diigo.com
Diigo - Better reading and research with annotation, highlighter, sticky notes, archiving, bookmarking & more.
Last scanned Jul 29, 2026, 6:00 PM · 6 views
Overall score
Fair
Summary
Diigo is a powerful research tool and a knowledge-sharing community. This website uses Nginx. SEO is fair (55/100) and accessibility is fair (50/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
Diigo is a powerful research tool and a knowledge-sharing community
Top issues to fix
15 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.
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.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
+9 more issues — details in the sections below.
SEO
7 issue(s) found
Performance
525 ms
Security
HTTPS & header checks
Accessibility
3 issue(s) found
Score history
-1 overall since Jul 21, 2026
- Overall
- 68
- SEO
- 55
- Security
- 65
- Performance
- 100
- Accessibility
- 50
Organization
Company details published in this site's own structured data.
Diigo is a powerful research tool and a knowledge-sharing community
Meta tags
- Title
- Diigo - Better reading and research with annotation, highlighter, sticky notes, archiving, bookmarking & more.
- Description
- Diigo is a powerful research tool and a knowledge-sharing community
- Canonical
- 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
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- DigiCert Inc
- Subject
- *.diigo.com
- Valid from
- Aug 22, 2025
- Valid to
- Sep 22, 2026
- Days until expiry
- 55
- SAN domains
- *.diigo.com, diigo.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 5 cookie(s) observed
Content & assets
Headings
H1 0 · H2 0 · H3 0
Links
9 internal · 5 external · 14 broken
Images
5 total · 5 missing alt
Scripts / Styles
4 scripts · 2 stylesheets
JS / CSS size
2.2 KB · 0 B
Page size
11.7 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Title longer than 60 characters
- 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
- Over half of images are missing alt text
- No H1 heading found
- Missing <html lang> attribute
Scan details
- Requested URL
- https://diigo.com
- Final URL
- https://www.diigo.com/
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 525 ms
- HTML size
- 11.7 KB
- Redirect chain
- https://diigo.com → https://www.diigo.com/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does diigo.com use?
- diigo.com is built with jQuery, Google Analytics, Nginx.
- Is diigo.com secure (HTTPS)?
- Yes. diigo.com uses TLS 1.2 with a certificate issued by DigiCert Inc, valid until Sep 22, 2026.
- Who hosts diigo.com?
- Hosting provider information for diigo.com is not available yet.
- What is diigo.com's SEO score?
- diigo.com scored 55/100 for SEO in the latest analysis (fair).
- What is diigo.com's overall website score?
- diigo.com has an overall SiteGraph score of 68/100, combining SEO, performance, security, and accessibility.
- Has diigo.com's score changed over time?
- diigo.com's overall score has declined by 1 point (from 69 to 68) since Jul 21, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card