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4sonline.org

https://4sonline.org· First analyzed 24 May 2026· Updated 24 May 2026
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4sonline.org
Desktop screenshot of 4sonline.org
Mobile screenshot of 4sonline.org
Mobile

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Hosting Provider

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

92

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

SEO Analysis

D53/100
15
9
2
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
4
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

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.

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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...

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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.
C
65/100
8
Passed
4
Critical
0
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...

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
E
315 mg
CO₂e / view
2.5 MB
Page Weight
30%
Cleaner Than
New Visitor
360 mg
vs
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...
B

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

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

70

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
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.
C
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...

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
h1
40px
h2
28px
h3
16px
h4
14px
p

⚠️ 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.

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

1

User behavior and product analytics

Social Media

1

Social widgets and sharing tools

2

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

23 Resources

15
Scripts
8
Styles
1
Async
0
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

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Last analyzed: 24 May 2026 at 16:18

Historical Analysis & Change Tracking