biolib.cz

https://biolib.cz· First analyzed 03 May 2026· Updated 03 May 2026

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biolib.cz

Mobile

Sponsored

Hosting Provider

Tcnet

IP Address

185.4.203.23

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Černošice, Czechia

ASN

AS44002

Organization

Tcnet

Nameservers

ns2.mudrc.net.ns.mudrc.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

271 ms10%

Speed Index

352 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1 KB

1 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Tcnet

SEO Analysis

F35/100

Meta Tags4/15

Content4/12

Headings8/8

Technical10/25

E-E-A-T0/7

Images0/7

Links0/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability0/3

biolib.czbiolib.cz

Bezpečnostní kontrola

No description available for this page.

Title Length21 chars

Recommended: 50-60 chars (~128px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Page is set to noindex — will not appear in search results

13 issues found

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Crawlability

Sitemap

Type: index

41 URLs

41 sub-sitemaps

robots.txt

82 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

2/100

Poor

1 14 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

F32/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

2/25

AI Bot Access

13/14 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

Text ratio:19%

Words:66

Token eff.:Too Short

Sections/1K:10

Structured Data

No Schema

Citation Readiness

Opening Summary15w

Descriptive Headingsavg 4w

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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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.

71/100

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

1/15

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.

61/100

A+

<0.001 g

CO₂e / view

1.5 KB

Page Weight

95%

Cleaner Than

New Visitor

<0.001 g

Returning (cached)

<0.001 g

Annual (10K/mo)

24 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

<0.001 g

Resource Breakdown

HTML

1.5 KB

Green Hosting Not Verified

Tcnet

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

66%Fair

Interactive

HTTPS

No WAF

88d

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/2

Valid From

02.05.2026

Valid Until

31.07.2026

Subject Alternative Names (6)

biolib.czmapovani.biolib.czmapreport.biolib.czpaleo.biolib.czpaleomap.biolib.czwww.biolib.cz

SHA-256 Fingerprint

3C:E5:8C:3E:60:63:8C:E4:F3:71:3E:F4:E5:65:A3:91:42:23:BC:61...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

https://biolib.cz

allow

GET, POST

cache-control

🟡 0s(max-age=0)

content-encoding

📦 Gzip(gzip)

content-length

1196

content-security-policy-report-only

default-src 'self' 'unsafe-inline' 'unsafe-eval' data: code....

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

ns2.mudrc.net

ns.mudrc.net

Domain Information

biolib.cz

Domain Age

23y 7m

Created

19.09.2002

Expires

18.09.2026

Last Updated

27.10.2008

Registrar

REG-WEBGLOBE

DNSSEC

Not Enabled

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.

58/100

Mobile Friendly

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, shrink-to-fit=no

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

verdana

WCAG AAA

79/100

Readability

/30

22/30

16px · LH --

Hierarchy

/20

19/20

2x ratio · ✓ H1→H6

WCAG

/25

24/25

8.59:1 min contrast

Performance

/25

14/25

1 font

Heading Font

verdana

Sans32px

Body Font

verdana

Sans16px

Contrast Ratio

8.59:1

WCAG AAA (≥7:1)

Reading Comfort

~41 CPL

Narrow lines

32px

24px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 8.6:1).

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

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

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

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

Buy on MyFontsFlesch 54

Color Palette

7 unique colors

Light

#8bb7ff

Primary· 93.60000000000002%

#495f8a

Secondary· 1.4%

#728fc1

Secondary· 1.2%

#5b78ac

Secondary· 1.2%

#81a8e8

Accent· 1.1%

#1c2438

Secondary· 1%

#abccf7

Accent· 0.6%

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Website Identity

biolib.cz

biolib@biolib.cz

23 years old

Location detected: 🇨🇿 Czech Republicvia tld

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Last analyzed: 03 May 2026 at 08:35

Historical Analysis & Change Tracking