observablehq.com
Observable Notebooks: Fast data exploration and prototyping
Last scanned Jul 26, 2026, 5:18 AM
Overall score
Excellent
Summary
Quickly explore and analyze data, build prototype data visualizations, and collaborate with your team in real-time with live JavaScript notebooks. This website uses Next.js hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (95/100) and accessibility is good (75/100). Security scores good (85/100) and performance excellent (100/100). Top issue: sitemap.xml not found.
Quickly explore and analyze data, build prototype data visualizations, and collaborate with your team in real-time with live JavaScript notebooks.
- United States
- Hosted on Cloudflare
Top issues to fix
6 issues found
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.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
More than 20% of images are missing alt text
AccessibilityAdd alt attributes to the remaining images (use alt="" for purely decorative ones).
Missing html lang attribute
AccessibilitySet <html lang="…"> so screen readers pick the right pronunciation rules.
1 broken link on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
1 issue(s) found
Performance
910 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
Quickly explore and analyze data, build prototype data visualizations, and collaborate with your team in real-time with live JavaScript notebooks.
Meta tags
- Title
- Observable Notebooks: Fast data exploration and prototyping
- Description
- Quickly explore and analyze data, build prototype data visualizations, and collaborate with your team in real-time with live JavaScript notebooks.
- Canonical
- https://observablehq.com/
- Language
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1, maximum-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.20.40.35
- 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
- Let's Encrypt
- Subject
- observablehq.com
- Valid from
- Jun 27, 2026
- Valid to
- Sep 25, 2026
- Days until expiry
- 61
- SAN domains
- *.observablehq.com, observablehq.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 6 · H3 3
Links
35 internal · 9 external · 1 broken
Images
58 total · 26 missing alt
Scripts / Styles
36 scripts · 1 stylesheets
JS / CSS size
27.8 KB · 29.1 KB
Page size
170 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 2
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- sitemap.xml not found
Accessibility issues
- More than 20% of images are missing alt text
- Missing <html lang> attribute
Scan details
- Requested URL
- https://observablehq.com
- Final URL
- https://observablehq.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 907 ms
- HTML size
- 170 KB
- Redirect chain
- https://observablehq.com
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Frequently asked questions
- What technology does observablehq.com use?
- observablehq.com is built with Next.js, Google Analytics.
- Is observablehq.com secure (HTTPS)?
- Yes. observablehq.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 25, 2026.
- Who hosts observablehq.com?
- observablehq.com is hosted on Cloudflare, behind Cloudflare CDN.
- What is observablehq.com's SEO score?
- observablehq.com scored 95/100 for SEO in the latest analysis (excellent).
- What is observablehq.com's overall website score?
- observablehq.com has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card