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chem21.info

https://chem21.info· First analyzed 01 Jun 2026· Updated 01 Jun 2026
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chem21.info
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Mobile

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Hosting Provider

Miran

IP Address

185.162.92.50

Site Location

🇷🇺 Russiavia ip

Server Location

🇷🇺 St Petersburg, Russia

ASN

AS41722

Organization

Miran

Server

Apache

Nameservers

ns2.reg.ru.ns1.reg.ru.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
591 ms10%
Speed Index
768 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
108 KB
27 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Miran

Technology Stack

3 Technologies Detected

Analytics

2
Google Analytics
Segment

Web Servers

1
Apachev2.4.29

SEO Analysis

D45/100
13
7
3
Meta Tags4/15
Content7/12
Headings6/8
Technical11/25
E-E-A-T0/7
Images1/7
Links4/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
C
chem21.infochem21.info

Абагян - Абгазная соляная кислота для разложения марганцевых - Спра...

No description available for this page.

Title truncated.
Title Length83 chars

Recommended: 50-60 chars (~512px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

  • • Title is too long (83 chars, ~512px). Will be truncated in search results.
  • • Missing meta description — important for click-through rates in SERPs
  • • Most images missing alt text (1/1) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

3 rules

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.

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AI & LLM Readiness

F32/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
0/25
Citation
4/25

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:14%
Words:236
Token eff.:Too Short
Sections/1K:4.2
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary19w
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 (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.
C
67/100
8
Passed
4
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
15/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
7/15
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.
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.
57/100
A+
13 mg
CO₂e / view
108.3 KB
Page Weight
95%
Cleaner Than
New Visitor
15 mg
vs
Returning (cached)
8 mg
Annual (10K/mo)
1.6 kg
Emission Segments
Data Center
3 mg
Network
3 mg
Device
7 mg
Resource Breakdown
JavaScript
99.4 KB
CSS
5.5 KB
HTML
3.4 KB
Green Hosting Not Verified
Miran
5 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

31%Critical
Interactive

HTTPS

No WAF

22d

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

26.03.2026

Valid Until

24.06.2026

Subject Alternative Names (1)

chem21.info

SHA-256 Fingerprint

11:62:7F:B7:2A:E8:95:BA:1C:A4:D6:6B:C5:2B:7D:F9:0F:A9:BE:F8...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection
close
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=utf-8
date
Mon, 01 Jun 2026 09:39:03 GMT
server
Apache/2.4.29 (Ubuntu)
transfer-encoding
chunked
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

chem21.info

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.
D
52/100
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
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Cambria

WCAG Partial
66/100
Readability
/30
16/30

15px · LH --

Hierarchy
/20
14/20

2.4x ratio

WCAG
/25
16/25

2.32:1 min contrast

Performance
/25
20/25

1 font · 1 req

Heading Font

Cambria

Serif36px

Body Font

Cambria

Serif15px

Contrast Ratio

2.32:1

6 issues

Reading Comfort

~123 CPL

Too wide
36px
h1
14px
h2
15px
p

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

❌ Very long lines: ~123 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 6 elements below WCAG AA threshold (min 2.3:1).

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

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

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

Buy on MyFonts

Color Palette

5 unique colors
Light
#ffffff
Background· 95.19999999999999%
#c3c6da
Primary· 1.5%
#7978c2
Secondary· 1.2%
#e4e6e9
Border· 1.1%

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

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Scripts & Styles

4 Resources

3
Scripts
1
Styles
3
Async
0
Defer

Top Script Sources

google-analytics.com(1)yandex.ru(1)yastatic.net(1)

Website Identity

chem21.info

Location detected: 🇷🇺 Russiavia ip

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Last analyzed: 01 Jun 2026 at 09:39

Historical Analysis & Change Tracking