vtk.org
VTK - The Visualization Toolkit
Last scanned Aug 24, 2026, 1:23 PM
Overall score
Fair
Summary
This website uses WordPress. SEO is fair (55/100) and accessibility is fair (60/100). Security scores good (85/100) and performance excellent (100/100). Top issue: Missing meta description.
Top issues to fix
10 issues found · 4 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
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.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+4 more issues — details in the sections below.
SEO
6 issue(s) found
Performance
237 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
Meta tags
- Title
- VTK - The Visualization Toolkit
- Description
- Canonical
- https://vtk.org/
- Language
- en-US
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0
- Robots meta
- max-image-preview:large
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- 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.vtk.org
- Valid from
- Aug 19, 2026
- Valid to
- Nov 17, 2026
- Days until expiry
- 84
- SAN domains
- vtk.org, www.vtk.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 2 · H3 3
Links
25 internal · 26 external · 3 broken
Images
5 total · 3 missing alt
Scripts / Styles
19 scripts · 5 stylesheets
JS / CSS size
4.5 KB · 40.1 KB
Page size
71.1 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing meta description
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
- No H1 heading found
Scan details
- Requested URL
- https://vtk.org
- Final URL
- https://vtk.org
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 236 ms
- HTML size
- 71.1 KB
- Redirect chain
- https://vtk.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does vtk.org use?
- vtk.org is built with WordPress, jQuery, Google Analytics, Apache.
- Is vtk.org secure (HTTPS)?
- Yes. vtk.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 17, 2026.
- Who hosts vtk.org?
- Hosting provider information for vtk.org is not available yet.
- What is vtk.org's SEO score?
- vtk.org scored 55/100 for SEO in the latest analysis (fair).
- What is vtk.org's overall website score?
- vtk.org has an overall SiteGraph score of 75/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card