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chemsrc.com

https://chemsrc.com· First analyzed 15 May 2026· Updated 15 May 2026
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chemsrc.com
Desktop screenshot of chemsrc.com
Mobile screenshot of chemsrc.com
Mobile

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Hosting Provider

Alibaba Cloud
alibabacloud.com

IP Address

47.97.222.117

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Hangzhou, China

ASN

AS37963

Organization

Aliyun Computing Co., LTD

Server

Nginx

Nameservers

vip4.alidns.com.vip3.alidns.com.

Performance

89

Core Web Vitals

Weight

First Contentful Paint
1.5 s10%
Speed Index
2.0 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
137 KB
32 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Alibaba Cloud

Technology Stack

6 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Analytics

2
Google Analytics
Google Analytics 4

Libraries

1
jQueryv3.7.1

Web Servers

1
Nginx

SEO Analysis

C63/100
18
8
1
Meta Tags14/15
Content12/12
Headings1/8
Technical17/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
C
chemsrc.comchemsrc.com

名称,CAS号, CAS No,分子式,SMILES,InChIKey,EINECS查询 「化源网」 专业化工搜索引擎

化源网提供快速名称,CAS号, CAS No,分子式,SMILES,InChIKey,EINECS查询，数百万化合物的专业数据，包括物化, MSDS, 安全信息, 合成路线及文献, 毒性，上下游，期刊文献等。

Title Length59 chars

Recommended: 50-60 chars (~346px / 580px)

Description Length104 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing H1 tag — every page should have exactly one H1

9 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

183 rules

Local SEO

Local Search Readiness

15/100
Poor
5 11 2

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

Sponsored

AI & LLM Readiness

F37/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
3/25
Citation
6/25

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:3%
Words:856
Token eff.:Optimal
Depth:1/5

Structured Data

1 JSON-LD
WebSiteSearchAction

Citation Readiness

Opening Summary
Descriptive Headings
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...
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.
D
44/100
6
Passed
8
Critical
4
Warnings
Images & Alt Text
10/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
4/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
8/15
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
5/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
2/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
6 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.
56/100
A+
17 mg
CO₂e / view
136.6 KB
Page Weight
95%
Cleaner Than
New Visitor
19 mg
vs
Returning (cached)
10 mg
Annual (10K/mo)
2.0 kg
Emission Segments
Data Center
4 mg
Network
4 mg
Device
9 mg
Resource Breakdown
JavaScript
60.2 KB
CSS
47.7 KB
HTML
28.8 KB
Green Hosting Not Verified
Alibaba Cloud
5 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

171d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

03.11.2025

Valid Until

02.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.chemsrc.comchemsrc.com

SHA-256 Fingerprint

4D:1B:8C:7E:D4:02:AE:3B:08:D2:8C:FC:49:07:65:D9:B6:A8:EE:5A...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

connection
keep-alive
content-encoding
📦 Gzip(gzip)
content-type
text/html;charset=utf-8
date
Fri, 15 May 2026 15:22:51 GMT
server
nginx
transfer-encoding
chunked
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

45

SPF
DKIM
DMARC

MX Records (2)

mxbiz2.qq.com
mxbiz1.qq.com

Domain Information

chemsrc.com

Domain Age
10y 11m

Created

01.06.2015

Expires

01.06.2027

Last Updated

12.01.2026

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

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
56/100
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, maximum-scale=1.0, user-scalable=no
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Helvetica Neue

WCAG Partial
59/100
Readability
/30
18/30

15px · LH 1.43

Hierarchy
/20
8/20
WCAG
/25
14/25

2.79:1 min contrast

Performance
/25
19/25

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans15px

Contrast Ratio

2.79:1

3 issues

Reading Comfort

~43 CPL

Narrow lines
24px
h3
18px
h4
15px
p

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 9/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 3 elements below WCAG AA threshold (min 2.8:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 9

Color Palette

7 unique colors
Light
#fbfbfb
Background· 73.9%
#134f4b
Primary· 11.7%
#3d7570
Secondary· 4%
#7da7a7
Secondary· 3.8%
#efe9de
Secondary· 2.3%
#0b5f71
Accent· 1%

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

14 Resources

9
Scripts
5
Styles
1
Async
0
Defer

Top Script Sources

local(7)hm.baidu.com(1)googletagmanager.com(1)

Website Identity

chemsrc.com

service1@chemsrc.com
10 years old
Location detected: 🇨🇳 Chinavia ip
Alibaba Cloud Computing (Beijing) Co., Ltd.

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Last analyzed: 15 May 2026 at 15:23

Historical Analysis & Change Tracking