alu.cn

https://alu.cn· First analyzed 05 May 2026· Updated 05 May 2026

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alu.cn

Mobile

Sponsored

Hosting Provider

Jilin province high technology Co., Ltd.

IP Address

183.131.19.72

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Jilin, China

ASN

AS58461

Organization

Jilin province high technology Co., Ltd.

CDN

Cloudflare

WAF

Cloudflare

Nameservers

harmony.ns.cloudflare.com.anirban.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.9 s10%

Speed Index

2.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

22 KB

95 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Jilin province high technology Co., Ltd.

CDN

Cloudflare

Technology Stack

2 Technologies Detected

Libraries

jQueryv1.8.0

CSS Frameworks

Tailwind CSS

SEO Analysis

D56/100

Meta Tags9/15

Content11/12

Headings8/8

Technical6/25

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social1/5

Freshness0/4

Mobile4/4

Indexability3/3

alu.cnalu.cn

铝道网_铝产业一站式平台，专注服务铝行业

铝道网是专业的B2B铝行业平台信息网站，致力于中国铝行业的中铝公司或者个人提供铝业行情资讯(如中铝价格)、铝业信息技术(如硫酸铝的应用)、铝业知识分类(如铝分为铝合金、铝型材等等)、铝的供应求购信息(如我要铝合金门窗)、铝业人才招聘等丰富信息内容；更多信息可登陆铝道网 www.alu.cn

Title Length20 chars

Recommended: 50-60 chars (~124px / 580px)

Description Length146 chars

Recommended: 120-160 chars

Issues (1)

• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

11 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

31 rules

Local SEO

Local Search Readiness

0/100

Poor

15 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F34/100

Bot Access

20/25

Machine Read.

9/25

Schema Data

0/25

Citation

5/25

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

def. lists

Text ratio:6%

Words:574

Token eff.:Optimal

Sections/1K:73.2

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary19w

Descriptive Headingsavg 1w

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...

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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.

58/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

8/20

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

1/15

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

4 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.

67/100

A+

2 mg

CO₂e / view

21.8 KB

Page Weight

95%

Cleaner Than

New Visitor

3 mg

Returning (cached)

1 mg

Annual (10K/mo)

264 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

1 mg

Resource Breakdown

Images

1.4 KB

HTML

18.4 KB

Other

2.0 KB

Green Hosting Verified

Cloudflare

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

257d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

16.12.2025

Valid Until

17.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.alu.cnalu.cn

SHA-256 Fingerprint

C6:BC:8C:C7:C5:FE:AD:57:3B:EB:2D:93:82:7D:FE:0C:FF:43:D3:94...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-length

18575

content-type

text/html; charset=gb2312

date

Tue, 05 May 2026 02:44:12 GMT

etag

"7070aff137dcdc1:0"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mx.mail.ym.163.com

Domain Information

alu.cn

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.

34/100

Not 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.

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

微软雅黑

WCAG Partial

45/100

Readability

/30

4/30

12px · LH 2.50

Hierarchy

/20

13/20

1x ratio · ✓ H1→H6

WCAG

/25

14/25

2.32:1 min contrast

Performance

/25

14/25

2 fonts

Heading Font

微软雅黑

Sans12px

Body Font

微软雅黑

Sans12px

Contrast Ratio

2.32:1

12 issues

Reading Comfort

~138 CPL

Too wide

12px

24px

13px

12px

Minor Third

Scale

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide line spacing (2.50). 1.4–1.6 is optimal for body text.

❌ Very long lines: ~138 chars/line causes eye strain. Add max-width constraint.

⚠️ Partial contrast: 12 elements below WCAG AA threshold (min 2.3:1).

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

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

Buy on MyFonts

Color Palette

8 unique colors

2.94:1 Fail Light

#ffffff

Background· 47.599999999999994%

#9b9596

Other· 5.5%

#e62320

Primary· 8%

#a30e0d

Accent· 5.5%

#e8885c

Accent· 4.4%

#f7e3ce

Accent· 3.6%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

meta.alu.cn(6)zz.bdstatic.com(1)hm.baidu.com(1)

Website Identity

alu.cn

Location detected: 🇨🇳 Chinavia tld

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 05 May 2026 at 02:44

Historical Analysis & Change Tracking