simonwillison.net
Simon Willison’s Weblog
Last scanned Jul 25, 2026, 8:25 PM · 2 views
Overall score
Great
Summary
This website uses Plausible Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores fair (70/100) and performance excellent (100/100). Top issue: Missing meta description.
- United States
- Hosted on Cloudflare
Products & pricing
Product and pricing information published in this site's own structured data.
Sponsored banner color scheme:
$10 USD
Top issues to fix
6 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
SEO
3 issue(s) found
Performance
70 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Simon Willison’s Weblog
- Description
- Canonical
- https://simonwillison.net/
- Language
- en-gb
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.67.136.172
- 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
- simonwillison.net
- Valid from
- Jun 25, 2026
- Valid to
- Sep 23, 2026
- Days until expiry
- 59
- SAN domains
- simonwillison.net, screenshots.simonwillison.net
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 2 · H3 15
Links
182 internal · 112 external · 0 broken
Images
20 total · 0 missing alt
Scripts / Styles
9 scripts · 1 stylesheets
JS / CSS size
41.0 KB · 138 B
Page size
92.4 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 2
- sitemap.xml
- Found
- URLs in sitemap
- 16796
SEO issues
- Missing meta description
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
No accessibility issues detected.
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://simonwillison.net
- Final URL
- https://simonwillison.net
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 69 ms
- HTML size
- 92.4 KB
- Redirect chain
- https://simonwillison.net
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does simonwillison.net use?
- simonwillison.net is built with Plausible Analytics, Cloudflare Analytics.
- Is simonwillison.net secure (HTTPS)?
- Yes. simonwillison.net uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 23, 2026.
- Who hosts simonwillison.net?
- simonwillison.net is hosted on Cloudflare, behind Cloudflare CDN.
- What is simonwillison.net's SEO score?
- simonwillison.net scored 75/100 for SEO in the latest analysis (fair).
- What is simonwillison.net's overall website score?
- simonwillison.net has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
- What products does simonwillison.net offer?
- simonwillison.net offers Sponsored banner color scheme:.
- Is simonwillison.net hiring?
- simonwillison.net has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card