substack.com
Substack
Last scanned Jul 29, 2026, 11:00 AM · 13 views
Overall score
Great
Summary
The app for independent voices. This website uses Express behind Cloudflare CDN. SEO is fair (70/100) and accessibility is excellent (90/100). Security scores good (85/100) and performance excellent (90/100). Top issue: No H1 heading found.
The app for independent voices
Top issues to fix
8 issues found · 1 high priority
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
6 cookies without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
+2 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
627 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Score history
-3 overall since Jul 15, 2026
- Overall
- 83
- SEO
- 70
- Security
- 85
- Performance
- 90
- Accessibility
- 90
Organization
Company details published in this site's own structured data.
The app for independent voices
Contact
Email, phone, and address published on this site's own pages.
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
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- substack.com
- Valid from
- Jul 22, 2026
- Valid to
- Oct 20, 2026
- Days until expiry
- 82
- 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
Content & assets
Headings
H1 0 · H2 0 · H3 1
Links
19 internal · 4 external · 20 broken
Images
10 total · 0 missing alt
Scripts / Styles
138 scripts · 13 stylesheets
JS / CSS size
678 KB · 7.4 KB
Page size
824 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No H1 heading found
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://substack.com
- Final URL
- https://substack.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 611 ms
- HTML size
- 824 KB
- Redirect chain
- https://substack.com
See something wrong on this report? Request a correction
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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 Oct 20, 2026.
- Who hosts substack.com?
- Hosting provider information for substack.com is not available yet.
- What is substack.com's SEO score?
- substack.com scored 70/100 for SEO in the latest analysis (fair).
- What is substack.com's overall website score?
- substack.com has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
- Has substack.com's score changed over time?
- substack.com's overall score has declined by 3 points (from 86 to 83) since Jul 15, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card