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calc.ru

https://calc.ru· First analyzed 06 May 2026· Updated 06 May 2026
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calc.ru
Desktop screenshot of calc.ru
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Mobile

Sponsored

Hosting Provider

AOIOT

IP Address

78.24.223.187

Site Location

🇷🇺 Russiavia tld

Server Location

🇷🇺 Novoivanovskoye, Russia

ASN

AS29182

Organization

AOIOT

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

elle.ns.cloudflare.com.zod.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
555 ms10%
Speed Index
722 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
293 KB
58 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
AOIOT
CDN
Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

Libraries

1
jQueryv1.8.3

Advertising

1
Google AdSense

Web Servers

1
Nginxv1.20.2

Languages

1
PHPv5.4.16

SEO Analysis

C65/100
16
10
0
Meta Tags12/15
Content11/12
Headings7/8
Technical17/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
C
calc.rucalc.ru

Калькуляторы онлайн, справочник-энциклопедия

Калькуляторы онлайн, справочник-энциклопедия. Бесплатные онлайн калькуляторы расчета, перевода, отслеживания курсов и котировок. Сотни калькуляторов, тысячи ...

Description truncated.
Title Length44 chars

Recommended: 50-60 chars (~270px / 580px)

Description Length245 chars

Recommended: 120-160 chars

Issues (0)

    10 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    134 URLs

    134 sub-sitemaps

    robots.txt

    18 rules

    Local SEO

    Local Search Readiness

    3/100
    Poor
    1 14 2

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

    Sponsored

    AI & LLM Readiness

    F28/100
    Bot Access
    20/25
    Machine Read.
    1/25
    Schema Data
    0/25
    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:8%
    Words:9,576
    Token eff.:Excessive
    Sections/1K:0.1

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary
    Descriptive Headingsavg 2w
    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

    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.
    C
    66/100
    8
    Passed
    4
    Critical
    1
    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
    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.
    2 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.
    53/100
    A+
    36 mg
    CO₂e / view
    293.4 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    42 mg
    vs
    Returning (cached)
    21 mg
    Annual (10K/mo)
    4.4 kg
    Emission Segments
    Data Center
    8 mg
    Network
    9 mg
    Device
    20 mg
    Resource Breakdown
    JavaScript
    241.5 KB
    Images
    343 B
    HTML
    49.2 KB
    Other
    2.4 KB
    Green Hosting Not Verified
    AOIOT
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    36%Critical
    Interactive

    HTTPS

    No WAF

    57d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/1.1

    Valid From

    04.04.2026

    Valid Until

    03.07.2026

    Subject Alternative Names (4)

    calc.rucdn.calc.ruisp.calc.ruwww.calc.ru

    SHA-256 Fingerprint

    EC:05:AF:29:CE:B2:D2:A9:CD:94:B1:34:70:32:82:F7:0F:E4:63:62...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)
    connection
    keep-alive
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=windows-1251
    date
    Wed, 06 May 2026 17:12:20 GMT
    expires
    Thu, 19 Nov 1981 08:52:00 GMT
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (7)

    aspmx3.googlemail.com
    aspmx4.googlemail.com
    aspmx.l.google.com
    aspmx5.googlemail.com

    +3 more

    Domain Information

    calc.ru

    Domain Age
    25y 6m

    Created

    25.10.2000

    Expires

    26.10.2026

    Registrar

    RU-CENTER-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.
    D
    59/100
    Mobile Friendly2 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=1024
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Verdana

    WCAG Partial
    58/100
    Readability
    /30
    11/30

    12px · LH --

    Hierarchy
    /20
    13/20

    2x ratio

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    18/25

    1 font · 1 req

    Heading Font

    Verdana

    Sans24px

    Body Font

    Verdana

    Sans12px

    Contrast Ratio

    1:1

    36 issues

    Reading Comfort

    ~36 CPL

    Narrow lines
    24px
    h1
    25px
    h2
    20px
    h4
    12px
    p

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

    ⚠️ Partial contrast: 36 elements below WCAG AA threshold (min 1.0:1).

    ⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

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

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

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

    Buy on MyFonts

    Color Palette

    5 unique colors
    Light
    #ffffff
    Primary· 49.9%
    #e9f8ff
    Background· 30.5%
    #8db5bb
    Secondary· 7.3%
    #abd7e5
    Accent· 7.2%
    #cce1e7
    Secondary· 5.2%

    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

    Ad Networks

    Google AdSense

    Sponsored

    Scripts & Styles

    15 Resources

    14
    Scripts
    1
    Styles
    8
    Async
    1
    Defer

    Top Script Sources

    calc.ru(3)cdn.calc.ru(3)local(2)yandex.ru(2)mc.yandex.ru(1)

    Website Identity

    calc.ru

    25 years old
    Location detected: 🇷🇺 Russiavia tld
    RU-CENTER-RU📧 Google Workspaceru

    Sponsored

    Last analyzed: 06 May 2026 at 17:12

    Historical Analysis & Change Tracking