postaonline.cz

https://postaonline.cz· First analyzed 12 May 2026· Updated 12 May 2026

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postaonline.cz

Mobile

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Hosting Provider

Czech Post IU1

IP Address

193.150.24.138

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS198143

Organization

Czech Post IU1

Nameservers

dns1.cpost.cz.dns3.cpost.cz.dns4.cpost.cz.dns2.cpost.cz.

Performance

Core Web Vitals

Weight

First Contentful Paint

850 ms10%

Speed Index

1.1 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.4 MB

50 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Czech Post IU1

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

D55/100

Meta Tags10/15

Content8/12

Headings0/8

Technical19/25

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

postaonline.czpostaonline.cz

PoštaOnline - Česká pošta, s.p.

Webové stránky PoštaOnline nabízí online služby České pošty, včetně užitečných online nástrojů.

Title Length31 chars

Recommended: 50-60 chars (~184px / 580px)

Description Length95 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (5/6) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

298 URLs

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

10/100

Poor

3 13 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

F37/100

Bot Access

20/25

Machine Read.

7/25

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.txtinvalid

llms-full.txt

Semantic HTML

Heading Hierarchy

header/footer

Text ratio:5%

Words:288

Token eff.:Too Short

Sections/1K:3.5

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary36w

Descriptive Headings

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...

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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.

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

11/20

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.

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.

8/100

427 mg

CO₂e / view

3.4 MB

Page Weight

15%

Cleaner Than

New Visitor

487 mg

Returning (cached)

244 mg

Annual (10K/mo)

51.2 kg

Emission Segments

Data Center

95 mg

Network

102 mg

Device

229 mg

Resource Breakdown

JavaScript

1.1 MB

Images

1.7 MB

CSS

583.3 KB

HTML

26.7 KB

Green Hosting Not Verified

Czech Post IU1

8 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Interactive

HTTPS

No WAF

190d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

04.05.2026

Valid Until

18.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (14)

ceskaposta.czamex.postaonline.czb2b.postaonline.czcentralni-adresa.czcentralniadresa.czcgw.postaonline.czmgi.ceskaposta.czmojeposta.ceskaposta.cz+6 more

SHA-256 Fingerprint

18:64:F6:7B:74:1D:D7:19:87:C5:82:43:03:0B:49:47:21:34:38:E7...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

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

content-security-policy

frame-ancestors 'self'

content-type

text/html;charset=UTF-8

date

Tue, 12 May 2026 10:26:20 GMT

expires

Thu, 01 Jan 1970 00:00:00 GMT

pragma

no-cache

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

smtp02.cpost.cz

smtp01.cpost.cz

Domain Information

postaonline.cz

Domain Age

15 years

Created

29.04.2011

Expires

28.04.2031

Last Updated

16.04.2024

Registrar

REG-ACTIVE24

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

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.

52/100

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

initial-scale=1.0, width=device-width

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica Neue

WCAG Partial

65/100

Readability

/30

18/30

14px · LH 1.40

Hierarchy

/20

9/20

WCAG

/25

19/25

1.13:1 min contrast

Performance

/25

19/25

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

1.13:1

1 issue

Reading Comfort

~38 CPL

Narrow lines

18px

14px

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

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

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

✅ System fonts: Zero font loading delay — best possible LCP impact.

Color Palette

13 unique colors

9.7:1 AAA Light

#fbfbfb

Background· 11.3%

#414246

Text· 7.8%

#f6f18c

Accent· 18.4%

#fdc72f

Primary· 14.6%

#3f526e

Secondary· 10%

#1e344d

Secondary· 6.9%

#b3ad8a

Secondary· 6.6%

#a18a73

Secondary· 5.5%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

postaonline.cz(10)local(10)

Website Identity

postaonline.cz

15 years old

Location detected: 🇨🇿 Czech Republicvia tld

REG-ACTIVE24cs-CZ

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Last analyzed: 12 May 2026 at 10:26

Historical Analysis & Change Tracking