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sibran.ru

https://sibran.ru· First analyzed 14 May 2026· Updated 14 May 2026
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sibran.ru
Desktop screenshot of sibran.ru
Mobile screenshot of sibran.ru
Mobile

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Hosting Provider

IHC

IP Address

5.35.100.211

Site Location

🇷🇺 Russiavia tld

Server Location

🇷🇺 Moscow, Russia

ASN

AS210079

Organization

IHC

Server

Nginx

Nameservers

ns2.ihc.ru.ns1.ihc.ru.

Performance

94

Core Web Vitals

Weight

First Contentful Paint
1.2 s10%
Speed Index
1.5 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
520 KB
51 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
IHC

Technology Stack

3 Technologies Detected

Libraries

1
jQueryv1.8.3

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

SEO Analysis

D51/100
12
10
2
Meta Tags7/15
Content9/12
Headings3/8
Technical13/21
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
S
sibran.rusibran.ru

Главная

Научные журналы, полные тексты статей, научные книги, разработки ученых СО РАН

Title Length7 chars

Recommended: 50-60 chars (~43px / 580px)

Description Length78 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

12 issues found

Upgrade to view details

Local SEO

Local Search Readiness

6/100
Poor
2 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

F37/100
Bot Access
20/25
Machine Read.
9/25
Schema Data
1/25
Citation
7/25

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:10%
Words:383
Token eff.:Optimal
Sections/1K:7.8

Structured Data

Microdata
Product(min)microdata

Citation Readiness

Opening Summary12w
Descriptive Headingsavg 2.7w
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...
Upgrade to view recommendations

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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.
D
56/100
7
Passed
5
Critical
1
Warnings
Images & Alt Text
10/20
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
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
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...
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.
49/100
A
64 mg
CO₂e / view
519.7 KB
Page Weight
80%
Cleaner Than
New Visitor
74 mg
vs
Returning (cached)
37 mg
Annual (10K/mo)
7.7 kg
Emission Segments
Data Center
14 mg
Network
15 mg
Device
35 mg
Resource Breakdown
JavaScript
289.5 KB
Images
208.7 KB
CSS
13.1 KB
HTML
8.5 KB
Green Hosting Not Verified
IHC
5 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

54d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.04.2026

Valid Until

08.07.2026

Subject Alternative Names (4)

journals.sibran.rusibran.ruwww.journals.sibran.ruwww.sibran.ru

SHA-256 Fingerprint

FE:57:D9:3D:B1:3D:76:49:20:F1:F7:83:70:22:1D:E0:9C:BE:2F:39...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-headers
DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Cont...
access-control-allow-methods
GET, POST, OPTIONS
access-control-allow-origin
*
access-control-expose-headers
Content-Length,Content-Range
cache-control
🔴 No Cache(no-store, no-cache, must-revalidate)
content-encoding
📦 Gzip(gzip)
Good Warning Issue

Email Infrastructure

Yandex Mail

Score

45

SPF
DKIM
DMARC

MX Records (2)

mx.yandex.net
mail.sibran.ru

Domain Information

sibran.ru

Domain Age
18y 8m

Created

30.08.2007

Expires

30.08.2026

Registrar

REGTIME-RU

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.
F
29/100
Not 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.
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Arial

WCAG Partial
65/100
Readability
/30
18/30

13px · LH 1.54

Hierarchy
/20
11/20

0.92x ratio · ✓ H1→H6

WCAG
/25
16/25

4:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

Arial

Sans12px

Body Font

Arial

Sans13px

Contrast Ratio

4:1

2 issues

Reading Comfort

~63 CPL

Optimal (45–75)
12px
h1
20px
h2
13px
p
Major Sixth
Scale

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.54 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~63 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 4.0:1).

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

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

Color Palette

8 unique colors
2.35:1 Fail Light
#ffffff
Background· 50.9%
#a6a9b2
Other· 6.8%
#d5dce4
Secondary· 16.1%
#2e64a4
Primary· 10.2%
#ecf4f8
Primary· 8.6%
#597b9f
Secondary· 2.7%
#5c5777
Secondary· 1.8%

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

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Scripts & Styles

17 Resources

13
Scripts
4
Styles
4
Async
0
Defer

Top Script Sources

local(9)st.top100.ru(2)mc.yandex.ru(2)

Website Identity

sibran.ru

asd@sibran.ru
18 years old
Location detected: 🇷🇺 Russiavia tld
REGTIME-RU📧 Yandex Mailru

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Last analyzed: 14 May 2026 at 11:40

Historical Analysis & Change Tracking