graphviz.org
Graphviz
Last scanned Aug 2, 2026, 3:00 PM · 6 views
Overall score
Great
Summary
Please join the Graphviz forum to ask questions and discuss Graphviz. What is Graphviz? Graphviz is open source graph visualization software. This website uses jQuery. SEO is good (75/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
Please join the Graphviz forum to ask questions and discuss Graphviz. What is Graphviz? Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design, machine learning, and in visual interfaces for other technical domains.
Top issues to fix
9 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
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.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+3 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
301 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
0 overall since Jul 26, 2026
- Overall
- 84
- SEO
- 75
- Security
- 65
- Performance
- 100
- Accessibility
- 100
Organization
Company details published in this site's own structured data.
Please join the Graphviz forum to ask questions and discuss Graphviz. What is Graphviz? Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design, machine learning, and in visual interfaces for other technical domains.
Meta tags
- Title
- Graphviz
- Description
- Please join the Graphviz forum to ask questions and discuss Graphviz. What is Graphviz? Graphviz is open source graph visualization software. Graph visualization is a way of representing structural information as diagrams of abstract graphs and networks. It has important applications in networking, bioinformatics, software engineering, database and web design, machine learning, and in visual interfaces for other technical domains.
- Canonical
- https://graphviz.org/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1, shrink-to-fit=no
- Robots meta
- index, follow
- 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
- graphviz.org
- Valid from
- Jun 11, 2026
- Valid to
- Sep 9, 2026
- Days until expiry
- 37
- SAN domains
- graphviz.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyEnabled
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 6 · H3 0
Links
318 internal · 12 external · 20 broken
Images
2 total · 0 missing alt
Scripts / Styles
6 scripts · 2 stylesheets
JS / CSS size
616 B · 0 B
Page size
101 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://graphviz.org
- Final URL
- https://graphviz.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 299 ms
- HTML size
- 101 KB
- Redirect chain
- https://graphviz.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does graphviz.org use?
- graphviz.org is built with jQuery.
- Is graphviz.org secure (HTTPS)?
- Yes. graphviz.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 9, 2026.
- Who hosts graphviz.org?
- Hosting provider information for graphviz.org is not available yet.
- What is graphviz.org's SEO score?
- graphviz.org scored 75/100 for SEO in the latest analysis (fair).
- What is graphviz.org's overall website score?
- graphviz.org has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.
- Has graphviz.org's score changed over time?
- graphviz.org's overall score has stayed steady at 84/100 since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card