perimeterinstitute.ca
Homepage | Perimeter Institute
Last scanned Jul 27, 2026, 4:43 PM
Overall score
Great
Summary
From quarks to black holes & beyond, explore free physics lectures, seminars, & courses for teachers & students from high school to post university. This website uses Drupal hosted on Cloudflare behind Cloudflare CDN. SEO is good (80/100) and accessibility is fair (70/100). Security scores good (80/100) and performance excellent (100/100). Top issue: No structured data (JSON-LD) found.
From quarks to black holes & beyond, explore free physics lectures, seminars, & courses for teachers & students from high school to post university.
- United States
- Hosted on Cloudflare
Top issues to fix
7 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.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
+1 more issue — details in the sections below.
SEO
3 issue(s) found
Performance
930 ms
Security
HTTPS & header checks
Accessibility
1 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
- Homepage | Perimeter Institute
- Description
- From quarks to black holes & beyond, explore free physics lectures, seminars, & courses for teachers & students from high school to post university.
- Canonical
- https://perimeterinstitute.ca/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.66.168.53
- 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
- Google Trust Services
- Subject
- perimeterinstitute.ca
- Valid from
- Jul 27, 2026
- Valid to
- Oct 25, 2026
- Days until expiry
- 89
- SAN domains
- perimeterinstitute.ca
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 6 · H3 9
Links
52 internal · 9 external · 1 broken
Images
13 total · 9 missing alt
Scripts / Styles
27 scripts · 58 stylesheets
JS / CSS size
1.1 KB · 0 B
Page size
65.3 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 36
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
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://perimeterinstitute.ca
- Final URL
- https://perimeterinstitute.ca
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 929 ms
- HTML size
- 65.3 KB
- Redirect chain
- https://perimeterinstitute.ca
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does perimeterinstitute.ca use?
- perimeterinstitute.ca is built with Drupal, jQuery, Google Analytics.
- Is perimeterinstitute.ca secure (HTTPS)?
- Yes. perimeterinstitute.ca uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 25, 2026.
- Who hosts perimeterinstitute.ca?
- perimeterinstitute.ca is hosted on Cloudflare, behind Cloudflare CDN.
- What is perimeterinstitute.ca's SEO score?
- perimeterinstitute.ca scored 80/100 for SEO in the latest analysis (great).
- What is perimeterinstitute.ca's overall website score?
- perimeterinstitute.ca has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
- Is perimeterinstitute.ca hiring?
- perimeterinstitute.ca has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card