codeforces.com
Codeforces
Last scanned Jul 29, 2026, 7:00 PM · 6 views
Overall score
Great
Summary
Codeforces. This website uses Google Analytics behind Cloudflare CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (90/100). Top issue: Missing canonical link.
Codeforces. Programming competitions and contests, programming community
Top issues to fix
7 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.
3 cookies without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
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.
+1 more issue — details in the sections below.
SEO
4 issue(s) found
Performance
330 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
+6 overall since Jul 21, 2026
- Overall
- 88
- SEO
- 75
- Security
- 90
- Performance
- 90
- Accessibility
- 100
Organization
Company details published in this site's own structured data.
Codeforces. Programming competitions and contests, programming community
Meta tags
- Title
- Codeforces
- Description
- Codeforces. Programming competitions and contests, programming community
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=0.01
- Robots meta
- index, follow
- Manifest
- https://codeforces.com/manifest.json
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
- codeforces.com
- Valid from
- Jul 1, 2026
- Valid to
- Sep 29, 2026
- Days until expiry
- 61
- SAN domains
- codeforces.com, *.codeforces.com
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 3 cookie(s) observed
Content & assets
Headings
H1 1 · H2 3 · H3 4
Links
358 internal · 24 external · 20 broken
Images
110 total · 9 missing alt
Scripts / Styles
75 scripts · 22 stylesheets
JS / CSS size
42.9 KB · 4.8 KB
Page size
177 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 structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://codeforces.com
- Final URL
- https://codeforces.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 327 ms
- HTML size
- 177 KB
- Redirect chain
- https://codeforces.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does codeforces.com use?
- codeforces.com is built with jQuery, Google Analytics, Cloudflare Analytics.
- Is codeforces.com secure (HTTPS)?
- Yes. codeforces.com uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 29, 2026.
- Who hosts codeforces.com?
- Hosting provider information for codeforces.com is not available yet.
- What is codeforces.com's SEO score?
- codeforces.com scored 75/100 for SEO in the latest analysis (fair).
- What is codeforces.com's overall website score?
- codeforces.com has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
- Has codeforces.com's score changed over time?
- codeforces.com's overall score has improved by 6 points (from 82 to 88) since Jul 21, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card