osel.cz

https://osel.cz· First analyzed 15 May 2026· Updated 15 May 2026

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osel.cz

Mobile

Sponsored

Hosting Provider

ZONER software, a.s.

IP Address

217.198.116.183

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS34222

Organization

ZONER software, a.s.

Server

Apache

Nameservers

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

Performance

Core Web Vitals

Weight

First Contentful Paint

715 ms10%

Speed Index

930 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

482 KB

97 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

ZONER software, a.s.

Technology Stack

14 Technologies Detected

Advertising

Google Ads Google AdSense Criteo Outbrain

Analytics

Google Analytics

Facebook Pixel Segment

Libraries

UI Components

CSS Frameworks

Icon Libraries

Fonts

Payments

Web Servers

SEO Analysis

D45/100

Meta Tags4/15

Content10/12

Headings6/8

Technical8/21

E-E-A-T3/7

Images1/7

Links2/5

URL5/5

Social0/5

Freshness0/4

Mobile3/4

Indexability3/3

osel.czosel.cz

:: OSEL.CZ ::

No description available for this page.

Title Length13 chars

Recommended: 50-60 chars (~72px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Most images missing alt text (54/55) — critical for accessibility and SEO

15 issues found

Upgrade to view details

Local SEO

Local Search Readiness

0/100

Poor

15 2

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

Sponsored

AI & LLM Readiness

F26/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

0/25

Citation

5/25

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:15%

Words:12,937

Token eff.:Excessive

Structured Data

No Schema

Citation Readiness

Opening Summary13w

Descriptive Headingsavg 5.7w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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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.

56/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

9/20

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

Forms & Inputs

10/15

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.

4 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.

42/100

60 mg

CO₂e / view

482.1 KB

Page Weight

90%

Cleaner Than

New Visitor

68 mg

Returning (cached)

34 mg

Annual (10K/mo)

7.2 kg

Emission Segments

Data Center

13 mg

Network

14 mg

Device

32 mg

Resource Breakdown

JavaScript

452.4 KB

Images

3.0 KB

Fonts

7.1 KB

HTML

19.7 KB

Green Hosting Not Verified

ZONER software, a.s.

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

289d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

30.01.2026

Valid Until

28.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

osel.czwww.osel.cz

SHA-256 Fingerprint

28:A2:62:3F:FD:FA:EC:58:82:DC:50:90:E6:FB:C5:D8:54:F7:04:AD...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

content-encoding

📦 Gzip(gzip)

content-length

19836

content-type

text/html; charset=UTF-8

date

Fri, 15 May 2026 10:58:49 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (3)

relay.zoner.com

10mx.zoner.com

15mx.zoner.com

Domain Information

osel.cz

Domain Age

24y 6m

Created

16.11.2001

Expires

16.11.2028

Last Updated

03.05.2019

Registrar

REG-ZONER

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

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.

62/100

Mobile Friendly11 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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Open Sans + Helvetica

WCAG Partial

62/100

Readability

/30

14/30

12px · LH 1.33

Hierarchy

/20

17/20

1.5x ratio · ✓ H1→H6

WCAG

/25

17/25

1:1 min contrast

Performance

/25

14/25

3 fonts · 4 req

Heading Font

Open Sans

Sans18px

Body Font

Helvetica

Sans12px

Contrast Ratio

1:1

2 issues

Reading Comfort

~39 CPL

Narrow lines

18px

14px

12px

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Tight line spacing (1.33). Increase to 1.4–1.6 for better readability.

⚠️ Hard to read: Flesch score 42/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

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

GGoogle FontsFlesch 42

Color Palette

6 unique colors

5.74:1 AA Dark

#666666

Other· 40.199999999999996%

#ffffff

Background· 23.7%

#12151a

Primary· 22.5%

#3567ab

Accent· 1.3%

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

pagead2.googlesyndication.com(6)osel.cz(5)fundingchoicesmessages.google.com(3)connect.facebook.net(2)google-analytics.com(1)

Website Identity

osel.cz

24 years old

Location detected: 🇨🇿 Czech Republicvia tld

REG-ZONER

Social Profiles

Facebook

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Last analyzed: 15 May 2026 at 10:59

Historical Analysis & Change Tracking