blackcatsystems.com

https://blackcatsystems.com· First analyzed 16 May 2026· Updated 16 May 2026

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blackcatsystems.com

Mobile

Sponsored

Hosting Provider

pair Networks

IP Address

216.92.10.68

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Pittsburgh, United States

ASN

AS7859

Organization

pair Networks

Server

Apache

Nameservers

ns539.pair.com.ns0.ns0.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

314 ms10%

Speed Index

408 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

33 KB

5 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

pair Networks

Technology Stack

2 Technologies Detected

Analytics

Google Analytics

Web Servers

Apache

SEO Analysis

D50/100

Meta Tags14/15

Content11/12

Headings0/8

Technical9/25

E-E-A-T0/7

Images2/7

Links2/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

blackcatsystems.comblackcatsystems.com

Black Cat Systems - Ham Radio and Audio Software

Black Cat Systems - Windows and macOS software, specializing in ham / shortwave radio, audio, and science related programs

Title Length48 chars

Recommended: 50-60 chars (~299px / 580px)

Description Length122 chars

Recommended: 120-160 chars

Issues (1)

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

12 issues found

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Crawlability

Sitemap

Type: standard

545 URLs

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

7/100

Poor

2 13 2

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

Sponsored

AI & LLM Readiness

F30/100

Bot Access

20/25

Machine Read.

8/25

Schema Data

0/25

Citation

2/25

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

Text ratio:13%

Words:625

Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary13w

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...

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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.

53/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

3/20

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.

4 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

A+

3 mg

CO₂e / view

33.4 KB

Page Weight

95%

Cleaner Than

New Visitor

4 mg

Returning (cached)

2 mg

Annual (10K/mo)

408 g

Emission Segments

Data Center

<0.001 g

Network

1 mg

Device

2 mg

Resource Breakdown

Images

4.5 KB

HTML

28.9 KB

Green Hosting Verified

pair Networks

Provider Match

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

289d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

29.01.2026

Valid Until

01.03.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

blackcatsystems.comwww.blackcatsystems.com

SHA-256 Fingerprint

48:D9:93:C2:00:38:1B:4A:22:5E:9B:AC:18:96:D2:87:81:99:0E:4E...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

Keep-Alive

content-type

text/html

date

Sat, 16 May 2026 14:33:35 GMT

keep-alive

timeout=5, max=100

server

Apache

transfer-encoding

chunked

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mailwash58.pair.com

Domain Information

blackcatsystems.com

Domain Age

27y 6m

Created

17.11.1998

Expires

16.11.2029

Last Updated

23.03.2026

Registrar

pair Networks, Inc. d/b/a pair Domains

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.

53/100

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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Times New Roman

WCAG AAA

68/100

Readability

/30

20/30

16px · LH --

Hierarchy

/20

10/20

WCAG

/25

24/25

8.59:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

8.59:1

WCAG AAA (≥7:1)

Reading Comfort

~40 CPL

Narrow lines

16px

✅ Excellent readability: 16px body text is ideal for all devices.

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 8.6:1).

✅ 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 MyFontsFlesch 0

Color Palette

8 unique colors

4.4:1 AA Large Light

#ffffff

Background· 83.60000000000001%

#777787

Other· 2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

ssl.google-analytics.com(1)

Website Identity