lczero.org
Leela Chess Zero
Last scanned Aug 24, 2026, 1:22 PM · 1 view
Overall score
Great
Summary
Open source neural network based chess engine. This website uses Google Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.
Open source neural network based chess engine
- United States
- Hosted on Cloudflare
Top issues to fix
6 issues found · 2 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 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.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
SEO
2 issue(s) found
Performance
129 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Open source neural network based chess engine
Meta tags
- Title
- Leela Chess Zero
- Description
- Open source neural network based chess engine
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.21.10.163
- 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
- lczero.org
- Valid from
- Jul 7, 2026
- Valid to
- Oct 5, 2026
- Days until expiry
- 41
- SAN domains
- lczero.org, *.lczero.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 2 · H3 6
Links
10 internal · 6 external · 0 broken
Images
2 total · 0 missing alt
Scripts / Styles
4 scripts · 2 stylesheets
JS / CSS size
33.9 KB · 36.5 KB
Page size
8.5 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://lczero.org
- Final URL
- https://lczero.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 129 ms
- HTML size
- 8.5 KB
- Redirect chain
- https://lczero.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does lczero.org use?
- lczero.org is built with Google Analytics, Cloudflare Analytics.
- Is lczero.org secure (HTTPS)?
- Yes. lczero.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 5, 2026.
- Who hosts lczero.org?
- lczero.org is hosted on Cloudflare, behind Cloudflare CDN.
- What is lczero.org's SEO score?
- lczero.org scored 85/100 for SEO in the latest analysis (great).
- What is lczero.org's overall website score?
- lczero.org has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card