plantuml.com
Open-source tool that uses simple textual descriptions to draw beautiful UML diagrams.
Last scanned Aug 3, 2026, 8:00 PM · 6 views
Overall score
Fair
Summary
Easily create beautiful UML Diagrams from simple textual description. This website uses Google Analytics hosted on AWS. SEO is good (80/100) and accessibility is fair (65/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
PlantUML
Easily create beautiful UML Diagrams from simple textual description. There are also numerous kind of available diagrams. It's also possible to export images in PNG, LaTeX, EPS, SVG.
- United States
- Hosted on AWS
Top issues to fix
11 issues found · 4 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.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
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.
+5 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
9 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Score history
+3 overall since Jul 26, 2026
- Overall
- 78
- SEO
- 80
- Security
- 65
- Performance
- 100
- Accessibility
- 65
Organization
Company details published in this site's own structured data.
PlantUML
Easily create beautiful UML Diagrams from simple textual description. There are also numerous kind of available diagrams. It's also possible to export images in PNG, LaTeX, EPS, SVG.
Contact
Email, phone, and address published on this site's own pages.
- plantuml@gmail.com
Meta tags
- Title
- Open-source tool that uses simple textual descriptions to draw beautiful UML diagrams.
- Description
- Easily create beautiful UML Diagrams from simple textual description. There are also numerous kind of available diagrams. It's also possible to export images in PNG, LaTeX, EPS, SVG.
- Canonical
- https://plantuml.com/
- Language
- en
- Charset
- UTF-8
- Viewport
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AWS
- CDN provider
- —
- IP address
- 3.7.161.16
- ASN
- AS16509 (AMAZON-02 - Amazon.com, 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
- plantuml.com
- Valid from
- Jul 25, 2026
- Valid to
- Oct 23, 2026
- Days until expiry
- 80
- SAN domains
- *.plantuml.com, plantuml.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 3 cookie(s) observed
Content & assets
Headings
H1 1 · H2 8 · H3 0
Links
58 internal · 38 external · 0 broken
Images
63 total · 62 missing alt
Scripts / Styles
55 scripts · 1 stylesheets
JS / CSS size
290 KB · 25.8 KB
Page size
82.1 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 5
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Title longer than 60 characters
- Meta description longer than 160 characters
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
- Missing viewport meta tag
Scan details
- Requested URL
- https://plantuml.com
- Final URL
- https://plantuml.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 8 ms
- HTML size
- 82.1 KB
- Redirect chain
- https://plantuml.com
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Frequently asked questions
- What technology does plantuml.com use?
- plantuml.com is built with Google Analytics, Google Ads.
- Is plantuml.com secure (HTTPS)?
- Yes. plantuml.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 23, 2026.
- Who hosts plantuml.com?
- plantuml.com is hosted on AWS.
- What is plantuml.com's SEO score?
- plantuml.com scored 80/100 for SEO in the latest analysis (great).
- What is plantuml.com's overall website score?
- plantuml.com has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.
- What company operates plantuml.com?
- plantuml.com is operated by PlantUML. Easily create beautiful UML Diagrams from simple textual description. There are also numerous kind of available diagrams. It's also possible to export images in PNG, LaTeX, EPS, SVG.
- Has plantuml.com's score changed over time?
- plantuml.com's overall score has improved by 3 points (from 75 to 78) since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card