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medcalc.org

https://medcalc.org· First analyzed 14 May 2026· Updated 14 May 2026
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medcalc.org
Desktop screenshot of medcalc.org
Mobile screenshot of medcalc.org
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.21.22.17

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

emerson.ns.cloudflare.com.simone.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
590 ms10%
Speed Index
767 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
70 KB
23 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

2 Technologies Detected

Fonts

1
Google Fonts

CDN

1
Cloudflare

SEO Analysis

A85/100
28
3
0
Meta Tags13/15
Content8/12
Headings8/8
Technical21/25
E-E-A-T7/7
Images5/7
Links4/5
URL5/5
Social3/5
Freshness4/4
Mobile4/4
Indexability3/3
M
medcalc.orgmedcalc.org

MedCalc Statistical Software – Data Analysis & Graphing

MedCalc is a powerful statistical software package for biomedical research. Features include industry-leading ROC curve analysis, method comparison, and clin...

Description truncated.
Title Length55 chars

Recommended: 50-60 chars (~334px / 580px)

Description Length201 chars

Recommended: 120-160 chars

Issues (0)

    3 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    1,538 URLs

    robots.txt

    2 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    14/100
    Poor
    4 13 1

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

    Sponsored

    AI & LLM Readiness

    D54/100
    Bot Access
    20/25
    Machine Read.
    12/25
    Schema Data
    5/25
    Citation
    17/25

    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:11%
    Words:351
    Token eff.:Optimal
    Sections/1K:25.6
    Depth:1/5

    Structured Data

    1 JSON-LD
    Person×1.3Organization×1.1

    Citation Readiness

    Opening Summary13w
    Descriptive Headingsavg 4.3w
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    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.
    A
    82/100
    12
    Passed
    2
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    18/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    12/15
    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
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    6/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 recommendations
    • •Accessibility recommendation preview...
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    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.
    72/100
    A+
    7 mg
    CO₂e / view
    69.9 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    8 mg
    vs
    Returning (cached)
    4 mg
    Annual (10K/mo)
    852 g
    Emission Segments
    Data Center
    <0.001 g
    Network
    2 mg
    Device
    5 mg
    Resource Breakdown
    JavaScript
    3.8 KB
    Images
    51.6 KB
    CSS
    5.1 KB
    Fonts
    2.2 KB
    HTML
    7.2 KB
    Green Hosting Verified
    Cloudflare
    GWF Verified
    4 recommendations
    • •Carbon footprint recommendation preview...
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    D

    Security Score

    51%Poor
    Interactive

    HTTPS

    WAF

    69d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Google Trust Services

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    24.04.2026

    Valid Until

    23.07.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    medcalc.org*.medcalc.org

    SHA-256 Fingerprint

    2C:71:8F:FC:5A:F9:C9:D7:9E:71:7F:23:13:6F:F6:84:65:DF:88:7E...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400
    cache-control
    🟡 1 Hours(max-age=3600)
    cf-cache-status
    EXPIRED
    cf-ray
    9fbcf4d5c8f38fb1-BOS
    content-encoding
    zstd
    content-type
    text/html; charset=UTF-8
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    93

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (1)

    medcalc-org.mail.protection.outlook.com

    Domain Information

    medcalc.org

    Domain Age
    24y 11m

    Created

    18.06.2001

    Expires

    18.06.2029

    Last Updated

    08.06.2024

    Registrar

    GoDaddy.com, LLC

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    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.
    B
    72/100
    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

    Typography & Readability

    Arial

    WCAG AA
    77/100
    Readability
    /30
    22/30

    16px · LH 1.40

    Hierarchy
    /20
    13/20

    1.4x ratio · ✓ H1→H6

    WCAG
    /25
    22/25

    6.25:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    Arial

    Sans22px

    Body Font

    Arial

    Sans16px

    Contrast Ratio

    6.25:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~34 CPL

    Narrow lines
    22px
    h1
    21px
    h2
    16px
    p

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

    ✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

    ❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 6.2:1).

    ✅ 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.

    GGoogle FontsFlesch 0

    Color Palette

    5 unique colors
    2.96:1 Fail Light
    #ffffff
    Background· 84.39999999999999%
    #9196a2
    Secondary· 3.6%
    #003f70
    Primary· 0%
    #d4e6f7
    Primary· 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

    Sponsored

    Scripts & Styles

    6 Resources

    2
    Scripts
    4
    Styles
    0
    Async
    1
    Defer

    Top Script Sources

    local(1)static.cloudflareinsights.com(1)

    Website Identity

    MedCalc Statistical Software – Data Analysis & Graphing

    article

    MedCalc is a powerful statistical software package for biomedical research. Features include industry-leading ROC curve analysis, method comparison, and clinical quality control. Download a free trial.

    24 years old
    Location detected: 🇨🇦 Canadavia ip
    GoDaddy.com, LLC📧 Microsoft 365en

    Sponsored

    Last analyzed: 14 May 2026 at 21:22

    Historical Analysis & Change Tracking