diigo.com
Diigo - Better reading and research with annotation, highlighter, sticky notes, archiving, bookmarking & more.
Last scanned Jul 21, 2026, 12:33 PM · 1 view
Overall score
Fair
Top issues to fix
14 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.
+8 more issues — details in the sections below.
Summary
Diigo is a powerful research tool and a knowledge-sharing community. This website uses Nginx hosted on AWS. SEO is fair (60/100) and accessibility is fair (50/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
SEO
6 issue(s) found
Performance
522 ms
Security
HTTPS & header checks
Accessibility
3 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
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
- AWS
- CDN provider
- —
- IP address
- 54.148.192.94
- ASN
- AS16509 (AMAZON-02 - Amazon.com, Inc., US)
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
- 63
- 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 · 6 external · 3 broken
Images
5 total · 5 missing alt
Scripts / Styles
5 scripts · 2 stylesheets
JS / CSS size
94.2 KB · 15.5 KB
Page size
11.7 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 29
- 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
- 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
- 522 ms
- HTML size
- 11.7 KB
- Redirect chain
- https://diigo.com → https://www.diigo.com/
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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?
- diigo.com is hosted on AWS.
- What is diigo.com's SEO score?
- diigo.com scored 60/100 for SEO in the latest analysis (fair).
- What is diigo.com's overall website score?
- diigo.com has an overall SiteGraph score of 69/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card