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idu.cz

https://idu.cz· First analyzed 02 Jun 2026· Updated 02 Jun 2026
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idu.cz
Desktop screenshot of idu.cz
Mobile screenshot of idu.cz
Mobile

Sponsored

Hosting Provider

ALTOS software s.r.o

IP Address

92.119.66.69

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS202682

Organization

ALTOS software s.r.o

Server

Apache

Nameservers

ns.grdns.cz.ns.grdns.it.

Performance

91

Core Web Vitals

Weight

First Contentful Paint
1.4 s10%
Speed Index
1.8 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.3 MB
89 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
ALTOS software s.r.o

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

7 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

UI Components

1
Fancybox

CSS Frameworks

1
Tailwind CSS

Fonts

1
Adobe Fonts (Typekit)

Tag Managers

1
Google Tag Manager

Web Servers

1
Apachev2.4.38

SEO Analysis

D57/100
16
12
0
Meta Tags5/15
Content11/12
Headings6/8
Technical15/25
E-E-A-T3/7
Images3/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
I
idu.czidu.cz

Národní institut pro kulturu

Úvod

Title Length28 chars

Recommended: 50-60 chars (~167px / 580px)

Description Length4 chars

Recommended: 120-160 chars

Issues (0)

    12 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    2,347 URLs

    robots.txt

    12 rules

    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.

    Sponsored

    AI & LLM Readiness

    D44/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    0/25
    Citation
    11/25

    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:1,026
    Token eff.:Optimal
    Sections/1K:40.9
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary39w
    Descriptive Headingsavg 3.2w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    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.
    B
    70/100
    11
    Passed
    3
    Critical
    1
    Warnings
    Images & Alt Text
    15/20
    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
    5/15
    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
    8/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    3 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.
    36/100
    C
    166 mg
    CO₂e / view
    1.3 MB
    Page Weight
    70%
    Cleaner Than
    New Visitor
    189 mg
    vs
    Returning (cached)
    95 mg
    Annual (10K/mo)
    19.9 kg
    Emission Segments
    Data Center
    37 mg
    Network
    40 mg
    Device
    89 mg
    Resource Breakdown
    JavaScript
    342.0 KB
    Images
    899.7 KB
    CSS
    79.7 KB
    HTML
    13.0 KB
    Other
    5.3 KB
    Green Hosting Not Verified
    ALTOS software s.r.o
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A

    Security Score

    86%Very Good
    Interactive

    HTTPS

    No WAF

    42d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    15.04.2026

    Valid Until

    14.07.2026

    Subject Alternative Names (2)

    idu.czwww.idu.cz

    SHA-256 Fingerprint

    73:15:B0:CE:49:68:4C:43:A7:7F:B7:EE:7A:B3:B2:78:99:30:11:23...

    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
    close
    content-encoding
    📦 Gzip(gzip)
    content-language
    cs
    content-length
    13060
    content-security-policy
    upgrade-insecure-requests;
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    98

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (1)

    idu-cz.mail.protection.outlook.com

    Domain Information

    idu.cz

    Domain Age
    17y 3m

    Created

    18.02.2009

    Expires

    17.02.2029

    Last Updated

    14.12.2022

    Registrar

    REG-INTERNET-CZ

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    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
    72/100
    Mobile Friendly2 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...
    Upgrade to view recommendations

    Typography & Readability

    trivia_sans_regular

    WCAG Partial
    72/100
    Readability
    /30
    22/30

    18px · LH 1.50

    Hierarchy
    /20
    18/20

    3.33x ratio

    WCAG
    /25
    17/25

    1:1 min contrast

    Performance
    /25
    15/25

    1 font · 3 req

    Heading Font

    trivia_sans_regular

    Sans60px

    Body Font

    trivia_sans_regular

    Sans18px

    Contrast Ratio

    1:1

    12 issues

    Reading Comfort

    ~40 CPL

    Narrow lines
    60px
    h1
    40px
    h2
    30px
    h3
    18px
    p

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

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

    ❌ Very complex text: Flesch score 19/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 12 elements below WCAG AA threshold (min 1.0:1).

    ⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ Strong hierarchy: Headlines are 3.3x larger than body text.

    AAdobe FontsBuy on MyFontsFlesch 19

    Color Palette

    8 unique colors
    Light
    #ffffff
    Primary· 25.8%
    #8d7149
    Primary· 30.1%
    #254601
    Accent· 21%
    #292a1e
    Secondary· 8.1%
    #675b46
    Secondary· 7.1%
    #e8e2dd
    Secondary· 3.2%
    #9c8364
    Secondary· 2.8%
    #324116
    Secondary· 1.9%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    9 Resources

    8
    Scripts
    1
    Styles
    4
    Async
    2
    Defer

    Top Script Sources

    local(3)googletagmanager.com(2)use.typekit.net(1)google-analytics.com(1)maps.google.com(1)

    Website Identity

    idu.cz

    17 years old
    Location detected: 🇨🇿 Czech Republicvia tld
    REG-INTERNET-CZ📧 Microsoft 365cs

    Social Profiles

    FacebookInstagram

    Sponsored

    Last analyzed: 02 Jun 2026 at 01:14

    Historical Analysis & Change Tracking

    idu.cz Technology Stack - Built With Fancybox, Tailwind CSS, Adobe Fonts (Typekit), Google Analytics, Google Analytics 4 | StackOptic | StackOptic