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sqlbolt.com

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

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Hosting Provider

DigitalOcean
digitalocean.com

IP Address

45.55.111.221

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS14061

Organization

Digital Ocean

Server

Nginx

Nameservers

ns3dty.name.com.ns4jpz.name.com.ns1mpz.name.com.ns2dqr.name.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
542 ms10%
Speed Index
705 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
740 KB
36 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
DigitalOcean

Technology Stack

13 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Facebook Pixel

Libraries

2
jQueryv1.11.3
Underscore.js

CSS Frameworks

2
Bootstrapv3.3.5
Tailwind CSS

Advertising

2
Google AdsGoogle AdSense

Other

1
Modernizr

Fonts

1
Google Fonts

Payments

1
PayPal

Web Servers

1
Nginx

SEO Analysis

D59/100
15
10
0
Meta Tags12/15
Content9/12
Headings6/8
Technical13/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
S
sqlbolt.comsqlbolt.com

SQLBolt - Learn SQL - Introduction to SQL

SQLBolt provides a set of interactive lessons and exercises to help you learn SQL

Title Length41 chars

Recommended: 50-60 chars (~256px / 580px)

Description Length81 chars

Recommended: 120-160 chars

Issues (0)

    10 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    54 rules

    Local SEO

    Local Search Readiness

    10/100
    Poor
    3 12 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:2%
    Words:677
    Token eff.:Optimal

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary21w
    Descriptive Headings
    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
    73/100
    11
    Passed
    5
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    12/20
    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
    7/15
    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...
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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.
    61/100
    A
    75 mg
    CO₂e / view
    739.7 KB
    Page Weight
    80%
    Cleaner Than
    New Visitor
    85 mg
    vs
    Returning (cached)
    43 mg
    Annual (10K/mo)
    9.0 kg
    Emission Segments
    Data Center
    4 mg
    Network
    22 mg
    Device
    49 mg
    Resource Breakdown
    JavaScript
    661.1 KB
    Images
    31.6 KB
    CSS
    18.9 KB
    Fonts
    5.0 KB
    HTML
    5.1 KB
    Other
    18.0 KB
    Green Hosting Verified
    DigitalOcean
    Provider Match
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    No WAF

    57d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/2

    Valid From

    21.04.2026

    Valid Until

    20.07.2026

    Subject Alternative Names (2)

    sqlbolt.comwww.sqlbolt.com

    SHA-256 Fingerprint

    B2:74:B8:1F:C9:2D:7F:64:45:BD:55:EE:5B:C4:A2:E1:09:0B:C1:11...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=UTF-8
    date
    Sun, 24 May 2026 03:25:48 GMT
    server
    nginx
    strict-transport-security
    max-age=31536000; includeSubDomains
    vary
    Accept-Encoding
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    sqlbolt.com

    Domain Age
    11y 6m

    Created

    18.11.2014

    Expires

    18.11.2031

    Last Updated

    14.07.2022

    Registrar

    Name.com, Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    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
    62/100
    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
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Segoe UI + Myriad Pro

    WCAG Partial
    65/100
    Readability
    /30
    24/30

    17px · LH 1.43

    Hierarchy
    /20
    10/20

    1.12x ratio

    WCAG
    /25
    18/25

    2.48:1 min contrast

    Performance
    /25
    13/25

    System fonts

    Heading Font

    Segoe UI

    Sans19px

    Body Font

    Myriad Pro

    Sans17px

    Contrast Ratio

    2.48:1

    1 issue

    Reading Comfort

    ~34 CPL

    Narrow lines
    19px
    h1
    17px
    p

    ✅ Excellent readability: 17px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

    ⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 2.5:1).

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

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

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

    GGoogle FontsFlesch 52

    Color Palette

    5 unique colors
    Light
    #9ea1a3
    Other· 5.1%
    #f6f5f1
    Primary· 73.59999999999998%
    #eae6e1
    Secondary· 14.000000000000002%

    Business & Marketing Stack

    5 Tools Detected

    Enterprise

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    2
    Google AdsEnterprise
    Facebook PixelMid-Market

    Ad platforms and retargeting pixels

    Social Media

    2
    Facebook SDKFree
    Twitter/X WidgetsFree

    Social widgets and sharing tools

    3

    Categories

    5

    Total Tools

    1

    Enterprise

    1

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Ad Networks

    Google AdSense

    Sponsored

    Scripts & Styles

    18 Resources

    13
    Scripts
    5
    Styles
    3
    Async
    0
    Defer

    Top Script Sources

    cdnjs.cloudflare.com(5)platform.twitter.com(2)connect.facebook.net(2)pagead2.googlesyndication.com(2)local(1)

    Website Identity

    sqlbolt.com

    sqlbolt@gmail.com
    11 years old
    Location detected: 🇺🇸 United Statesvia ip
    Name.com, Inc.en

    Social Profiles

    X (Twitter)

    Sponsored

    Last analyzed: 24 May 2026 at 03:26

    Historical Analysis & Change Tracking