crossref.org
Crossref
Last scanned Jul 31, 2026, 10:00 PM · 7 views
Overall score
Fair
Summary
Crossref is open infrastructure linking the world's research. This website uses jQuery behind CloudFront CDN. SEO is fair (70/100) and accessibility is good (75/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: No H1 heading found.
Crossref is open infrastructure linking the world's research. 25,000+ members, 167 countries, 2.1 billion monthly API queries.
Top issues to fix
10 issues found · 3 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.
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.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+4 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
249 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Score history
-1 overall since Jul 24, 2026
- Overall
- 77
- SEO
- 70
- Security
- 65
- Performance
- 100
- Accessibility
- 75
Organization
Company details published in this site's own structured data.
Meta tags
- Title
- Crossref
- Description
- Crossref is open infrastructure linking the world's research. 25,000+ members, 167 countries, 2.1 billion monthly API queries.
- Canonical
- https://www.crossref.org/
- Language
- en-us
- 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
- CloudFront
- 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
- Amazon
- Subject
- crossref.org
- Valid from
- Jun 10, 2026
- Valid to
- Dec 24, 2026
- Days until expiry
- 146
- SAN domains
- crossref.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 4 · H3 4
Links
64 internal · 12 external · 20 broken
Images
9 total · 2 missing alt
Scripts / Styles
22 scripts · 8 stylesheets
JS / CSS size
4.3 KB · 0 B
Page size
34.1 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No H1 heading found
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- More than 20% of images are missing alt text
- No H1 heading found
Scan details
- Requested URL
- https://crossref.org
- Final URL
- https://crossref.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 249 ms
- HTML size
- 34.1 KB
- Redirect chain
- https://crossref.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does crossref.org use?
- crossref.org is built with Bootstrap, jQuery.
- Is crossref.org secure (HTTPS)?
- Yes. crossref.org uses TLS 1.3 with a certificate issued by Amazon, valid until Dec 24, 2026.
- Who hosts crossref.org?
- Hosting provider information for crossref.org is not available yet.
- What is crossref.org's SEO score?
- crossref.org scored 70/100 for SEO in the latest analysis (fair).
- What is crossref.org's overall website score?
- crossref.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.
- Has crossref.org's score changed over time?
- crossref.org's overall score has declined by 1 point (from 78 to 77) since Jul 24, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card