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sei.org

Stockholm Environment Institute: bridging science and policy

Last scanned Jul 26, 2026, 7:46 AM

81

Overall score

Great

Summary

Stockholm Environment Institute is an international non-profit research institute that tackles environment and sustainable development challenges. This website uses WordPress behind Cloudflare CDN. SEO is good (80/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: No H1 heading found.

Stockholm Environment Institute is an international non-profit research institute that tackles environment and sustainable development challenges.

Top issues to fix

8 issues found · 3 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • No H1 heading found

    SEO

    Add 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

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

80

SEO

3 issue(s) found

90

Performance

1.12 s

65

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

Stockholm Environment Institute is an international non-profit research institute that tackles environment and sustainable development challenges.

X (Twitter)FacebookLinkedInYouTube

Contact

Email, phone, and address published on this site's own pages.

Meta tags

Title
Stockholm Environment Institute: bridging science and policy
Description
Stockholm Environment Institute is an international non-profit research institute that tackles environment and sustainable development challenges.
Canonical
https://www.sei.org/
Language
en-GB
Charset
UTF-8
Viewport
width=device-width
Robots meta
index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
Stockholm Environment Institute
og:description
Stockholm Environment Institute (SEI) is an international non-profit research and policy organization. We shift policy and practice towards sustainability.
og:type
website
og:url
https://www.sei.org/

Twitter Card

twitter:card
summary_large_image
twitter:title
Home
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

WordPressjQueryCloudflare Analytics

Hosting & CDN

Hosting provider
—
CDN provider
Cloudflare
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Google Trust Services
Subject
sei.org
Valid from
Jun 24, 2026
Valid to
Sep 22, 2026
Days until expiry
55
SAN domains
sei.org, *.sei.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 5 · H3 0

Links

77 internal · 5 external · 20 broken

Images

24 total · 1 missing alt

Scripts / Styles

29 scripts · 2 stylesheets

JS / CSS size

82.3 KB · 135 B

Page size

158 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
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://sei.org
Final URL
https://www.sei.org/
HTTP status
200
HTTP version
HTTP/2
Response time
1.12 s
HTML size
158 KB
Redirect chain
https://sei.org → https://www.sei.org/

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Frequently asked questions

What technology does sei.org use?
sei.org is built with WordPress, jQuery, Cloudflare Analytics.
Is sei.org secure (HTTPS)?
Yes. sei.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 22, 2026.
Who hosts sei.org?
Hosting provider information for sei.org is not available yet.
What is sei.org's SEO score?
sei.org scored 80/100 for SEO in the latest analysis (great).
What is sei.org's overall website score?
sei.org has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.