StackOptic
Back to Search
jshelter.org favicon

jshelter.org

https://jshelter.org· First analyzed 15 May 2026· Updated 15 May 2026
Export
jshelter.org
Desktop screenshot of jshelter.org
Mobile screenshot of jshelter.org
Mobile

Sponsored

Hosting Provider

Hurricane Electric LLC

IP Address

209.51.188.122

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Scarborough, United States

ASN

AS22989

Organization

Hurricane Electric LLC

Server

Apache

Nameservers

ns1.gnu.org.ns2.gnu.org.ns4.gnu.org.

Performance

95

Core Web Vitals

Weight

First Contentful Paint
1.2 s10%
Speed Index
1.5 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
827 KB
19 requests
0–49
50–89
90–100

Architecture Stack

JAMstack
⚡ SSG
Frontend
Framework
Pelican
Infrastructure
Hosting
Hurricane Electric LLC

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Web Servers

1
Apache

SEO Analysis

C64/100
18
6
1
Meta Tags9/15
Content12/12
Headings3/8
Technical16/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
J
jshelter.orgjshelter.org

JShelter: Home

An anti-malware Web browser extension to mitigate potential threats from JavaScript, including fingerprinting, tracking, and data collection!

Title Length14 chars

Recommended: 50-60 chars (~85px / 580px)

Description Length141 chars

Recommended: 120-160 chars

Issues (1)

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

7 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

51 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

D44/100
Bot Access
20/25
Machine Read.
13/25
Schema Data
0/25
Citation
11/25

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:28%
Words:669
Token eff.:Optimal
Sections/1K:4.5
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary17w
Descriptive Headingsavg 1w
Canonical URL
Open Graph3/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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.
B
75/100
11
Passed
3
Critical
1
Warnings
Images & Alt Text
20/20
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
12/15
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
6/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 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.
51/100
B
102 mg
CO₂e / view
827.4 KB
Page Weight
80%
Cleaner Than
New Visitor
117 mg
vs
Returning (cached)
59 mg
Annual (10K/mo)
12.3 kg
Emission Segments
Data Center
23 mg
Network
25 mg
Device
55 mg
Resource Breakdown
JavaScript
9.5 KB
Images
77.1 KB
CSS
736.1 KB
HTML
4.8 KB
Green Hosting Not Verified
Hurricane Electric LLC
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A+

Security Score

100%Excellent
Static / Informational

HTTPS

No WAF

51d

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

07.04.2026

Valid Until

06.07.2026

Subject Alternative Names (2)

jshelter.orgwww0p.jshelter.org

SHA-256 Fingerprint

3A:2D:0C:FB:94:0E:44:B7:9A:A5:B5:BF:06:9A:4A:CB:0D:DE:07:40...

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
connection
Keep-Alive
content-encoding
📦 Gzip(gzip)
content-length
4604
content-security-policy
default-src 'self'; script-src 'self' 'sha256-XcekRgC6IqZmWU...
content-type
text/html
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

65

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mail.fsf.org

Domain Information

jshelter.org

Domain Age
4y 9m

Created

09.08.2021

Expires

09.08.2026

Last Updated

29.07.2025

Registrar

Gandi SAS

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.
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...
Upgrade to view recommendations

Typography & Readability

Inter

WCAG AAA
58/100
Readability
/30
12/30

14px · LH 1.30

Hierarchy
/20
7/20
WCAG
/25
23/25

12.09:1 min contrast

Performance
/25
16/25

1 font · 5 req

Heading Font

Inter

Sans

Body Font

Inter

Sans14px

Contrast Ratio

12.09:1

WCAG AAA (≥7:1)

Reading Comfort

~40 CPL

Narrow lines
40px
h2
32px
h3
24px
h4
14px
p

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

⚠️ Tight line spacing (1.30). Increase to 1.4–1.6 for better readability.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 12.1:1).

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

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

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

Buy on MyFontsFlesch 54

Color Palette

6 unique colors
Light
#ffffff
Background· 48%
#e8dfc1
Primary· 25.3%
#e1d3a6
Secondary· 17%
#b0634c
Secondary· 4.8%
#c9b9a5
Secondary· 3.7%
#efecdb
Secondary· 1.3%

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

Sponsored

Scripts & Styles

6 Resources

3
Scripts
3
Styles
0
Async
0
Defer

Top Script Sources

local(3)

Website Identity

jshelter.org

4 years old
Location detected: 🇺🇸 United Statesvia ip
Gandi SASen

Sponsored

Last analyzed: 15 May 2026 at 14:26

Historical Analysis & Change Tracking