codesandbox.io
CodeSandbox: Instant Cloud Development Environments
Last scanned Jul 26, 2026, 4:25 AM · 1 view
Overall score
Great
Summary
CodeSandbox is a cloud development platform that empowers developers to code, collaborate and ship projects of any size from any device in record time. This website uses Next.js hosted on Cloudflare behind Cloudflare CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: Missing canonical link.
CodeSandbox is a cloud development platform that empowers developers to code, collaborate and ship projects of any size from any device in record time.
- United States
- Hosted on Cloudflare
Top issues to fix
9 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
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.
+3 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
376 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
CodeSandbox is a cloud development platform that empowers developers to code, collaborate and ship projects of any size from any device in record time.
Meta tags
- Title
- CodeSandbox: Instant Cloud Development Environments
- Description
- CodeSandbox is a cloud development platform that empowers developers to code, collaborate and ship projects of any size from any device in record time.
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.64.144.247
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- codesandbox.io
- Valid from
- Jul 14, 2026
- Valid to
- Oct 12, 2026
- Days until expiry
- 77
- SAN domains
- codesandbox.io, *.codesandbox.io, *.sse.codesandbox.io, sse.codesandbox.io
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 2 cookie(s) observed
Content & assets
Headings
H1 1 · H2 6 · H3 7
Links
27 internal · 7 external · 17 broken
Images
1 total · 0 missing alt
Scripts / Styles
40 scripts · 3 stylesheets
JS / CSS size
9.5 KB · 290 KB
Page size
359 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://codesandbox.io
- Final URL
- https://codesandbox.io
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 369 ms
- HTML size
- 359 KB
- Redirect chain
- https://codesandbox.io
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does codesandbox.io use?
- codesandbox.io is built with Next.js, Cloudflare Analytics.
- Is codesandbox.io secure (HTTPS)?
- Yes. codesandbox.io uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 12, 2026.
- Who hosts codesandbox.io?
- codesandbox.io is hosted on Cloudflare, behind Cloudflare CDN.
- What is codesandbox.io's SEO score?
- codesandbox.io scored 75/100 for SEO in the latest analysis (fair).
- What is codesandbox.io's overall website score?
- codesandbox.io has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card