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alvinalexander.com

https://alvinalexander.com· First analyzed 06 May 2026· Updated 06 May 2026
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alvinalexander.com
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Mobile

Sponsored

Hosting Provider

Linode (Akamai)
linode.com

IP Address

45.79.219.226

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Atlanta, United States

ASN

AS63949

Organization

Linode

Server

Nginx

Nameservers

ns27.domaincontrol.com.ns28.domaincontrol.com.

Performance

95

Core Web Vitals

Weight

First Contentful Paint
1.2 s10%
Speed Index
1.5 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
2.8 MB
63 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

10 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
FullStory

Advertising

2
Google AdsGoogle AdSense

Libraries

1
jQueryv3.3.1

UI Components

1
Lightbox

Other

1
Modernizr

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

SEO Analysis

C61/100
16
11
0
Meta Tags10/15
Content12/12
Headings7/8
Technical16/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
A
alvinalexander.comalvinalexander.com

Scala, Java, Unix, MacOS tutorials (page 1) | alvinalexander.com

Free Scala, Java, Unix, MacOS tutorials (page 1)

Title Length64 chars

Recommended: 50-60 chars (~376px / 580px)

Description Length48 chars

Recommended: 120-160 chars

Issues (0)

    11 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    13 URLs

    13 sub-sitemaps

    robots.txt

    41 rules

    Local SEO

    Local Search Readiness

    7/100
    Poor
    2 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

    D42/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    0/25
    Citation
    9/25

    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
    blockquotescode blocksdef. listsnav
    Text ratio:25%
    Words:2,153
    Token eff.:Optimal
    Sections/1K:0.5
    Depth:4/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary13w
    Descriptive Headingsavg 4w
    Canonical URL
    Open Graph0/3
    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.
    B
    75/100
    10
    Passed
    4
    Critical
    0
    Warnings
    Images & Alt Text
    15/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    15/20
    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
    6/15
    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.
    36/100
    E
    285 mg
    CO₂e / view
    2.8 MB
    Page Weight
    30%
    Cleaner Than
    New Visitor
    325 mg
    vs
    Returning (cached)
    163 mg
    Annual (10K/mo)
    34.2 kg
    Emission Segments
    Data Center
    14 mg
    Network
    84 mg
    Device
    187 mg
    Resource Breakdown
    JavaScript
    467.8 KB
    Images
    2.1 MB
    CSS
    153.6 KB
    HTML
    13.5 KB
    Other
    18.8 KB
    Green Hosting Verified
    Linode (Akamai)
    Provider Match
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Static / Informational

    HTTPS

    No WAF

    83d

    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/1.1

    Valid From

    29.04.2026

    Valid Until

    28.07.2026

    Subject Alternative Names (1)

    alvinalexander.com

    SHA-256 Fingerprint

    44:E5:D8:46:C9:C8:86:DD:BD:28:24:E3:AF:7D:9B:4A:6C:BE:F7:0D...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔴 No Cache(no-store, no-cache, must-revalidate, proxy-revalidate, max-a...)
    connection
    keep-alive
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html
    date
    Wed, 06 May 2026 18:59:04 GMT
    server
    nginx
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (5)

    aspmx2.googlemail.com
    alt1.aspmx.l.google.com
    aspmx3.googlemail.com
    alt2.aspmx.l.google.com

    +1 more

    Domain Information

    alvinalexander.com

    Domain Age
    18y 6m

    Created

    19.10.2007

    Expires

    19.10.2026

    Last Updated

    20.10.2025

    Registrar

    GoDaddy.com, LLC

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    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
    60/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Lucida Grande + Helvetica Neue

    WCAG Partial
    76/100
    Readability
    /30
    25/30

    19px · LH 1.40

    Hierarchy
    /20
    12/20

    1.37x ratio

    WCAG
    /25
    19/25

    4.01:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    Lucida Grande

    Sans26px

    Body Font

    Helvetica Neue

    Sans19px

    Contrast Ratio

    4.01:1

    Below AA

    Reading Comfort

    ~34 CPL

    Narrow lines
    26px
    h1
    24px
    h2
    16px
    h4
    19px
    p

    ✅ Excellent readability: 19px body text is ideal for all devices.

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

    ⚠️ Partial contrast: 0 elements below WCAG AA threshold (min 4.0:1).

    ⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

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

    Buy on MyFontsFlesch 58

    Color Palette

    6 unique colors
    Light
    #ffffff
    Background· 75.89999999999999%
    #008ec6
    Primary· 10.9%
    #281164
    Accent· 5.9%
    #99b4c7
    Secondary· 3.6%
    #267bac
    Accent· 0.5%

    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

    21 Resources

    12
    Scripts
    9
    Styles
    5
    Async
    0
    Defer

    Top Script Sources

    local(6)fundingchoicesmessages.google.com(3)pagead2.googlesyndication.com(2)googletagmanager.com(1)

    Website Identity

    alvinalexander.com

    18 years old
    Location detected: 🇺🇸 United Statesvia ip
    GoDaddy.com, LLC📧 Google Workspaceen

    Social Profiles

    X (Twitter)

    Sponsored

    Last analyzed: 06 May 2026 at 18:59

    Historical Analysis & Change Tracking