9:F2:3D:43:F1:F0:A5:2C:08:58:86:53:0F:ED:C7:D3...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-cache, no-store, max-age=0, must-revalidate)
content-encoding
📦 Gzip(gzip)
content-language
cs-CZ
content-security-policy
default-src 'none'; script-src https: blob: data: 'unsafe-in...
content-type
text/html;charset=UTF-8
date
Mon, 18 May 2026 16:18:01 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

68

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (3)

pmg2.ucl.cas.cz
pmg3.ucl.cas.cz
pmg1.ucl.cas.cz

Domain Information

vesmir.cz

Domain Age
23y 6m

Created

04.11.2002

Expires

03.11.2026

Last Updated

22.07.2022

Registrar

REG-INTERNET-CZ

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
Data Protection Officer mentioned

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
70/100
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, shrink-to-fit=no
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Fira Sans Condensed

WCAG Partial
70/100
Readability
/30
26/30

16px · LH 1.50

Hierarchy
/20
19/20

2.81x ratio · ✓ H1→H6

WCAG
/25
10/25

2.69:1 min contrast

Performance
/25
15/25

2 fonts · 3 req

Heading Font

Fira Sans Condensed

Sans45px

Body Font

Fira Sans Condensed

Sans16px

Contrast Ratio

2.69:1

28 issues

Reading Comfort

~36 CPL

Narrow lines
45px
h1
20px
h2
27px
h3
22px
h4
16px
p

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 28 elements below WCAG AA threshold (min 2.7:1).

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

✅ Strong hierarchy: Headlines are 2.8x 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 MyFontsFlesch 51

Color Palette

11 unique colors
2.89:1 Fail Light
#ffffff
Primary· 64.4%
#9c988b
Secondary· 2.9%
#13100d
Secondary· 5.5%
#5d5645
Secondary· 5%
#32241d
Secondary· 4.4%
#89624f
Secondary· 4.3%
#947d66
Secondary· 3.2%
#e6eaec
Secondary· 2.9%

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

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Scripts & Styles

8 Resources

5
Scripts
3
Styles
0
Async
0
Defer

Top Script Sources

local(5)

Website Identity

vesmir.cz

23 years old
Location detected: 🇨🇿 Czech Republicvia tld
REG-INTERNET-CZcs-CZ

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Last analyzed: 18 May 2026 at 16:18

Historical Analysis & Change Tracking