calcus.ru
Онлайн калькулятор — calcus.ru
Last scanned Aug 24, 2026, 1:22 PM
Overall score
Fair
Summary
Встроенный онлайн-калькулятор на Calcus.ru: арифметические и научные вычисления, тригонометрические функции, логарифмы, ст�… This website uses Nginx hosted on EUROBYTE - EuroByte LLC, RU. SEO is good (80/100) and accessibility is fair (70/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
Встроенный онлайн-калькулятор на Calcus.ru: арифметические и научные вычисления, тригонометрические функции, логарифмы, степени и корни — прямо в браузере.
- Russia
- Hosted on EUROBYTE - EuroByte LLC, RU
Top issues to fix
11 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
TLS certificate expires in 28 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
+5 more issues — details in the sections below.
SEO
3 issue(s) found
Performance
317 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Встроенный онлайн-калькулятор на Calcus.ru: арифметические и научные вычисления, тригонометрические функции, логарифмы, степени и корни — прямо в браузере.
Meta tags
- Title
- Онлайн калькулятор — calcus.ru
- Description
- Встроенный онлайн-калькулятор на Calcus.ru: арифметические и научные вычисления, тригонометрические функции, логарифмы, степени и корни — прямо в браузере.
- Canonical
- https://calcus.ru/
- Language
- ru
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0,maximum-scale=1,user-scalable=no
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- EUROBYTE - EuroByte LLC, RU
- CDN provider
- —
- IP address
- 130.49.173.84
- ASN
- AS210079 (EUROBYTE - EuroByte LLC, RU)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- GlobalSign nv-sa
- Subject
- www.calcus.ru
- Valid from
- Aug 21, 2025
- Valid to
- Sep 22, 2026
- Days until expiry
- 28
- SAN domains
- www.calcus.ru, calcus.ru
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 2 · H3 0
Links
74 internal · 0 external · 15 broken
Images
1 total · 1 missing alt
Scripts / Styles
8 scripts · 2 stylesheets
JS / CSS size
535 KB · 213 KB
Page size
118 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 43
- sitemap.xml
- Found
- URLs in sitemap
- 193
SEO issues
- Meta description longer than 160 characters
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
- Over half of images are missing alt text
Scan details
- Requested URL
- https://calcus.ru
- Final URL
- https://calcus.ru
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 315 ms
- HTML size
- 118 KB
- Redirect chain
- https://calcus.ru
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does calcus.ru use?
- calcus.ru is built with PHP, Google Analytics, Nginx.
- Is calcus.ru secure (HTTPS)?
- Yes. calcus.ru uses TLS 1.2 with a certificate issued by GlobalSign nv-sa, valid until Sep 22, 2026.
- Who hosts calcus.ru?
- calcus.ru is hosted on EUROBYTE - EuroByte LLC, RU.
- What is calcus.ru's SEO score?
- calcus.ru scored 80/100 for SEO in the latest analysis (great).
- What is calcus.ru's overall website score?
- calcus.ru has an overall SiteGraph score of 79/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card