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bookln.cn

https://bookln.cn· First analyzed 28 May 2026· Updated 28 May 2026
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bookln.cn
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Mobile screenshot of bookln.cn
Mobile

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Hosting Provider

Alibaba Cloud
alibabacloud.com

IP Address

47.105.42.250

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Qingdao, China

ASN

AS37963

Organization

Aliyun Computing Co., LTD

Performance

75

Core Web Vitals

Weight

First Contentful Paint
3.5 s10%
Speed Index
4.5 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
10.3 MB
58 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Hybrid
🔀 Hybrid
Frontend
Framework
Next.js
Styling
Tailwind CSS
Infrastructure
Hosting
Alibaba Cloud

Technology Stack

3 Technologies Detected

CSS Frameworks

2
Tailwind CSS
Ant Design

Meta Frameworks

1
Next.js

SEO Analysis

D41/100
11
13
1
Meta Tags7/15
Content3/12
Headings3/8
Technical11/21
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
B
bookln.cnbookln.cn

书链-教育图书读者服务平台

书链，书联网服务首选品牌，专注于图书行业的互联网+创新，旨在为图书出版社及发行商免费提供最安全，最稳定，功能最强大的图书数字化服务及图书营销整体解决方案。

Title Length13 chars

Recommended: 50-60 chars (~80px / 580px)

Description Length77 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (37/37) — critical for accessibility and SEO

14 issues found

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Local SEO

Local Search Readiness

3/100
Poor
1 14 2

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

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AI & LLM Readiness

F25/100
Bot Access
20/25
Machine Read.
1/25
Schema Data
0/25
Citation
4/25

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:1%
Words:152
Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headingsavg 1w
Canonical URL
Open Graph0/3
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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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
74/100
11
Passed
4
Critical
1
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
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
11/15
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.
3 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.
18/100
F
1.30 g
CO₂e / view
10.3 MB
Page Weight
5%
Cleaner Than
New Visitor
1.49 g
vs
Returning (cached)
745 mg
Annual (10K/mo)
156.4 kg
Emission Segments
Data Center
291 mg
Network
313 mg
Device
700 mg
Resource Breakdown
JavaScript
354.5 KB
Images
3.9 MB
CSS
7.7 KB
HTML
13.6 KB
Other
6.0 MB
Green Hosting Not Verified
Alibaba Cloud
8 recommendations
  • •Carbon footprint recommendation preview...
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B

Security Score

76%Good
Static / Informational

HTTPS

No WAF

195d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Beijing Xinchacha Credit Management Co., Ltd.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

25.05.2026

Valid Until

10.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.bookln.cnbookln.cn

SHA-256 Fingerprint

9D:41:8A:F2:FC:D2:4D:A7:99:96:DB:98:E4:3E:6A:52:D5:23:65:00...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-credentials
true
access-control-allow-headers
X-Requested-With,Content-Type,Accept,Origin,If-Modified-Sinc...
access-control-allow-methods
GET,POST,OPTIONS
access-control-max-age
3600
content-encoding
📦 Gzip(gzip)
content-language
en-GB
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

bookln.cn

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.
D
53/100
Not Mobile Friendly6 breakpoints
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.
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

-apple-system + Inter

WCAG Partial
68/100
Readability
/30
20/30

38px · LH 1.21

Hierarchy
/20
12/20

1x ratio

WCAG
/25
16/25

1:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

-apple-system

Sans38px

Body Font

Inter

Sans38px

Contrast Ratio

1:1

8 issues

Reading Comfort

Dual Sans-Serif

left aligned
38px
h1
24px
h3
20px
h4
38px
p

✅ Excellent readability: 38px body text is ideal for all devices.

⚠️ Tight line spacing (1.21). Increase to 1.4–1.6 for better readability.

⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 1 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.

Color Palette

9 unique colors
Light
#dadfdb
Other· 3.9%
#d4ebfd
Background· 45.6%
#effaff
Primary· 14.3%
#9fd1f2
Accent· 7.8%
#5aa4db
Accent· 7.4%
#bedbf6
Accent· 7%
#69b8e6
Accent· 6.5%
#a0c2df
Secondary· 3.8%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

13 Resources

11
Scripts
2
Styles
0
Async
10
Defer

Top Script Sources

local(10)yuntisyscdn.bookln.cn(1)

Website Identity

bookln.cn

Location detected: 🇨🇳 Chinavia tld
en

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Last analyzed: 28 May 2026 at 18:11

Historical Analysis & Change Tracking