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.

exercism.org

Exercism

Last scanned Jul 26, 2026, 5:47 AM

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
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.
20 broken links on the page
SEO
Fix or remove broken links — they waste crawl budget and erode user trust.

SEO

3 issue(s) found

100

Performance

37 ms

Security

HTTPS & header checks

100

Accessibility

0 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.

Learn, practice and get world-class mentoring in over 50 languages. 100% free.

X (Twitter)Facebook GitHub

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.

Ruby on Rails Cloudflare Analytics

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: 53
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 · 20 broken

Images

66 total · 1 missing alt

Scripts / Styles

2 scripts · 2 stylesheets

JS / CSS size

0 B · 1.1 KB

Page size

47.3 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

Scan details

Requested URL: https://exercism.org
Final URL: https://exercism.org
HTTP status: 200
HTTP version: HTTP/2
Response time: 37 ms
HTML size: 47.3 KB
Redirect chain: https://exercism.org

See something wrong on this report? Request a correction

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.