551.com.tw

https://551.com.tw· First analyzed 06 May 2026· Updated 06 May 2026

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551.com.tw

Mobile

Sponsored

Hosting Provider

Linode (Akamai)

linode.com

IP Address

139.162.71.140

Site Location

🇹🇼 Taiwanvia tld

Server Location

🇯🇵 Tokyo, Japan

ASN

AS63949

Organization

Linode

Server

Nginx

Nameservers

dns.551.com.tw.jp.551.com.tw.dns.gmw.com.tw.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.9 s10%

Speed Index

2.5 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.6 MB

18 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Joomla!

Technology Stack

5 Technologies Detected

CSS Frameworks

Icon Libraries

Fonts

Customer Support

Web Servers

SEO Analysis

D59/100

Meta Tags4/15

Content7/12

Headings8/8

Technical16/25

E-E-A-T5/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

551.com.tw551.com.tw

首頁

No description available for this page.

Title Length2 chars

Recommended: 50-60 chars (~12px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Most images missing alt text (6/10) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

4 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

28/100

Needs Work

8 9

Sponsored

AI & LLM Readiness

D41/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

7/25

Citation

7/25

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:173

Token eff.:Too Short

Sections/1K:34.7

Depth:1/5

Structured Data

4 JSON-LD

Article×1.2(min)Organization×1.1WebSite

Citation Readiness

Opening Summary

Descriptive Headingsavg 1.2w

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.

76/100

Passed

Critical

Warnings

Images & Alt Text

10/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

20/20

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

7/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•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.

45/100

373 mg

CO₂e / view

3.6 MB

Page Weight

15%

Cleaner Than

New Visitor

427 mg

Returning (cached)

213 mg

Annual (10K/mo)

44.8 kg

Emission Segments

Data Center

18 mg

Network

110 mg

Device

245 mg

Resource Breakdown

JavaScript

335.3 KB

Images

2.5 MB

CSS

746.0 KB

Fonts

32.4 KB

HTML

8.4 KB

Green Hosting Verified

Linode (Akamai)

Provider Match

4 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

39%Critical

Interactive

HTTPS

No WAF

88d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

04.07.2025

Valid Until

02.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.551.com.tw551.com.tw

SHA-256 Fingerprint

32:40:4A:3F:6B:71:25:3B:C4:9E:0A:59:9D:23:34:C5:5E:0E:A5:B3...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

cross-origin-opener-policy

same-origin

date

Wed, 06 May 2026 06:59:25 GMT

expires

Wed, 17 Aug 2005 00:00:00 GMT

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

ALT1.ASPMX.L.GOOGLE.COM

ASPMX3.GOOGLEMAIL.COM

ASPMX5.GOOGLEMAIL.COM

ALT2.ASPMX.L.GOOGLE.COM

+3 more

Domain Information

551.com.tw

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.

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

1 recommendation

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Arial

WCAG Partial

76/100

Readability

/30

27/30

20px · LH 1.60

Hierarchy

/20

19/20

3.84x ratio · ✓ H1→H6

WCAG

/25

14/25

1:1 min contrast

Performance

/25

16/25

System fonts

Heading Font

Arial

Sans77px

Body Font

Arial

Sans20px

Contrast Ratio

1:1

2 issues

Reading Comfort

~38 CPL

Narrow lines

77px

32px

42px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

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

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 3.8x larger than body text.

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

GGoogle Fonts

Color Palette

7 unique colors

11.91:1 AAA Light

#fafafa

Background· 82.89999999999999%

#343435

Other· 3.2%

Business & Marketing Stack

2 Tools Detected

Growing

Customer Support

Tawk.toFree

Live chat and helpdesk tools

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(5)embed.tawk.to(1)

Website Identity

伍伍壹企業有限公司

Organization

customer@551.com.tw

04-2332-1899

551.com.tw/

Location detected: 🇹🇼 Taiwanvia tld

📧 Google Workspacezh-tw

Social Profiles

Facebook

Sponsored

Last analyzed: 06 May 2026 at 06:59

Historical Analysis & Change Tracking