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sei.co.jp

https://sei.co.jp· First analyzed 11 May 2026· Updated 11 May 2026
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sei.co.jp
Desktop screenshot of sei.co.jp
Mobile screenshot of sei.co.jp
Mobile

Sponsored

Hosting Provider

NTT Communications Corporation

IP Address

133.153.71.81

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Chiyoda City, Japan

ASN

AS4713

CDN

CDN

Nameservers

ns02.sei.co.jp.dnsrv.starnet.ad.jp.seigate.sei.co.jp.seigate-y.sei.co.jp.

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%
1.5 MB
82 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

8 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
FullStory

Libraries

1
jQuery

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Advertising

1
LinkedIn Ads

Payments

1
Square

SEO Analysis

B70/100
18
7
0
Meta Tags10/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social2/5
Freshness0/4
Mobile4/4
Indexability3/3
S
sei.co.jpsei.co.jp

住友電工 | Connect with Innovation

独創的な研究開発を通じ、環境エネルギー、情報通信、自動車、エレクトロニクス、産業素材の5つの分野で、幅広く事業を展開し、社会インフラの発展に貢献するグローバルカンパニー。

Title Length30 chars

Recommended: 50-60 chars (~180px / 580px)

Description Length85 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    1,707 URLs

    robots.txt

    41 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

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

    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
    nav
    Text ratio:3%
    Words:535
    Token eff.:Optimal
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary291w
    Descriptive Headingsavg 1.2w
    Canonical URL
    Open Graph1/3
    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.
    A
    87/100
    14
    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
    17/20
    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
    11/15
    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.
    40/100
    C
    190 mg
    CO₂e / view
    1.5 MB
    Page Weight
    60%
    Cleaner Than
    New Visitor
    218 mg
    vs
    Returning (cached)
    109 mg
    Annual (10K/mo)
    22.8 kg
    Emission Segments
    Data Center
    43 mg
    Network
    46 mg
    Device
    102 mg
    Resource Breakdown
    JavaScript
    97.7 KB
    Images
    1.0 MB
    CSS
    375.3 KB
    HTML
    24.7 KB
    Green Hosting Not Verified
    NTT Communications Corporation
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    WAF

    206d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    DigiCert Inc

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    03.11.2025

    Valid Until

    03.12.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    sumitomoelectric.comwww.sumitomoelectric.com

    SHA-256 Fingerprint

    E3:A5:A2:DE:5B:A2:C8:20:3A:23:59:B1:26:D1:99:9F:E4:EC:74:A3...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🟡 0s(max-age=0)
    content-encoding
    📦 Gzip(gzip)
    content-length
    24976
    content-type
    text/html; charset=UTF-8
    date
    Mon, 11 May 2026 01:29:42 GMT
    etag
    "1778204883"
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    90

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (2)

    sei-co-jp-2.fortimailcloud.com
    sei-co-jp-1.fortimailcloud.com

    Domain Information

    sei.co.jp

    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
    66/100
    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

    HCo Gotham SSm

    WCAG AAA
    73/100
    Readability
    /30
    20/30

    10px · LH 1.40

    Hierarchy
    /20
    17/20

    1.6x ratio · ✓ H1→H6

    WCAG
    /25
    23/25

    14.1:1 min contrast

    Performance
    /25
    13/25

    1 font · 4 req

    Heading Font

    HCo Gotham SSm

    Sans16px

    Body Font

    HCo Gotham SSm

    Sans10px

    Contrast Ratio

    14.1:1

    WCAG AAA (≥7:1)

    Reading Comfort

    ~51 CPL

    Optimal (45–75)
    16px
    h1
    48px
    h2
    24px
    h3
    10px
    p
    Major Sixth
    Scale

    ❌ Critical: 10px body text is too small. Minimum 14px, recommend 16px+.

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

    ✅ Optimal line length: ~50 chars/line (ideal 45–75 CPL).

    ✅ WCAG AAA contrast: All text meets 7:1 ratio (min 14.1:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Lean font stack: 1 font families keeps load times fast.

    Buy on MyFonts

    Color Palette

    12 unique colors
    Light
    #ffffff
    Background· 27.099999999999998%
    #1248a0
    Primary· 14.6%
    #0370bb
    Accent· 7.5%
    #4c85b2
    Secondary· 6.7%
    #262373
    Accent· 4.9%
    #6da9c3
    Secondary· 4.9%
    #eaedef
    Secondary· 4.9%
    #4f6881
    Secondary· 4.8%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    1
    LinkedIn AdsEnterprise

    Ad platforms and retargeting pixels

    2

    Categories

    3

    Total Tools

    1

    Enterprise

    0

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    22 Resources

    20
    Scripts
    2
    Styles
    8
    Async
    1
    Defer

    Top Script Sources

    googletagmanager.com(6)local(6)info-ss1.sumitomoelectric.com(2)cs.nakanohito.jp(1)snap.licdn.com(1)

    Website Identity

    sei.co.jp

    Location detected: 🇯🇵 Japanvia tld
    ja

    Sponsored

    Last analyzed: 11 May 2026 at 01:30

    Historical Analysis & Change Tracking