StackOptic
Back to Search
0calc.com favicon

0calc.com

https://0calc.com· First analyzed 09 May 2026· Updated 09 May 2026
Export
0calc.com
Desktop screenshot of 0calc.com
Mobile screenshot of 0calc.com
Mobile

Sponsored

Hosting Provider

Hetzner
hetzner.com

IP Address

168.119.251.111

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Falkenstein, Germany

ASN

AS24940

Organization

Hetzner

Server

Nginx

Nameservers

oxygen.ns.hetzner.com.helium.ns.hetzner.de.hydrogen.ns.hetzner.com.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
706 ms10%
Speed Index
918 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
509 KB
51 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Hetzner

Technology Stack

5 Technologies Detected

Advertising

2
Google AdsGoogle AdSense

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

Web Servers

1
Nginx

SEO Analysis

C61/100
18
9
0
Meta Tags7/15
Content6/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social2/5
Freshness0/4
Mobile2/4
Indexability3/3
0
0calc.com0calc.com

Web 2.0 scientific calculator

Free Online Scientific Notation Calculator. Solve advanced problems in Physics, Mathematics and Engineering. Math Expression Renderer, Plots, Unit Converter,...

Description truncated.
Title Length29 chars

Recommended: 50-60 chars (~169px / 580px)

Description Length212 chars

Recommended: 120-160 chars

Issues (0)

    9 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    10,081 URLs

    robots.txt

    11 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    8/100
    Poor
    3 12 2

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

    Sponsored

    AI & LLM Readiness

    F35/100
    Bot Access
    19/25
    Machine Read.
    8/25
    Schema Data
    0/25
    Citation
    8/25

    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.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    nav
    Text ratio:1%
    Words:766
    Token eff.:Optimal
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary
    Descriptive Headings
    Canonical URL
    Open Graph1/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    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
    67/100
    10
    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
    8/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    13/15
    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
    7/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    4/15
    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.
    61/100
    A
    51 mg
    CO₂e / view
    508.8 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    59 mg
    vs
    Returning (cached)
    29 mg
    Annual (10K/mo)
    6.2 kg
    Emission Segments
    Data Center
    3 mg
    Network
    15 mg
    Device
    34 mg
    Resource Breakdown
    JavaScript
    374.9 KB
    Images
    40.2 KB
    CSS
    34.9 KB
    Fonts
    26.0 KB
    HTML
    9.1 KB
    Other
    23.7 KB
    Green Hosting Verified
    Hetzner Online GmbH
    GWF Verified
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    No WAF

    50d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    30.03.2026

    Valid Until

    28.06.2026

    Subject Alternative Names (5)

    0calc.comapi.web2.0calc.comweb2.0calc.comwww.0calc.comwww.web2.0calc.com

    SHA-256 Fingerprint

    5A:23:64:78:7E:7B:3F:77:5A:C5:D6:8A:F4:7A:E7:A0:2D:28:8D:77...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔴 No Cache(no-cache)
    content-encoding
    📦 Gzip(gzip)
    content-length
    9046
    content-type
    text/html;charset=utf-8
    date
    Sat, 09 May 2026 12:40:05 GMT
    expires
    Thu, 01 Jan 1970 00:00:00 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    0calc.com

    Domain Age
    17y 4m

    Created

    14.12.2008

    Expires

    14.12.2026

    Last Updated

    15.12.2025

    Registrar

    OVH sas

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    Privacy policy page linked

    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.
    C
    63/100
    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.
    Viewport
    width=device-width, initial-scale=1.0
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Helvetica + Helvetica Neue

    WCAG Partial
    67/100
    Readability
    /30
    21/30

    14px · LH 1.43

    Hierarchy
    /20
    12/20

    2x ratio · ✓ H1→H6

    WCAG
    /25
    16/25

    2.46:1 min contrast

    Performance
    /25
    18/25

    System fonts

    Heading Font

    Helvetica

    Sans28px

    Body Font

    Helvetica Neue

    Sans14px

    Contrast Ratio

    2.46:1

    6 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    28px
    h1
    30px
    h2
    20px
    h3
    16px
    h4
    14px
    p

    ⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

    ✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

    ⚠️ Hard to read: Flesch score 32/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 6 elements below WCAG AA threshold (min 2.5:1).

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

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

    GGoogle FontsBuy on MyFontsFlesch 32

    Color Palette

    4 unique colors
    Light
    #e0e2e4
    Other· 13.9%
    #2f3945
    Primary· 69.9%
    #768595
    Secondary· 3.4%

    Business & Marketing Stack

    2 Tools Detected

    Advanced

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    1
    Google AdsEnterprise

    Ad platforms and retargeting pixels

    2

    Categories

    2

    Total Tools

    1

    Enterprise

    0

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Ad Networks

    Google AdSense

    Sponsored

    Scripts & Styles

    15 Resources

    10
    Scripts
    5
    Styles
    6
    Async
    0
    Defer

    Top Script Sources

    fundingchoicesmessages.google.com(5)local(3)pagead2.googlesyndication.com(2)

    Website Identity

    0calc.com

    britnex@gmail.com
    17 years old
    Location detected: 🇩🇪 Germanyvia ip
    OVH sasen

    Social Profiles

    Facebook

    Sponsored

    Last analyzed: 09 May 2026 at 12:40

    Historical Analysis & Change Tracking