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kirschsubstack.com

https://kirschsubstack.com· First analyzed 09 May 2026· Updated 09 May 2026
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kirschsubstack.com
Desktop screenshot of kirschsubstack.com
Mobile screenshot of kirschsubstack.com
Mobile

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Hosting Provider

Cloudflare
cloudflare.com

IP Address

104.18.36.24

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ashton.ns.cloudflare.com.tori.ns.cloudflare.com.

Performance

98

Core Web Vitals

Weight

First Contentful Paint
868 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
46 KB
148 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Substack

Technology Stack

5 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Fonts

1
Google Fonts

CDN

1
Cloudflare

Frameworks

1
Express

Analytics

1
Sentry

SEO Analysis

B74/100
24
6
1
Meta Tags10/15
Content6/12
Headings5/8
Technical20/25
E-E-A-T5/7
Images4/7
Links5/5
URL5/5
Social5/5
Freshness2/4
Mobile4/4
Indexability3/3
K
kirschsubstack.comkirschsubstack.com

Steve Kirsch's newsletter | Substack

I've written over 1,700 articles about COVID, vaccines, corruption, censorship, and early treatments. The data shows that the COVID vaccines have no benefit ...

Description truncated.
Title Length36 chars

Recommended: 50-60 chars (~217px / 580px)

Description Length361 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (8/10) — critical for accessibility and SEO

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,980 URLs

robots.txt

24 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.

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AI & LLM Readiness

D50/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
7/25
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
Text ratio:0%
Words:415
Token eff.:Optimal

Structured Data

1 JSON-LD
Organization×1.1WebSiteSearchAction
sameAs entity links

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph3/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (7)
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.
C
67/100
10
Passed
5
Critical
2
Warnings
Images & Alt Text
18/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
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
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
4/15
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.
81/100
A+
5 mg
CO₂e / view
45.6 KB
Page Weight
95%
Cleaner Than
New Visitor
5 mg
vs
Returning (cached)
3 mg
Annual (10K/mo)
552 g
Emission Segments
Data Center
<0.001 g
Network
1 mg
Device
3 mg
Resource Breakdown
HTML
45.6 KB
Green Hosting Verified
Cloudflare
GWF Verified
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
C

Security Score

61%Fair
Interactive

HTTPS

WAF

71d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

21.04.2026

Valid Until

20.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

kirschsubstack.com

SHA-256 Fingerprint

AE:0D:BA:AD:0F:64:17:8F:C1:A5:B4:D6:BE:C4:72:06:FD:20:A4:1A...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc
h3=":443"; ma=86400
cache-control
🔴 No Cache(no-cache)
cf-cache-status
MISS
cf-ray🇫🇷 Paris
9f9070e61be022aa-CDG
content-encoding
⚡ Brotli(br)
content-security-policy
frame-ancestors 'self' https://*.substack.com https://substa...
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

kirschsubstack.com

Domain Age
2y 10m

Created

06.07.2023

Expires

06.07.2029

Last Updated

10.06.2024

Registrar

Cloudflare, Inc.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
Privacy policy page linked
Data Protection Officer mentioned

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
67/100
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, maximum-scale=1, user-scalable=0, viewport-fit=cover
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

SF Pro Display + -apple-system

WCAG Partial
61/100
Readability
/30
20/30

19px · LH --

Hierarchy
/20
9/20

1.26x ratio

WCAG
/25
16/25

3.6:1 min contrast

Performance
/25
16/25

System fonts

Heading Font

SF Pro Display

Sans24px

Body Font

-apple-system

Sans19px

Contrast Ratio

3.6:1

15 issues

Reading Comfort

Dual Sans-Serif

left aligned
24px
h1
14px
h4

✅ Excellent readability: 19px body text is ideal for all devices.

⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 3.6:1).

❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

✅ System fonts: Zero font loading delay — best possible LCP impact.

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

Buy on MyFontsFlesch 53

Color Palette

10 unique colors
16.85:1 AAA Light
#ffffff
Primary· 74.39999999999998%
#1b1e19
Secondary· 2.2%
#e4e9e4
Border· 4.8%
#a18b7e
Secondary· 2.6%
#6f5345
Secondary· 1.4%

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

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Scripts & Styles

30 Resources

20
Scripts
10
Styles
0
Async
19
Defer

Top Script Sources

substackcdn.com(19)js.sentry-cdn.com(1)

Website Identity

Steve Kirsch's newsletter

I've written over 1,700 articles about COVID, vaccines, corruption, censorship, and early treatments. The data shows that the COVID vaccines have no benefit and have killed over 500,000 Americans. The data is publicly available, but nobody wants to look.

2 years old
Location detected: 🇨🇦 Canadavia ip
Cloudflare, Inc.en

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Last analyzed: 09 May 2026 at 11:42

Historical Analysis & Change Tracking