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jasonxu.dev

https://jasonxu.dev· First analyzed 14 May 2026· Updated 14 May 2026
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jasonxu.dev
Desktop screenshot of jasonxu.dev
Mobile screenshot of jasonxu.dev
Mobile

Sponsored

Hosting Provider

Spectrum

IP Address

47.35.153.125

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Middleton, United States

ASN

AS20115

Organization

Spectrum

Server

Nginx

Nameservers

dns2.registrar-servers.com.dns1.registrar-servers.com.

Performance

90

Core Web Vitals

Weight

First Contentful Paint
1.5 s10%
Speed Index
1.9 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
79 KB
12 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Spectrum

Technology Stack

3 Technologies Detected

Meta Frameworks

1
SvelteKit

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginxv1.26.1

SEO Analysis

D50/100
15
7
0
Meta Tags5/15
Content6/12
Headings6/8
Technical11/21
E-E-A-T3/7
Images0/7
Links4/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
J
jasonxu.devjasonxu.dev

Jason Xu

About me

Title Length8 chars

Recommended: 50-60 chars (~49px / 580px)

Description Length8 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Local SEO

    Local Search Readiness

    3/100
    Poor
    1 14 2

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

    Sponsored

    AI & LLM Readiness

    D40/100
    Bot Access
    20/25
    Machine Read.
    8/25
    Schema Data
    0/25
    Citation
    12/25

    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
    code blocksheader/footer
    Text ratio:21%
    Words:221
    Token eff.:Too Short
    Sections/1K:31.7
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary68w
    Descriptive Headingsavg 3.3w
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (7)
    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
    81/100
    11
    Passed
    2
    Critical
    0
    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
    15/15
    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
    4/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •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
    A+
    10 mg
    CO₂e / view
    79.1 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    11 mg
    vs
    Returning (cached)
    6 mg
    Annual (10K/mo)
    1.2 kg
    Emission Segments
    Data Center
    2 mg
    Network
    2 mg
    Device
    5 mg
    Resource Breakdown
    JavaScript
    63.6 KB
    Images
    5.9 KB
    CSS
    2.5 KB
    HTML
    7.2 KB
    Green Hosting Not Verified
    Spectrum
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Static / Informational

    HTTPS

    No WAF

    97d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Sectigo Limited

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    19.07.2025

    Valid Until

    19.08.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    *.jasonxu.devjasonxu.dev

    SHA-256 Fingerprint

    80:5F:6A:0C:26:E6:16:E2:93:F8:1C:A8:61:6C:A4:17:42:A2:DE:F5...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    connection
    keep-alive
    content-length
    7043
    content-type
    text/html
    date
    Thu, 14 May 2026 07:31:07 GMT
    server
    nginx/1.26.1
    etag
    "2rl5y8"
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    70

    SPF
    DKIM
    DMARC

    MX Records (5)

    eforward5.registrar-servers.com
    eforward3.registrar-servers.com
    eforward4.registrar-servers.com
    eforward1.registrar-servers.com

    +1 more

    Domain Information

    jasonxu.dev

    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.
    D
    58/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Segoe UI

    WCAG Partial
    82/100
    Readability
    /30
    26/30

    21px · LH 1.50

    Hierarchy
    /20
    17/20

    2x ratio

    WCAG
    /25
    17/25

    1.13:1 min contrast

    Performance
    /25
    22/25

    System fonts

    Heading Font

    Segoe UI

    Sans42px

    Body Font

    Segoe UI

    Sans21px

    Contrast Ratio

    1.13:1

    13 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    42px
    h1
    37px
    h2
    21px
    h3
    21px
    h4
    21px
    p

    ✅ Excellent readability: 21px body text is ideal for all devices.

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

    ⚠️ Hard to read: Flesch score 41/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 1.1:1).

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

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

    Flesch 41

    Color Palette

    7 unique colors
    6.09:1 AA Dark
    #55585e
    Other· 0.1%
    #ecedef
    Secondary· 0.1%
    #1897c2
    Primary· 0%
    #131720
    Secondary· 99.39999999999998%
    #050911
    Accent· 0.2%
    #252931
    Secondary· 0.1%

    Sponsored

    Scripts & Styles

    2 Resources

    0
    Scripts
    2
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    Website Identity

    jasonxu.dev

    Location detected: 🇺🇸 United Statesvia ip
    en

    Social Profiles

    GitHub

    Sponsored

    Last analyzed: 14 May 2026 at 07:31

    Historical Analysis & Change Tracking