Content & assets
Headings
H1 0 · H2 0 · H3 1
Links
1 internal · 0 external · 0 broken
Images
0 total · 0 missing alt
Scripts / Styles
190 scripts · 19 stylesheets
JS / CSS size
511 KB · 932 KB
Page size
80.3 KB
substack.com
Substack
Last scanned Jul 14, 2026, 1:28 PM
86
Overall score
Great
Summary
This website uses Express hosted on Cloudflare behind Cloudflare CDN. SEO is good (80/100) and accessibility is excellent (90/100). Security scores good (85/100) and performance excellent (90/100). Top issue: No H1 heading found.
80
SEO
2 issue(s) found
90
Performance
242 ms
85
Security
HTTPS & header checks
90
Accessibility
1 issue(s) found
Meta tags
- Title
- Substack
- Description
- The app for independent voices
- Canonical
- https://substack.com/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0, viewport-fit=cover
- Robots meta
- Manifest
- https://substack.com/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.64.150.56
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- substack.com
- Valid from
- May 24, 2026
- Valid to
- Aug 22, 2026
- Days until expiry
- 38
- SAN domains
- substack.com, *.substack.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 9 cookie(s) observed
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 15
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- No H1 heading found
- No structured data (JSON-LD) found
Accessibility issues
- No H1 heading found
Careers
View careers page
Team
People listed on this site's own team or about page.
The Bulwark
By Caroline Chambers
What To Cook When You Don’t Feel Like Cooking
By Lenny Rachitsky
Lenny’s Newsletter
By Tina Brown
Fresh Hell
By Laura Reilly
Magasin
By Mehdi Hasan
Zeteo
By Kareem Abdul-Jabbar
Kareem Abdul-Jabbar
By Drop Site News
Drop Site News
By Yotam Ottolenghi
Ottolenghi
By Caleb Hearon
Caleb Hearon
By Nate Silver
Silver Bulletin
By George Saunders
Story Club
By Bari Weiss
The Free Press
By Citrini Research
Citrini Research
By Ina Garten
Barefoot Contessa
By Aaron Parnas
The Parnas Perspective
By Sam Harris
Making Sense
Scan details
- Requested URL
- https://substack.com
- Final URL
- https://substack.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 241 ms
- HTML size
- 80.3 KB
- Redirect chain
- https://substack.com
Frequently asked questions
- What technology does substack.com use?
- substack.com is built with Express, Node.js, Cloudflare Analytics.
- Is substack.com secure (HTTPS)?
- Yes. substack.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Aug 22, 2026.
- Who hosts substack.com?
- substack.com is hosted on Cloudflare, behind Cloudflare CDN.
- What is substack.com's SEO score?
- substack.com scored 80/100 for SEO in the latest analysis (great).
- What is substack.com's overall website score?
- substack.com has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
- Is substack.com hiring?
- Yes. substack.com has 33 open roles listed on their careers page.
OpenGraph & Twitter Card
OpenGraph
Twitter Card