string-db.org
STRING: functional protein association networks
Last scanned Jul 26, 2026, 5:47 AM
Overall score
Great
Summary
STRING is a database of known and predicted protein-protein interactions and a functional enrichment tool. This website uses Google Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (90/100) and accessibility is excellent (95/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Multiple H1 headings found.
STRING
STRING is a database of known and predicted protein-protein interactions and a functional enrichment tool.
- United States
- Hosted on Cloudflare
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.
Missing viewport meta tag
AccessibilityAdd <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
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.
5 cookies without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
+2 more issues — details in the sections below.
SEO
2 issue(s) found
Performance
351 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
STRING
STRING is a database of known and predicted protein-protein interactions and a functional enrichment tool.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- STRING: functional protein association networks
- Description
- STRING is a database of known and predicted protein-protein interactions and a functional enrichment tool.
- Canonical
- https://string-db.org
- Language
- en
- Charset
- Viewport
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.66.159.216
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- string-db.org
- Valid from
- Jul 22, 2026
- Valid to
- Oct 20, 2026
- Days until expiry
- 86
- SAN domains
- *.string-db.org, string-db.org
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 2 · H2 9 · H3 0
Links
44 internal · 7 external · 0 broken
Images
53 total · 1 missing alt
Scripts / Styles
12 scripts · 1 stylesheets
JS / CSS size
551 KB · 168 KB
Page size
117 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 64
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Multiple H1 headings found
- Missing OpenGraph tags
Accessibility issues
- Missing viewport meta tag
Scan details
- Requested URL
- https://string-db.org
- Final URL
- https://string-db.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 349 ms
- HTML size
- 117 KB
- Redirect chain
- https://string-db.org
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Frequently asked questions
- What technology does string-db.org use?
- string-db.org is built with Google Analytics.
- Is string-db.org secure (HTTPS)?
- Yes. string-db.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 20, 2026.
- Who hosts string-db.org?
- string-db.org is hosted on Cloudflare, behind Cloudflare CDN.
- What is string-db.org's SEO score?
- string-db.org scored 90/100 for SEO in the latest analysis (excellent).
- What is string-db.org's overall website score?
- string-db.org has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.
- What company operates string-db.org?
- string-db.org is operated by STRING. STRING is a database of known and predicted protein-protein interactions and a functional enrichment tool.
OpenGraph & Twitter Card
OpenGraph
Twitter Card