observablehq.com
Observable Notebooks: Fast data exploration and prototyping
Last scanned Aug 3, 2026, 4:00 AM · 5 views
Overall score
Great
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 behind Cloudflare CDN. SEO is excellent (90/100) and accessibility is good (75/100). Security scores good (85/100) and performance excellent (100/100). Top issue: robots.txt not found.
Quickly explore and analyze data, build prototype data visualizations, and collaborate with your team in real-time with live JavaScript notebooks.
Top issues to fix
7 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.
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.
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 more issue — details in the sections below.
SEO
2 issue(s) found
Performance
850 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Score history
-2 overall since Jul 26, 2026
- Overall
- 88
- SEO
- 90
- Security
- 85
- Performance
- 100
- Accessibility
- 75
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
- —
- CDN provider
- Cloudflare
- 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
- observablehq.com
- Valid from
- Jun 27, 2026
- Valid to
- Sep 25, 2026
- Days until expiry
- 53
- 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 · 20 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
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- robots.txt not found
- 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
- 847 ms
- HTML size
- 170 KB
- Redirect chain
- https://observablehq.com
See something wrong on this report? Request a correction
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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?
- Hosting provider information for observablehq.com is not available yet.
- What is observablehq.com's SEO score?
- observablehq.com scored 90/100 for SEO in the latest analysis (excellent).
- What is observablehq.com's overall website score?
- observablehq.com has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
- Has observablehq.com's score changed over time?
- observablehq.com's overall score has declined by 2 points (from 90 to 88) since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card