astralcodexten.com
Astral Codex Ten | Scott Alexander | Substack
Last scanned Aug 4, 2026, 10:00 AM · 14 views
Overall score
Great
Summary
P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. This website uses Express behind Cloudflare CDN. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores good (85/100) and performance fair (70/100). Top issue: robots.txt not found.
P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
Top issues to fix
6 issues found · 1 high priority
Slow estimated load (4.6s)
PerformanceUse a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
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.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
20 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
2 issue(s) found
Performance
4.60 s
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
-5 overall since Jul 27, 2026
- Overall
- 86
- SEO
- 90
- Security
- 85
- Performance
- 70
- Accessibility
- 100
Organization
Company details published in this site's own structured data.
P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
Meta tags
- Title
- Astral Codex Ten | Scott Alexander | Substack
- Description
- P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. Click to read Astral Codex Ten, by Scott Alexander, a Substack publication.
- Canonical
- https://www.astralcodexten.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
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
- www.astralcodexten.com
- Valid from
- Jul 14, 2026
- Valid to
- Oct 12, 2026
- Days until expiry
- 69
- SAN domains
- www.astralcodexten.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 3 cookie(s) observed
Content & assets
Headings
H1 1 · H2 0 · H3 0
Links
14 internal · 24 external · 20 broken
Images
15 total · 0 missing alt
Scripts / Styles
173 scripts · 20 stylesheets
JS / CSS size
232 KB · 1.8 KB
Page size
374 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://astralcodexten.com
- Final URL
- https://www.astralcodexten.com/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 4.59 s
- HTML size
- 374 KB
- Redirect chain
- https://astralcodexten.com → https://www.astralcodexten.com/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does astralcodexten.com use?
- astralcodexten.com is built with Express, Node.js, Cloudflare Analytics.
- Is astralcodexten.com secure (HTTPS)?
- Yes. astralcodexten.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 12, 2026.
- Who hosts astralcodexten.com?
- Hosting provider information for astralcodexten.com is not available yet.
- What is astralcodexten.com's SEO score?
- astralcodexten.com scored 90/100 for SEO in the latest analysis (excellent).
- What is astralcodexten.com's overall website score?
- astralcodexten.com has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
- Has astralcodexten.com's score changed over time?
- astralcodexten.com's overall score has declined by 5 points (from 91 to 86) since Jul 27, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card