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whocanuse.com

https://whocanuse.com· First analyzed 24 May 2026· Updated 24 May 2026
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whocanuse.com
Desktop screenshot of whocanuse.com
Mobile screenshot of whocanuse.com
Mobile

Sponsored

Hosting Provider

Vercel
vercel.com

IP Address

76.76.21.123

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Walnut, United States

ASN

AS16509

Organization

Vercel, Inc

Server

Vercel

Nameservers

ns1.vercel-dns-2.com.ns2.vercel-dns-2.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
574 ms10%
Speed Index
746 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
254 KB
22 requests

Image Optimization

Lazy LoadResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

Hybrid
🔀 Hybrid
Frontend
Framework
Next.js
Infrastructure
Platform
Vercel
CDN
Vercel Image

Technology Stack

4 Technologies Detected

Meta Frameworks

1
Next.js

CSS Frameworks

1
Chakra UI

Analytics

1
Fathom Analytics

Platforms

1
Vercel

SEO Analysis

D53/100
14
12
0
Meta Tags9/15
Content9/12
Headings6/8
Technical9/21
E-E-A-T0/7
Images4/7
Links2/5
URL5/5
Social3/5
Freshness0/4
Mobile3/4
Indexability3/3
W
whocanuse.comwhocanuse.com

WhoCanUse

A tool that brings attention and understanding to how color contrast can affect people with different visual impairments.

Title Length9 chars

Recommended: 50-60 chars (~58px / 580px)

Description Length121 chars

Recommended: 120-160 chars

Issues (0)

    12 issues found

    Upgrade to view details

    Local SEO

    Local Search Readiness

    0/100
    Poor
    15 2

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

    Sponsored

    AI & LLM Readiness

    F38/100
    Bot Access
    20/25
    Machine Read.
    10/25
    Schema Data
    0/25
    Citation
    8/25

    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:4%
    Words:650
    Token eff.:Optimal
    Sections/1K:7.7

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary10w
    Descriptive Headingsavg 7.6w
    Canonical URL
    Open Graph3/3
    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
    63/100
    10
    Passed
    6
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    9/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    5/15
    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
    7/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    4 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.
    77/100
    A+
    26 mg
    CO₂e / view
    253.7 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    29 mg
    vs
    Returning (cached)
    15 mg
    Annual (10K/mo)
    3.1 kg
    Emission Segments
    Data Center
    1 mg
    Network
    8 mg
    Device
    17 mg
    Resource Breakdown
    JavaScript
    231.7 KB
    Images
    2.1 KB
    CSS
    3.6 KB
    HTML
    16.3 KB
    Green Hosting Verified
    Vercel
    Provider Match
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    36%Critical
    Interactive

    HTTPS

    No WAF

    51d

    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

    16.04.2026

    Valid Until

    15.07.2026

    Subject Alternative Names (1)

    *.whocanuse.com

    SHA-256 Fingerprint

    41:70:10:76:4C:2F:CB:42:4E:FD:E0:C5:11:5A:91:62:02:4C:72:C6...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    age
    66863
    cache-control
    🟡 0s(public, max-age=0, must-revalidate)
    content-disposition
    inline
    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html; charset=utf-8
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    whocanuse.com

    Domain Age
    7y 5m

    Created

    05.12.2018

    Expires

    05.12.2026

    Last Updated

    04.12.2025

    Registrar

    1API GmbH

    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.
    B
    74/100
    Mobile Friendly13 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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Inter UI

    WCAG Partial
    75/100
    Readability
    /30
    24/30

    16px · LH 1.45

    Hierarchy
    /20
    14/20

    1.88x ratio

    WCAG
    /25
    17/25

    4.02:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    Inter UI

    Sans30px

    Body Font

    Inter UI

    Sans16px

    Contrast Ratio

    4.02:1

    8 issues

    Reading Comfort

    ~43 CPL

    Narrow lines
    30px
    h1
    18px
    h2
    16px
    p

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

    ✅ Optimal line spacing: 1.45 ratio (ideal range 1.4–1.6).

    ⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 4.0:1).

    ⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ System fonts: Zero font loading delay — best possible LCP impact.

    Buy on MyFontsFlesch 60

    Color Palette

    6 unique colors
    Light
    #ffffff
    Background· 64.4%
    #663398
    Primary· 19.9%
    #33488d
    Secondary· 2.5%
    #77529a
    Secondary· 2.2%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    FathomSMB
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Ad Networks

    Carbon Ads

    Sponsored

    Scripts & Styles

    14 Resources

    12
    Scripts
    2
    Styles
    2
    Async
    10
    Defer

    Top Script Sources

    local(10)cdn.usefathom.com(1)cdn.carbonads.com(1)

    Website Identity

    whocanuse.com

    7 years old
    Location detected: 🇺🇸 United Statesvia ip
    1API GmbH

    Social Profiles

    X (Twitter)GitHub

    Sponsored

    Last analyzed: 24 May 2026 at 08:35

    Historical Analysis & Change Tracking