crossref.org
Crossref
Last scanned Jul 24, 2026, 8:25 PM · 1 view
Overall score
Fair
Summary
Crossref runs open infrastructure to link the world's research outputs. This website uses jQuery hosted on AWS behind CloudFront CDN. SEO is good (80/100) and accessibility is good (75/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: No H1 heading found.
Crossref runs open infrastructure to link the world's research outputs. 25,000+ members, 167 countries, 2.1 billion monthly API queries.
- United States
- Hosted on AWS
Top issues to fix
8 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.
+2 more issues — details in the sections below.
SEO
2 issue(s) found
Performance
202 ms
Security
HTTPS & header checks
Accessibility
2 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.
Source: https://crossref.org/support
Meta tags
- Title
- Crossref
- Description
- Crossref runs open infrastructure to link the world's research outputs. 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
- AWS
- CDN provider
- CloudFront
- IP address
- 34.205.57.5
- 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 1.3
- Issuer
- Amazon
- Subject
- crossref.org
- Valid from
- Jun 10, 2026
- Valid to
- Dec 24, 2026
- Days until expiry
- 153
- 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 · 2 broken
Images
9 total · 2 missing alt
Scripts / Styles
22 scripts · 8 stylesheets
JS / CSS size
287 KB · 445 KB
Page size
34.2 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 3
- sitemap.xml
- Found
- URLs in sitemap
- 1678
SEO issues
- No H1 heading found
- No structured data (JSON-LD) found
Accessibility issues
- More than 20% of images are missing alt text
- No H1 heading found
Careers
This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.
Scan details
- Requested URL
- https://crossref.org
- Final URL
- https://crossref.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 202 ms
- HTML size
- 34.2 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?
- crossref.org is hosted on AWS, behind CloudFront CDN.
- What is crossref.org's SEO score?
- crossref.org scored 80/100 for SEO in the latest analysis (great).
- What is crossref.org's overall website score?
- crossref.org has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.
- Is crossref.org hiring?
- crossref.org has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card