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calculator.tw

https://calculator.tw· First analyzed 31 May 2026· Updated 31 May 2026
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calculator.tw
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Mobile

Sponsored

Hosting Provider

Hetzner
hetzner.com

IP Address

37.27.135.61

Site Location

🇹🇼 Taiwanvia tld

Server Location

🇫🇮 Helsinki, Finland

ASN

AS24940

Organization

Hetzner Online GmbH

Server

BunnyCDN-FR1-1317

CDN

CDN

Nameservers

clara.ns.cloudflare.com.igor.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
572 ms10%
Speed Index
744 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
888 KB
104 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Hetzner
CDN
CDN

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

10 Technologies Detected

Advertising

3
Google AdsGoogle AdSenseCriteo

CSS Frameworks

2
Bootstrapv4.6.2
Tailwind CSS

Analytics

2
MatomoClicky

Libraries

1
jQueryv3.6.0

Icon Libraries

1
Font Awesome

CDN

1
Bunny CDN

SEO Analysis

D59/100
17
7
0
Meta Tags5/15
Content11/12
Headings8/8
Technical19/25
E-E-A-T0/7
Images0/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
C
calculator.twcalculator.tw

免費線上計算機 | Calculator.tw

Calculator.tw 提供多種實用的免費線上計算機。使用我們簡單易用的計算機，簡化您的計算。

Title Length23 chars

Recommended: 50-60 chars (~136px / 580px)

Description Length52 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    2,109 URLs

    robots.txt

    2 rules

    Allows all crawlers

    Local SEO

    Local Search Readiness

    6/100
    Poor
    2 13 2

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

    Sponsored

    AI & LLM Readiness

    D41/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    0/25
    Citation
    10/25

    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
    nav
    Text ratio:2%
    Words:603
    Token eff.:Optimal
    Sections/1K:124.4
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary90w
    Descriptive Headingsavg 1.7w
    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...
    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.
    B
    76/100
    12
    Passed
    2
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    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
    5/15
    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.
    56/100
    B
    90 mg
    CO₂e / view
    888.3 KB
    Page Weight
    80%
    Cleaner Than
    New Visitor
    103 mg
    vs
    Returning (cached)
    51 mg
    Annual (10K/mo)
    10.8 kg
    Emission Segments
    Data Center
    4 mg
    Network
    26 mg
    Device
    59 mg
    Resource Breakdown
    JavaScript
    740.5 KB
    Images
    2.1 KB
    CSS
    44.7 KB
    HTML
    23.1 KB
    Other
    77.9 KB
    Green Hosting Verified
    Hetzner Online GmbH
    GWF Verified
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    21%Critical
    Interactive

    HTTPS

    No WAF

    63d

    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/2

    Valid From

    04.05.2026

    Valid Until

    02.08.2026

    Subject Alternative Names (1)

    calculator.tw

    SHA-256 Fingerprint

    AD:60:15:E2:83:AE:96:22:3D:BE:6C:DD:B5:4C:F4:68:1A:5A:F0:F2...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🟡 0s(public, max-age=0)
    cdn-cache
    HIT
    cdn-cachedat
    05/31/2026 09:17:45
    cdn-edgestorageid
    1316
    cdn-proxyver
    1.55
    cdn-pullzone
    3555749
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (1)

    mail.calculator.tw

    Domain Information

    calculator.tw

    Domain Age
    1y 2m

    Created

    17.03.2025

    Expires

    17.03.2027

    Last Updated

    17.03.2025

    Registrar

    WebCC Ltd.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Quantcast Choice

    Cookie Consent Banner
    Quantcast Choice
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Quantcast Choice

    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.
    B
    79/100
    Mobile Friendly6 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=device-width, initial-scale=1
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    -apple-system

    WCAG Partial
    86/100
    Readability
    /30
    28/30

    16px · LH 1.50

    Hierarchy
    /20
    18/20

    2.5x ratio · ✓ H1→H6

    WCAG
    /25
    18/25

    1.97:1 min contrast

    Performance
    /25
    22/25

    System fonts

    Heading Font

    -apple-system

    Sans40px

    Body Font

    -apple-system

    Sans16px

    Contrast Ratio

    1.97:1

    2 issues

    Reading Comfort

    ~43 CPL

    Narrow lines
    40px
    h1
    32px
    h2
    16px
    h3
    16px
    p

    ✅ Excellent readability: 16px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

    ✅ Easy to read: Flesch score 100/100 — accessible to general audiences.

    ⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 2.0:1).

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

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    Flesch 100

    Color Palette

    8 unique colors
    2.11:1 Fail Light
    #ffffff
    Background· 75.1%
    #b7b1b5
    Other· 3.2%
    #984fa2
    Primary· 4%
    #abcbe8
    Accent· 3.7%
    #7ab1de
    Accent· 2.8%
    #c8d9e8
    Secondary· 2.6%
    #e3e0d9
    Border· 2.1%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    2
    Matomo (Piwik)Mid-Market
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    1
    Google AdsEnterprise

    Ad platforms and retargeting pixels

    2

    Categories

    3

    Total Tools

    1

    Enterprise

    1

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Ad Networks

    Google AdSenseGoogle Ad ManagerAmazon Publisher ServicesPubMaticOpenXPrebid.js

    Sponsored

    Scripts & Styles

    24 Resources

    20
    Scripts
    4
    Styles
    14
    Async
    0
    Defer

    Top Script Sources

    securepubads.g.doubleclick.net(3)pagead2.googlesyndication.com(3)cmp.inmobi.com(2)cdn1.anonymised.io(2)cdn.hadronid.net(1)

    Website Identity

    calculator.tw

    1 year old
    Location detected: 🇹🇼 Taiwanvia tld
    WebCC Ltd.zh-tw

    Sponsored

    Last analyzed: 31 May 2026 at 10:37

    Historical Analysis & Change Tracking

    calculator.tw Technology Stack - Built With jQuery, Bootstrap, Tailwind CSS, Font Awesome, Matomo | StackOptic | StackOptic