4sonline.org

https://4sonline.org· First analyzed 24 May 2026· Updated 24 May 2026

Export

4sonline.org

Mobile

Sponsored

Hosting Provider

SourceDNS

IP Address

67.227.154.203

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Lansing, United States

ASN

AS32244

Organization

SourceDNS

Server

Apache

Nameservers

ns15.viethwebhosting.com.ns16.viethwebhosting.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.3 s10%

Speed Index

1.7 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.5 MB

42 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

SourceDNS

Technology Stack

8 Technologies Detected

Libraries

CSS Frameworks

Analytics

Fonts

Web Servers

SEO Analysis

D53/100

Meta Tags4/15

Content12/12

Headings6/8

Technical13/25

E-E-A-T3/7

Images1/7

Links2/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

4sonline.org4sonline.org

Home

No description available for this page.

Title Length4 chars

Recommended: 50-60 chars (~27px / 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 (13/14) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

9 rules

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.

Sponsored

AI & LLM Readiness

D43/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

0/25

Citation

9/25

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

header/footer

Text ratio:25%

Words:1,954

Token eff.:Optimal

Sections/1K:14.8

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary66w

Descriptive Headingsavg 9.6w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

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.

65/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

15/20

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

1/15

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

2 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.

21/100

315 mg

CO₂e / view

2.5 MB

Page Weight

30%

Cleaner Than

New Visitor

360 mg

Returning (cached)

180 mg

Annual (10K/mo)

37.8 kg

Emission Segments

Data Center

70 mg

Network

76 mg

Device

169 mg

Resource Breakdown

JavaScript

135.6 KB

Images

2.0 MB

CSS

378.8 KB

Fonts

2.5 KB

HTML

13.4 KB

Green Hosting Not Verified

SourceDNS

7 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

71%Good

Static / Informational

HTTPS

No WAF

74d

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/1.1

Valid From

09.05.2026

Valid Until

07.08.2026

Subject Alternative Names (2)

*.4sonline.org4sonline.org

SHA-256 Fingerprint

78:7D:5B:FC:71:D5:4C:F6:7A:F1:D9:1A:C6:7E:CA:57:46:AF:56:1A...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

13375

content-type

text/html; charset=UTF-8

date

Sun, 24 May 2026 16:18:19 GMT

keep-alive

timeout=5, max=200

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

4sonline.org

Domain Information

4sonline.org

Domain Age

22y 2m

Created

23.03.2004

Expires

23.03.2027

Last Updated

05.05.2026

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

63/100

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

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Noto Serif + Krub

WCAG Partial

65/100

Readability

/30

15/30

14px · LH 1.25

Hierarchy

/20

14/20

4.29x ratio

WCAG

/25

18/25

1:1 min contrast

Performance

/25

18/25

2 fonts · 1 req

Heading Font

Noto Serif

Serif60px

Body Font

Krub

Sans14px

Contrast Ratio

1:1

2 issues

Reading Comfort

~40 CPL

Narrow lines

60px

40px

28px

16px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Tight line spacing (1.25). Increase to 1.4–1.6 for better readability.

❌ Very complex text: Flesch score 21/100. Consider shorter sentences and simpler words.

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

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 4.3x larger than body text.

GGoogle Fonts Buy on MyFontsFlesch 21

Color Palette

11 unique colors

4.01:1 AA Large Light

#f6f5f5

Background· 21.000000000000004%

#7b7784

Other· 3.9%

#3a3f49

Text· 22.8%

#435263

Secondary· 14.1%

#1c6c9c

Primary· 10.5%

#546c79

Secondary· 8.6%

#29313d

Secondary· 5.5%

#111b2a

Secondary· 5.3%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

4sonline.org(14)googletagmanager.com(1)

Website Identity

4sonline.org

22 years old

Location detected: 🇺🇸 United Statesvia ip

Amazon Registrar, Inc.en

Social Profiles

Facebook X (Twitter)YouTube

Sponsored

Last analyzed: 24 May 2026 at 16:18

Historical Analysis & Change Tracking