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SGSiteGraph

haskell.org

Haskell Language

Last scanned Aug 1, 2026, 5:00 AM · 9 views

81

Overall score

Great

Summary

The Haskell purely functional programming language home page. This website uses Nginx. SEO is fair (60/100) and accessibility is excellent (90/100). Security scores good (80/100) and performance excellent (100/100). Top issue: Missing canonical link.

The Haskell purely functional programming language home page.

Top issues to fix

9 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 canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

  • Missing OpenGraph tags

    SEO

    Add og:title/og:description/og:image so shared links render a proper preview card.

+3 more issues — details in the sections below.

60

SEO

6 issue(s) found

100

Performance

548 ms

80

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Score history

-2 overall since Jul 25, 2026

Overall
81
SEO
60
Security
80
Performance
100
Accessibility
90

Organization

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

The Haskell purely functional programming language home page.

YouTube

Meta tags

Title
Haskell Language
Description
The Haskell purely functional programming language home page.
Canonical
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

jQueryNginx

Hosting & CDN

Hosting provider
—
CDN provider
—
IP address
—
ASN
—

DNS records

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

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
www-origin.haskell.org
Valid from
Jun 7, 2026
Valid to
Sep 5, 2026
Days until expiry
35
SAN domains
archives.haskell.org, auto-status.haskell.org, blog.hackage.haskell.org, code.haskell.org, darcs.haskell.org, error-stats.haskell.org, errors.haskell.org, get-ghcup.haskell.org, haskell.org, perf.haskell.org, planet-packet-origin.haskell.org, projects.haskell.org, pvp.haskell.org, school.haskell.org, summer.haskell.org, try.haskell.org, wiki-origin.haskell.org, www-origin.haskell.org, www-test.haskell.org, www.haskell.org

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 6 · H3 22

Links

7 internal · 88 external · 20 broken

Images

26 total · 1 missing alt

Scripts / Styles

8 scripts · 3 stylesheets

JS / CSS size

1.8 KB · 0 B

Page size

61.5 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Missing canonical link
  • No H1 heading found
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://haskell.org
Final URL
https://www.haskell.org/
HTTP status
200
HTTP version
HTTP/2
Response time
547 ms
HTML size
61.5 KB
Redirect chain
https://haskell.org → https://www.haskell.org/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does haskell.org use?
haskell.org is built with jQuery, Nginx.
Is haskell.org secure (HTTPS)?
Yes. haskell.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 5, 2026.
Who hosts haskell.org?
Hosting provider information for haskell.org is not available yet.
What is haskell.org's SEO score?
haskell.org scored 60/100 for SEO in the latest analysis (fair).
What is haskell.org's overall website score?
haskell.org has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.
Has haskell.org's score changed over time?
haskell.org's overall score has declined by 2 points (from 83 to 81) since Jul 25, 2026.