casopis-sifra.cz

https://casopis-sifra.cz· First analyzed 29 May 2026· Updated 29 May 2026

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casopis-sifra.cz

Mobile

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Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.67.140.174

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

raina.ns.cloudflare.com.albert.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

981 ms10%

Speed Index

1.3 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

18 KB

20 requests

Image Optimization

Lazy LoadAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

4 Technologies Detected

Libraries

CSS Frameworks

Fonts

CDN

SEO Analysis

B76/100

Meta Tags14/15

Content6/12

Headings8/8

Technical20/25

E-E-A-T2/7

Images4/7

Links5/5

URL5/5

Social5/5

Freshness0/4

Mobile4/4

Indexability3/3

casopis-sifra.czcasopis-sifra.cz

Časopis Šifra – nezávislý měsíčník o skrytých souvislostech světa

Šifra je nezávislý časopis pro ty, kteří cítí, že věci nejsou tak, jak vypadají. Odhaluje skryté souvislosti a rozpory naší reality.

Title Length65 chars

Recommended: 50-60 chars (~392px / 580px)

Description Length132 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (9/9) — critical for accessibility and SEO

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

289 URLs

robots.txt

36 rules

Sitemap reference found

Local SEO

Local Search Readiness

7/100

Poor

2 14 1

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

D46/100

Bot Access

15/25

Machine Read.

11/25

Schema Data

5/25

Citation

15/25

AI Bot Access

6/14 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

nav

Text ratio:6%

Words:302

Token eff.:Optimal

Sections/1K:3.3

Depth:1/5

Structured Data

1 JSON-LD

Organization×1.1WebSite

Citation Readiness

Opening Summary30w

Descriptive Headingsavg 13w

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

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.

80/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

18/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

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

3/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

1 recommendation

•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.

76/100

A+

2 mg

CO₂e / view

17.9 KB

Page Weight

95%

Cleaner Than

New Visitor

2 mg

Returning (cached)

1 mg

Annual (10K/mo)

216 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

1 mg

Resource Breakdown

JavaScript

5.6 KB

Fonts

3.0 KB

HTML

9.2 KB

Green Hosting Verified

Cloudflare

GWF Verified

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

WAF

36d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

06.04.2026

Valid Until

05.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

casopis-sifra.cz

SHA-256 Fingerprint

88:EB:68:00:25:A0:73:08:1D:BD:19:A4:3B:16:C2:05:33:DD:68:5F...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cf-cache-status

DYNAMIC

cf-ray🇮🇹 Milan

a038c5796e9fee4f-MXP

content-encoding

zstd

content-type

text/html; charset=utf-8

date

Fri, 29 May 2026 22:00:21 GMT

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

SMTP.GOOGLE.COM

Domain Information

casopis-sifra.cz

Domain Age

11y 8m

Created

29.09.2014

Expires

28.09.2027

Last Updated

09.05.2026

Registrar

REG-GRANSY

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.

68/100

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

1 recommendation

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Andulka Sans + Oxygen

WCAG Partial

66/100

Readability

/30

26/30

18px · LH 1.65

Hierarchy

/20

16/20

3.11x ratio · ✓ H1→H6

WCAG

/25

12/25

1.13:1 min contrast

Performance

/25

12/25

3 fonts · 7 req

Heading Font

Andulka Sans

Sans56px

Body Font

Oxygen

Sans18px

Contrast Ratio

1.13:1

5 issues

Reading Comfort

Dual Sans-Serif

center aligned

56px

40px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

⚠️ Partial contrast: 5 elements below WCAG AA threshold (min 1.1:1).

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

✅ Strong hierarchy: Headlines are 3.1x larger than body text.

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

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

GGoogle Fonts Buy on MyFontsFlesch 69

Color Palette

8 unique colors

Light

#f4f1e8

Primary· 86.3%

#897f2a

Accent· 2.8%

#af8a47

Secondary· 2.7%

#4e4408

Accent· 2.5%

#e2dac0

Secondary· 2.4%

#ceb881

Secondary· 1.3%

#b2ae82

Secondary· 1.3%

#9f4d28

Accent· 0.7%

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Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.prod.website-files.com(3)ajax.googleapis.com(1)d3e54v103j8qbb.cloudfront.net(1)static.cloudflareinsights.com(1)

Website Identity

Šifra

Šifra je nezávislý časopis pro ty, kteří cítí, že věci nejsou tak, jak vypadají. Odhaluje skryté souvislosti a rozpory naší reality.

11 years old

Location detected: 🇨🇿 Czech Republicvia tld

REG-GRANSY📧 Google Workspaceen

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Last analyzed: 29 May 2026 at 22:00

Historical Analysis & Change Tracking