lmsys.org
LMSYS Org
Last scanned Jul 26, 2026, 4:17 PM · 1 view
Overall score
Great
Summary
Large Model Systems Organization - developing large models and systems that are open, accessible, and scalable. This website uses Next.js behind Vercel CDN. SEO is good (80/100) and accessibility is excellent (90/100). Security scores good (75/100) and performance excellent (100/100). Top issue: No H1 heading found.
LMSYS Org
Large Model Systems Organization - developing large models and systems that are open, accessible, and scalable.
Top issues to fix
7 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.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
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.
+1 more issue — details in the sections below.
SEO
3 issue(s) found
Performance
19 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
LMSYS Org
Large Model Systems Organization - developing large models and systems that are open, accessible, and scalable.
Contact
Email, phone, and address published on this site's own pages.
- contact@lmsys.org
Meta tags
- Title
- LMSYS Org
- Description
- Large Model Systems Organization - developing large models and systems that are open, accessible, and scalable.
- Canonical
- https://www.lmsys.org/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- index, follow
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Vercel
- 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
- Let's Encrypt
- Subject
- www.lmsys.org
- Valid from
- Jun 5, 2026
- Valid to
- Sep 3, 2026
- Days until expiry
- 36
- SAN domains
- www.lmsys.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 3 · H3 3
Links
9 internal · 26 external · 20 broken
Images
14 total · 0 missing alt
Scripts / Styles
32 scripts · 1 stylesheets
JS / CSS size
117 KB · 0 B
Page size
139 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No H1 heading found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://lmsys.org
- Final URL
- https://www.lmsys.org/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 17 ms
- HTML size
- 139 KB
- Redirect chain
- https://lmsys.org → https://www.lmsys.org/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does lmsys.org use?
- lmsys.org is built with Next.js.
- Is lmsys.org secure (HTTPS)?
- Yes. lmsys.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 3, 2026.
- Who hosts lmsys.org?
- Hosting provider information for lmsys.org is not available yet.
- What is lmsys.org's SEO score?
- lmsys.org scored 80/100 for SEO in the latest analysis (great).
- What is lmsys.org's overall website score?
- lmsys.org has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
- What company operates lmsys.org?
- lmsys.org is operated by LMSYS Org. Large Model Systems Organization - developing large models and systems that are open, accessible, and scalable.
OpenGraph & Twitter Card
OpenGraph
Twitter Card