addgene.org
Addgene: Powering Scientific Sharing
Last scanned Jul 26, 2026, 5:47 AM
Overall score
Great
Summary
Addgene is a nonprofit repository for plasmids, viral vectors, and recombinant antibodies, plus educational resources, material transfer services, and direct scientist support for researchers worldwide. This website uses Cloudflare Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.
Addgene is a nonprofit repository for plasmids, viral vectors, and recombinant antibodies, plus educational resources, material transfer services, and direct scientist support for researchers worldwide.
- United States
- Hosted on Cloudflare
Top issues to fix
9 issues found · 2 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 X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+3 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
349 ms
Security
HTTPS & header checks
Accessibility
0 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.
- help@addgene.org
Source: https://www.addgene.org/contact/
Meta tags
- Title
- Addgene: Powering Scientific Sharing
- Description
- Addgene is a nonprofit repository for plasmids, viral vectors, and recombinant antibodies, plus educational resources, material transfer services, and direct scientist support for researchers worldwide.
- Canonical
- 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
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.66.43.190
- 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
- www.addgene.org
- Valid from
- Jul 13, 2026
- Valid to
- Oct 11, 2026
- Days until expiry
- 76
- SAN domains
- www.addgene.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 2 cookie(s) observed
Content & assets
Headings
H1 1 · H2 8 · H3 10
Links
102 internal · 49 external · 0 broken
Images
96 total · 0 missing alt
Scripts / Styles
16 scripts · 14 stylesheets
JS / CSS size
105 KB · 596 KB
Page size
212 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 3
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://addgene.org
- Final URL
- https://www.addgene.org/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 345 ms
- HTML size
- 212 KB
- Redirect chain
- https://addgene.org → https://www.addgene.org/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does addgene.org use?
- addgene.org is built with Django, Cloudflare Analytics.
- Is addgene.org secure (HTTPS)?
- Yes. addgene.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 11, 2026.
- Who hosts addgene.org?
- addgene.org is hosted on Cloudflare, behind Cloudflare CDN.
- What is addgene.org's SEO score?
- addgene.org scored 70/100 for SEO in the latest analysis (fair).
- What is addgene.org's overall website score?
- addgene.org has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card