ncatlab.org website report
nLab
Last scanned
Overall score
Great
About ncatlab.org
ncatlab.org is a website.
Score profile
Top issues to fix
8 issues found · 1 high priority
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
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.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
+2 more issues — details in the sections below.
How it compares
ncatlab.org scores higher overall than 75% of the 163,243 sites we have scanned.
vs. All scanned sites
163,243 sitesThe dot is this site; the tick is the typical (median) score for the group. The number on the right is the percentile: the share of the group this site scores above.
Technology stack
ncatlab.org is built with Nginx.
Servers (1)
Hosting & DNS
- IP address
- —
- ASN
- —
- IPv6
- Not supported
- HTTP
- HTTP/1.1
Show DNS record values
TXT record contents are not republished; only their count is shown.
Security
ncatlab.org uses TLS 1.3 with a certificate valid for 70 more days and sets 4 of 6 recommended security headers.
Security headers4 of 6 set
- HSTSForces HTTPS
- CSPBlocks injected scripts
- X-Frame-OptionsStops clickjacking
- X-Content-TypeStops MIME sniffing
- Referrer-PolicyLimits URL leakage
- Permissions-PolicyRestricts browser features
TLS certificate
- Names covered
- 1
- Cookies set
- 0
Email security
ncatlab.org scores B for email security, with SPF and DMARC policy “reject”.
- SPFGood
Rejects senders not listed (-all).
- DMARCGood
Forged mail is rejected; reports are collected.
- MTA-STSNot set
Not published; mail to this domain can be downgraded to plaintext.
- BIMINot set
Not published (optional).
Performance & carbon
ncatlab.org scores 100/100 for performance, with an estimated load time of 0.6 s. A visit emits an estimated 0.02 g of CO2 (grade A+).
Page weight
- HTML 51.4 KB
- JavaScript 1.6 KB
- CSS 3.7 KB
- Est. load
- 580 ms
- Response
- 579 ms
- Scripts / CSS
- 10 / 5
Carbon per visitA+
0.02 g CO2 per uncached view
Estimate from the Sustainable Web Design model. HTML, JavaScript and CSS only; images, video and fonts are not measured. Treat it as a lower bound for comparing pages, not an audit.
SEO & accessibility
ncatlab.org scores 55/100 for SEO and 100/100 for accessibility, with 7 SEO issues to fix.
Heading structure
2 H1s; one is the convention.
Image alt text
0 images · 0 without alt text · 0 lazy-loaded
Links
- Internal 259
- External 18
- Broken 10
SEO issues7
- Missing meta description
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues0
No accessibility issues detected.
Technical details
Page metadata, social tags, crawl files and scan information.
Meta tags
- Title
- nLab
- Description
- Canonical
- Language
- en
- Robots meta
- index,follow
Crawl files
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
Structured data
No JSON-LD types declared.
- Microdata items
- 0
- RDFa items
- 0
Scan
- Final URL
- https://ncatlab.org/nlab/show/HomePage
- HTTP status
- 200
- Redirects
- https://ncatlab.org → https://ncatlab.org/nlab/show/HomePage
- Scanned
- Aug 24, 2026, 1:23 PM
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Frequently asked questions about ncatlab.org
- What is ncatlab.org?
- ncatlab.org is a website.
- What technology does ncatlab.org use?
- ncatlab.org is built with Nginx.
- Is ncatlab.org secure?
- ncatlab.org uses TLS 1.3 with a certificate valid for 70 more days and sets 4 of 6 recommended security headers.
- Is ncatlab.org protected against email spoofing?
- ncatlab.org scores B for email security, with SPF and DMARC policy “reject”.
- How does ncatlab.org compare with similar sites?
- ncatlab.org scores higher overall than 75% of the 163,243 sites we have scanned.
- What is ncatlab.org's overall score?
- ncatlab.org has an overall SiteGraph score of 87/100, combining SEO (55), performance (100), security (100) and accessibility (100).
Open Graph & Twitter