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dotinstall.com

https://dotinstall.com· First analyzed 12 May 2026· Updated 12 May 2026
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dotinstall.com
Desktop screenshot of dotinstall.com
Mobile screenshot of dotinstall.com
Mobile

Sponsored

Hosting Provider

SAKURA

IP Address

163.43.247.120

Site Location

🇯🇵 Japanvia ip

Server Location

🇯🇵 Osaka, Japan

ASN

AS9370

Organization

SAKURA

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

sofia.ns.cloudflare.com.hugh.ns.cloudflare.com.

Performance

73

Core Web Vitals

Weight

First Contentful Paint
6.6 s10%
Speed Index
8.6 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3 MB
47 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
SAKURA
CDN
Cloudflare

Technology Stack

8 Technologies Detected

Libraries

2
jQueryv1.10.2
Underscore.js

CSS Frameworks

2
Tailwind CSS
Bootstrap

Analytics

2
Google Analytics
Google Analytics 4

Icon Libraries

1
Font Awesome

Web Servers

1
Nginx

SEO Analysis

C66/100
19
9
0
Meta Tags11/15
Content8/12
Headings5/8
Technical16/25
E-E-A-T3/7
Images2/7
Links5/5
URL5/5
Social5/5
Freshness2/4
Mobile1/4
Indexability3/3
D
dotinstall.comdotinstall.com

ドットインストール - 3分動画でマスターできるプログラミング学習サービス

3分動画で初心者や独学の方でも無理なく勉強が続くプログラミング学習サービスです。Web制作の基礎から子供向けのゲーム制作レッスン、さらにシステム開発に使われるPHP、Ruby、Pythonなどの入門レッスンまで幅広く言語を体験できます。

Title Length37 chars

Recommended: 50-60 chars (~229px / 580px)

Description Length118 chars

Recommended: 120-160 chars

Issues (0)

    9 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    20 rules

    Local SEO

    Local Search Readiness

    6/100
    Poor
    2 13 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.
    5/25
    Schema Data
    0/25
    Citation
    15/25

    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
    header/footer
    Text ratio:6%
    Words:89
    Token eff.:Too Short
    Sections/1K:90
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary
    Descriptive Headingsavg 1.4w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    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.
    C
    69/100
    8
    Passed
    3
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    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
    10/15
    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
    0/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    3 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.
    14/100
    F
    382 mg
    CO₂e / view
    3.0 MB
    Page Weight
    30%
    Cleaner Than
    New Visitor
    436 mg
    vs
    Returning (cached)
    218 mg
    Annual (10K/mo)
    45.8 kg
    Emission Segments
    Data Center
    85 mg
    Network
    92 mg
    Device
    205 mg
    Resource Breakdown
    JavaScript
    646.3 KB
    Images
    475.3 KB
    CSS
    1.9 MB
    HTML
    6.0 KB
    Green Hosting Not Verified
    SAKURA
    7 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    31%Critical
    Interactive

    HTTPS

    No WAF

    74d

    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

    26.04.2026

    Valid Until

    25.07.2026

    Subject Alternative Names (1)

    dotinstall.com

    SHA-256 Fingerprint

    A1:AC:CD:94:86:DA:6E:CE:4B:88:CA:D6:05:8D:E3:5B:AC:63:49:00...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ch
    Sec-CH-UA-Arch, Sec-CH-UA-Platform, Sec-CH-UA-Platform-Versi...
    cache-control
    🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)
    content-encoding
    📦 Gzip(gzip)
    content-length
    5889
    content-type
    text/html; charset=UTF-8
    date
    Tue, 12 May 2026 04:05:46 GMT
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    65

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (5)

    alt4.aspmx.l.google.com
    alt2.aspmx.l.google.com
    aspmx.l.google.com
    alt1.aspmx.l.google.com

    +1 more

    Domain Information

    dotinstall.com

    Domain Age
    14y 8m

    Created

    31.08.2011

    Expires

    31.08.2026

    Last Updated

    01.08.2025

    Registrar

    GMO Internet Group, Inc. d/b/a Onamae.com

    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.
    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=1.0
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Arial

    WCAG Partial
    66/100
    Readability
    /30
    15/30

    13px · LH 1.60

    Hierarchy
    /20
    16/20

    2.75x ratio

    WCAG
    /25
    16/25

    2.1:1 min contrast

    Performance
    /25
    19/25

    System fonts

    Heading Font

    Arial

    Sans36px

    Body Font

    Arial

    Sans13px

    Contrast Ratio

    2.1:1

    13 issues

    Reading Comfort

    ~48 CPL

    Optimal (45–75)
    36px
    h1
    14px
    h3
    13px
    h4
    13px
    p

    ❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

    ✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

    ✅ Optimal line length: ~48 chars/line (ideal 45–75 CPL).

    ⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 2.1:1).

    ⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

    ✅ Strong hierarchy: Headlines are 2.8x larger than body text.

    Color Palette

    8 unique colors
    9.51:1 AAA Light
    #ffffff
    Background· 42.9%
    #474546
    Other· 3.6%
    #ffd181
    Primary· 44.3%
    #e1ebef
    Secondary· 3.7%
    #8d9070
    Secondary· 1.8%
    #d7dddf
    Secondary· 1.7%
    #f8e7c6
    Accent· 1.1%
    #dabf8c
    Accent· 1%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    Social Media

    1
    Facebook SDKFree

    Social widgets and sharing tools

    2

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    22 Resources

    12
    Scripts
    10
    Styles
    2
    Async
    0
    Defer

    Top Script Sources

    local(9)bs.nakanohito.jp(1)googletagmanager.com(1)cdnjs.cloudflare.com(1)

    Website Identity

    dotinstall.com

    14 years old
    Location detected: 🇯🇵 Japanvia ip
    GMO Internet Group, Inc. d/b/a Onamae.com📧 Google Workspaceja

    Social Profiles

    FacebookX (Twitter)

    Sponsored

    Last analyzed: 12 May 2026 at 04:06

    Historical Analysis & Change Tracking