jsns.cz

https://jsns.cz· First analyzed 24 May 2026· Updated 24 May 2026

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jsns.cz

Mobile

Sponsored

Hosting Provider

NIC

IP Address

217.31.202.69

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS25192

Organization

NIC

Server

Nginx

Nameservers

ns1.regzone.de.ns1.regzone.info.ns1.regzone.cz.

Performance

Core Web Vitals

Weight

First Contentful Paint

995 ms10%

Speed Index

1.3 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

832 KB

82 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

dt-the7Custom

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

17 Technologies Detected

Analytics

Matomo Microsoft Clarity

Other

Other

UI Components

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

Marketing

Advertising

Popups & Forms

Web Servers

SEO Analysis

C65/100

Meta Tags14/15

Content10/12

Headings3/8

Technical15/25

E-E-A-T3/7

Images3/7

Links5/5

URL5/5

Social1/5

Freshness0/4

Mobile3/4

Indexability3/3

jsns.czjsns.cz

JSNS – výukové filmy a aktivity zdarma – JSNS.CZ

Dokumentární filmy, výukové lekce a projekty, které pomáhají otevírat důležitá společenská témata ve škole. Promítejte zdarma a legálně.

Title Length49 chars

Recommended: 50-60 chars (~298px / 580px)

Description Length136 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

11 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

2,037 URLs

robots.txt

14 rules

Local SEO

Local Search Readiness

5/100

Poor

2 14 2

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

Sponsored

AI & LLM Readiness

F28/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

0/25

Citation

7/25

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

Text ratio:13%

Words:10,463

Token eff.:Excessive

Structured Data

No Schema

Citation Readiness

Opening Summary278w

Descriptive Headings

Canonical URL

Open Graph1/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

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.

73/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

6/20

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

11/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

6/15

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

2 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.

35/100

103 mg

CO₂e / view

832.3 KB

Page Weight

80%

Cleaner Than

New Visitor

118 mg

Returning (cached)

59 mg

Annual (10K/mo)

12.3 kg

Emission Segments

Data Center

23 mg

Network

25 mg

Device

55 mg

Resource Breakdown

JavaScript

178.9 KB

Images

346.6 KB

CSS

286.5 KB

Fonts

927 B

HTML

11.3 KB

Other

8.0 KB

Green Hosting Not Verified

NIC

5 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

21%Critical

Interactive

HTTPS

No WAF

34d

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/1.1

Valid From

30.03.2026

Valid Until

28.06.2026

Subject Alternative Names (20)

avskola.czbytvobraze.czjedensvetnaskolach.czjsns.czkdojiny.cznaivator.czoneworldinschools.czpribehybezpravi.cz+12 more

SHA-256 Fingerprint

EA:0A:21:9F:2D:F4:BC:0F:D4:0D:18:BD:49:15:E9:CA:D6:2C:25:6E...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-language

content-type

text/html; charset=UTF-8

date

Sun, 24 May 2026 18:23:44 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

jsns-cz.mail.protection.outlook.com

Domain Information

jsns.cz

Domain Age

14y 11m

Created

29.06.2011

Expires

28.06.2026

Last Updated

07.07.2020

Registrar

REG-ZONER

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis 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.

76/100

Mobile Friendly24 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...

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Typography & Readability

Merriweather

WCAG Partial

62/100

Readability

/30

18/30

14px · LH 1.63

Hierarchy

/20

15/20

1.86x ratio · ✓ H1→H6

WCAG

/25

14/25

1:1 min contrast

Performance

/25

15/25

1 font · 1 req

Heading Font

Merriweather

Serif26px

Body Font

Merriweather

Serif14px

Contrast Ratio

1:1

10 issues

Reading Comfort

~39 CPL

Narrow lines

26px

23px

16px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Partial contrast: 10 elements below WCAG AA threshold (min 1.0:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

GGoogle FontsFlesch 51

Color Palette

8 unique colors

2.45:1 Fail Light

#ffffff

Primary· 34%

#a2a7a2

Other· 5.6%

#06406a

Accent· 30.1%

#e3021c

Accent· 8.4%

#278cc5

Accent· 5.6%

#d4dee1

Secondary· 4.3%

#4e486d

Secondary· 1.5%

Business & Marketing Stack

6 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Microsoft ClarityFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(5)local(3)connect.facebook.net(2)consent.cookiebot.com(2)unpkg.com(2)

Website Identity

jsns.cz

14 years old

Location detected: 🇨🇿 Czech Republicvia tld

REG-ZONER📧 Microsoft 365cs

Social Profiles

Facebook X (Twitter)Instagram

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Last analyzed: 24 May 2026 at 18:24

Historical Analysis & Change Tracking