dusays.com

https://dusays.com· First analyzed 28 Apr 2026· Updated 28 Apr 2026

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dusays.com

Mobile

Sponsored

Hosting Provider

Lefkoff Industries

IP Address

216.198.79.1

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Atlanta, United States

ASN

AS16509

Organization

Lefkoff Industries

Server

Vercel

Performance

100

Core Web Vitals

Weight

First Contentful Paint

593 ms10%

Speed Index

771 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

927 KB

33 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

JAMstack

⚡ SSG

Frontend

Framework

Hexov8.1.1

Infrastructure

Platform

Vercel

Technology Stack

5 Technologies Detected

UI Components

Libraries

CSS Frameworks

Platforms

SEO Analysis

C62/100

Meta Tags5/15

Content5/12

Headings3/8

Technical20/25

E-E-A-T5/7

Images1/7

Links5/5

URL5/5

Social4/5

Freshness2/4

Mobile4/4

Indexability3/3

dusays.comdusays.com

杜老师说

云计算运维讲师杜老师私人技术博客，主要分享一些运维技术、经验；本博客每三天更新，欢迎订阅。

Title Length4 chars

Recommended: 50-60 chars (~24px / 580px)

Description Length45 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (19/19) — critical for accessibility and SEO

9 issues found

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Crawlability

Sitemap

Type: standard

842 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

7/100

Poor

2 14 1

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

Sponsored

AI & LLM Readiness

D43/100

Bot Access

20/25

Machine Read.

4/25

Schema Data

4/25

Citation

15/25

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

navheader/footer

Text ratio:3%

Words:201

Token eff.:Too Short

Sections/1K:49.8

Depth:2/5

Structured Data

1 JSON-LD

Person×1.3

sameAs entity links

Citation Readiness

Opening Summary11w

Descriptive Headingsavg 2.3w

Canonical URL

Open Graph3/3

Twitter Card1/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (7)

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.

50/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

13/20

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

7/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

0/15

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

5 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.

64/100

115 mg

CO₂e / view

927.2 KB

Page Weight

80%

Cleaner Than

New Visitor

131 mg

Returning (cached)

66 mg

Annual (10K/mo)

13.8 kg

Emission Segments

Data Center

26 mg

Network

28 mg

Device

62 mg

Resource Breakdown

JavaScript

4.3 KB

CSS

54.2 KB

HTML

20.0 KB

Other

848.8 KB

Green Hosting Not Verified

Lefkoff Industries

2 recommendations

•Carbon footprint recommendation preview...

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Security Score

36%Critical

Interactive

HTTPS

No WAF

84d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

22.04.2026

Valid Until

21.07.2026

Subject Alternative Names (1)

dusays.com

SHA-256 Fingerprint

F1:3C:8A:50:63:D5:7D:14:A9:BA:27:C9:E6:E1:9C:70:2F:5C:C6:EF...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

age

281855

cache-control

🟡 0s(public, max-age=0, must-revalidate)

content-disposition

inline

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

dusays.com

Domain Age

6y 10m

Created

21.06.2019

Expires

20.02.2034

Last Updated

23.01.2026

Registrar

DNSPod, Inc.

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.

55/100

Mobile Friendly

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,maximum-scale=1

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Microsoft Yahei

WCAG Partial

58/100

Readability

/30

18/30

13px · LH 1.50

Hierarchy

/20

7/20

WCAG

/25

17/25

1.88:1 min contrast

Performance

/25

16/25

1 font

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans13px

Contrast Ratio

1.88:1

8 issues

Reading Comfort

~41 CPL

Narrow lines

21px

13px

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 1.9:1).

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

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

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

6 unique colors

4.25:1 AA Large Light

#ffffff

Background· 52.3%

#797d68

Secondary· 8.8%

#000000

Primary· 0%

#f6e8d9

Accent· 7.2%

#d6d1c8

Secondary· 7%

#f1d2a7

Accent· 6.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

jsd.admincdn.com(5)local(2)

Website Identity

杜老师说

Website

云计算运维讲师杜老师私人技术博客，主要分享一些运维技术、经验；本博客每三天更新，欢迎订阅。

6 years old

Location detected: 🇺🇸 United Statesvia ip

DNSPod, Inc.zh-CN

Social Profiles

GitHub

Sponsored

Last analyzed: 28 Apr 2026 at 03:35

Historical Analysis & Change Tracking