Back to Search
opendata.cz favicon

opendata.cz

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

Sponsored

Hosting Provider

Cloudflare
cloudflare.com

IP Address

172.67.195.212

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

lisa.ns.cloudflare.com.derek.ns.cloudflare.com.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
741 ms10%
Speed Index
963 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
209 KB
15 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Platform
GitHub Pages
CDN
Cloudflare

Technology Stack

8 Technologies Detected

CSS Frameworks

2
Tailwind CSS
Materialize

Analytics

2
Google Analytics
Segment

Libraries

1
jQueryv2.1.1

Icon Libraries

1
Material Icons

Fonts

1
Google Fonts

CDN

1
Cloudflare

SEO Analysis

C63/100
19
8
0
Meta Tags5/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
O
opendata.czopendata.cz

OpenData.cz

OpenData.cz is an initiative for transparent data infrastructure

Title Length11 chars

Recommended: 50-60 chars (~68px / 580px)

Description Length65 chars

Recommended: 120-160 chars

Issues (0)

    8 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    44 URLs

    robots.txt

    1 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    7/100
    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

    D42/100
    Bot Access
    20/25
    Machine Read.
    12/25
    Schema Data
    0/25
    Citation
    10/25

    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:27%
    Words:549
    Token eff.:Optimal
    Sections/1K:9.1
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary63w
    Descriptive Headingsavg 1.2w
    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...
    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
    79/100
    11
    Passed
    3
    Critical
    0
    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
    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...
    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.
    67/100
    A+
    21 mg
    CO₂e / view
    209.1 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    24 mg
    vs
    Returning (cached)
    12 mg
    Annual (10K/mo)
    2.5 kg
    Emission Segments
    Data Center
    1 mg
    Network
    6 mg
    Device
    14 mg
    Resource Breakdown
    JavaScript
    48.7 KB
    Images
    5.7 KB
    CSS
    149.3 KB
    Fonts
    641 B
    HTML
    4.8 KB
    Green Hosting Verified
    Cloudflare
    GWF Verified
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A

    Security Score

    81%Very Good
    Static / Informational

    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

    09.04.2026

    Valid Until

    08.07.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    opendata.cz*.opendata.cz

    SHA-256 Fingerprint

    7B:67:CA:C8:65:67:C2:39:B7:CD:2F:58:2A:54:1E:BC:69:19:68:16...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    age
    0
    alt-svc
    h3=":443"; ma=86400
    cache-control
    🟡 600s(max-age=600)
    cf-cache-status
    DYNAMIC
    cf-ray
    a05304db0af03453-EWR
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (2)

    80a1d6d671ec68ab.mx1.emailprofi.seznam.cz
    80a1d6d671ec68ab.mx2.emailprofi.seznam.cz

    Domain Information

    opendata.cz

    Domain Age
    15y 6m

    Created

    06.12.2010

    Expires

    05.12.2026

    Last Updated

    20.07.2017

    Registrar

    REG-WEBGLOBE

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    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.
    C
    60/100
    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...
    Upgrade to view recommendations

    Typography & Readability

    Roboto

    WCAG Partial
    80/100
    Readability
    /30
    25/30

    25px · LH 1.50

    Hierarchy
    /20
    17/20

    2.5x ratio · ✓ H1→H6

    WCAG
    /25
    17/25

    1.45:1 min contrast

    Performance
    /25
    21/25

    System fonts

    Heading Font

    Roboto

    Sans63px

    Body Font

    Roboto

    Sans25px

    Contrast Ratio

    1.45:1

    28 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    63px
    h1
    53px
    h2
    44px
    h3
    34px
    h4
    25px
    p

    ✅ Excellent readability: 25px body text is ideal for all devices.

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

    ❌ Very complex text: Flesch score 20/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 28 elements below WCAG AA threshold (min 1.4:1).

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

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    GGoogle FontsFlesch 20

    Color Palette

    7 unique colors
    Light
    #ffffff
    Background· 80.2%
    #2196f3
    Primary· 7.2%
    #cabeac
    Secondary· 3.7%
    #8ca5b7
    Secondary· 2.5%
    #f5f1e6
    Secondary· 2.3%
    #58839c
    Secondary· 0.8%

    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

    Sponsored

    Scripts & Styles

    10 Resources

    7
    Scripts
    3
    Styles
    3
    Async
    1
    Defer

    Top Script Sources

    google-analytics.com(3)local(2)code.jquery.com(1)static.cloudflareinsights.com(1)

    Website Identity

    opendata.cz

    15 years old
    Location detected: 🇨🇿 Czech Republicvia tld
    REG-WEBGLOBEcs

    Social Profiles

    GitHub

    Sponsored

    Last analyzed: 02 Jun 2026 at 02:27

    Historical Analysis & Change Tracking

    opendata.cz Technology Stack - Built With jQuery, Tailwind CSS, Materialize, Material Icons, Google Fonts | StackOptic | StackOptic