exercism.org
Exercism
Last scanned Aug 5, 2026, 11:00 PM · 9 views
Overall score
Excellent
Summary
Learn, practice and get world-class mentoring in over 50 languages. This website uses Cloudflare Analytics behind Cloudflare CDN. SEO is good (80/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: No structured data (JSON-LD) found.
Learn, practice and get world-class mentoring in over 50 languages. 100% free.
Top issues to fix
5 issues found · 1 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
17 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
3 issue(s) found
Performance
238 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
0 overall since Jul 26, 2026
- Overall
- 92
- SEO
- 80
- Security
- 90
- Performance
- 100
- Accessibility
- 100
Organization
Company details published in this site's own structured data.
Learn, practice and get world-class mentoring in over 50 languages. 100% free.
Meta tags
- Title
- Exercism
- Description
- Learn, practice and get world-class mentoring in over 50 languages. 100% free.
- Canonical
- https://exercism.org
- Language
- en-US
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1, viewport-fit=cover
- Robots meta
- Manifest
- https://exercism.org/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- exercism.org
- Valid from
- Jun 22, 2026
- Valid to
- Sep 20, 2026
- Days until expiry
- 45
- SAN domains
- exercism.org, *.exercism.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 5 · H3 17
Links
123 internal · 10 external · 17 broken
Images
66 total · 1 missing alt
Scripts / Styles
2 scripts · 2 stylesheets
JS / CSS size
0 B · 1.1 KB
Page size
47.2 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://exercism.org
- Final URL
- https://exercism.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 238 ms
- HTML size
- 47.2 KB
- Redirect chain
- https://exercism.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does exercism.org use?
- exercism.org is built with Ruby on Rails, Cloudflare Analytics.
- Is exercism.org secure (HTTPS)?
- Yes. exercism.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 20, 2026.
- Who hosts exercism.org?
- Hosting provider information for exercism.org is not available yet.
- What is exercism.org's SEO score?
- exercism.org scored 80/100 for SEO in the latest analysis (great).
- What is exercism.org's overall website score?
- exercism.org has an overall SiteGraph score of 92/100, combining SEO, performance, security, and accessibility.
- Has exercism.org's score changed over time?
- exercism.org's overall score has stayed steady at 92/100 since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card