lesswrong.com
LessWrong
Last scanned Jul 26, 2026, 5:17 AM · 1 view
Overall score
Fair
Summary
A community blog devoted to refining the art of rationality. This website uses WordPress hosted on AWS behind Vercel CDN. SEO is excellent (90/100) and accessibility is fair (60/100). Security scores good (75/100) and performance fair (65/100). Top issue: Multiple H1 headings found.
A community blog devoted to refining the art of rationality
- United States
- Hosted on AWS
Top issues to fix
9 issues found · 2 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
TLS certificate expires in 28 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
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.
2 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.
+3 more issues — details in the sections below.
SEO
2 issue(s) found
Performance
81 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
A community blog devoted to refining the art of rationality
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- LessWrong
- Description
- A community blog devoted to refining the art of rationality
- Canonical
- https://www.lesswrong.com/
- Language
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA |
|
| CNAME |
|
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.lesswrong.com
- Valid from
- May 26, 2026
- Valid to
- Aug 24, 2026
- Days until expiry
- 28
- SAN domains
- www.lesswrong.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 2 cookie(s) observed
Content & assets
Headings
H1 3 · H2 2 · H3 0
Links
96 internal · 26 external · 0 broken
Images
14 total · 10 missing alt
Scripts / Styles
129 scripts · 7 stylesheets
JS / CSS size
2.6 MB · 319 KB
Page size
899 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 14
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Multiple H1 headings found
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
- Missing <html lang> attribute
Careers
This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.
Scan details
- Requested URL
- https://lesswrong.com
- Final URL
- https://www.lesswrong.com/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 63 ms
- HTML size
- 899 KB
- Redirect chain
- https://lesswrong.com → https://www.lesswrong.com/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does lesswrong.com use?
- lesswrong.com is built with Next.js, WordPress, Google Analytics.
- Is lesswrong.com secure (HTTPS)?
- Yes. lesswrong.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 24, 2026.
- Who hosts lesswrong.com?
- lesswrong.com is hosted on AWS, behind Vercel CDN.
- What is lesswrong.com's SEO score?
- lesswrong.com scored 90/100 for SEO in the latest analysis (excellent).
- What is lesswrong.com's overall website score?
- lesswrong.com has an overall SiteGraph score of 74/100, combining SEO, performance, security, and accessibility.
- Is lesswrong.com hiring?
- lesswrong.com has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card