gnu.org
The GNU Operating System and the Free Software Movement
Last scanned Jul 29, 2026, 7:00 PM · 11 views
Overall score
Great
Summary
Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use. This website uses Apache. SEO is fair (60/100) and accessibility is excellent (90/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing canonical link.
Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
Top issues to fix
8 issues found · 2 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
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.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
+2 more issues — details in the sections below.
SEO
6 issue(s) found
Performance
495 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Score history
0 overall since Jul 15, 2026
- Overall
- 84
- SEO
- 60
- Security
- 90
- Performance
- 100
- Accessibility
- 90
Organization
Company details published in this site's own structured data.
Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- The GNU Operating System and the Free Software Movement
- Description
- Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- 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
- wildebeest1p.gnu.org
- Valid from
- Jul 9, 2026
- Valid to
- Oct 7, 2026
- Days until expiry
- 69
- SAN domains
- classpath.org, digitalspeech.org, donate.digitalspeech.org, dotgnu.org, emacs.org, glibc.gnu.org, gnewsense.org, gnu.org, gnukids.org, gplfaq.org, hurd.gnu.org, ipv6.nongnu.org, playfreedom.org, playogg.com, playogg.org, upgradefromwindows.com, upgradefromwindows8.org, vcdimager.org, wildebeest.ipv6.gnu.org, wildebeest1p.gnu.org, www.classpath.org, www.digitalspeech.org, www.emacs.org, www.gnu.org, www.gnukids.org, www.hurd.gnu.org, www.ipv6.gnu.org, www.ipv6.nongnu.org, www.nongnu.org, www.playfreedom.org, www.playogg.com, www.upgradefromwindows.com, www.upgradefromwindows8.org, www6.gnu.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 4 · H3 2
Links
72 internal · 27 external · 20 broken
Images
13 total · 0 missing alt
Scripts / Styles
0 scripts · 2 stylesheets
JS / CSS size
0 B · 2.8 KB
Page size
31.0 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://gnu.org
- Final URL
- https://www.gnu.org/
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 495 ms
- HTML size
- 31.0 KB
- Redirect chain
- https://gnu.org → https://www.gnu.org/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does gnu.org use?
- gnu.org is built with Apache.
- Is gnu.org secure (HTTPS)?
- Yes. gnu.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 7, 2026.
- Who hosts gnu.org?
- Hosting provider information for gnu.org is not available yet.
- What is gnu.org's SEO score?
- gnu.org scored 60/100 for SEO in the latest analysis (fair).
- What is gnu.org's overall website score?
- gnu.org has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.
- Has gnu.org's score changed over time?
- gnu.org's overall score has stayed steady at 84/100 since Jul 15, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card