astralcodexten.com
Astral Codex Ten | Scott Alexander | Substack
Last scanned Jul 27, 2026, 10:43 AM · 1 view
Overall score
Excellent
Summary
P(A|B) = [P(A)*P(B|A)]/P(B), all the rest is commentary. This website uses Express hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (100/100) and accessibility is excellent (100/100). Security scores good (85/100) and performance good (80/100).
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.
- United States
- Hosted on Cloudflare
Top issues to fix
2 issues found
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.
SEO
0 issue(s) found
Performance
827 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
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
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.18.36.24
- 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
- www.astralcodexten.com
- Valid from
- Jul 14, 2026
- Valid to
- Oct 12, 2026
- Days until expiry
- 77
- 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 · 0 broken
Images
15 total · 0 missing alt
Scripts / Styles
171 scripts · 22 stylesheets
JS / CSS size
681 KB · 722 KB
Page size
372 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 15
- sitemap.xml
- Found
- URLs in sitemap
- 1440
SEO issues
No SEO issues detected.
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
- 820 ms
- HTML size
- 372 KB
- Redirect chain
- https://astralcodexten.com → https://www.astralcodexten.com/
See something wrong on this report? Request a correction
Related websites
Same technology stack
lettersofnote.com
Letters of Note | Shaun Usher | Substack
sq.com.ua
Status Quo | Новости Харькова. Последние новости Харькова. Главные новости Харькова
cozycozy.com
Search all Vacation Rentals, Airbnb, B&B & Hotels | cozycozy
emojicombos.com
Emoji Combos
foreca.cz
Počasí dnes - Foreca.cz
rumah123.com
Jual Beli Properti Rumah Apartemen | Rumah123
Same hosting provider
farelogix.com
Accelya | The AIRLINE-FIRST Software Platform
worldanimalprotection.org
World Animal Protection International | End Animal Cruelty
planradar.com
Construction and real estate management software - PlanRadar
pornworks.app
AI Porn Generator: Photos, Videos & GIFs | PornWorks AI
gopluslabs.io
GoPlus | The Leading Web3 and AI Agent Security Solutions
elogic.it
Dinova - Innovazione Digitale Per le Aziende
Frequently asked questions
- What technology does astralcodexten.com use?
- astralcodexten.com is built with Express, Node.js, Google Analytics, Cloudflare Analytics, Google Ads.
- 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?
- astralcodexten.com is hosted on Cloudflare, behind Cloudflare CDN.
- What is astralcodexten.com's SEO score?
- astralcodexten.com scored 100/100 for SEO in the latest analysis (excellent).
- What is astralcodexten.com's overall website score?
- astralcodexten.com has an overall SiteGraph score of 91/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card