godbolt.org
Compiler Explorer
Last scanned Jul 26, 2026, 11:19 AM
Overall score
Fair
Summary
Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C++, Rust, Go (and many more) code. This website uses Express hosted on AWS behind CloudFront CDN. SEO is good (75/100) and accessibility is good (75/100). Security scores fair (65/100) and performance fair (60/100). Top issue: Missing canonical link.
Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C++, Rust, Go (and many more) code.
- United States
- Hosted on AWS
Top issues to fix
9 issues found · 3 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.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
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.
+3 more issues — details in the sections below.
SEO
3 issue(s) found
Performance
759 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C++, Rust, Go (and many more) code.
Contact
Email, phone, and address published on this site's own pages.
- matt@godbolt.org
Meta tags
- Title
- Compiler Explorer
- Description
- Compiler Explorer is an interactive online compiler which shows the assembly output of compiled C++, Rust, Go (and many more) code.
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0, user-scalable=no, shrink-to-fit=no
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AWS
- CDN provider
- CloudFront
- IP address
- 108.159.80.109
- ASN
- AS16509 (AMAZON-02 - Amazon.com, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Amazon
- Subject
- godbolt.org
- Valid from
- Jun 23, 2026
- Valid to
- Jan 6, 2027
- Days until expiry
- 162
- SAN domains
- godbolt.org, *.godbo.lt, *.compiler-explorer.com, godbo.lt, compiler-explorer.com, *.godbolt.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 0 · H3 0
Links
3 internal · 18 external · 2 broken
Images
4 total · 1 missing alt
Scripts / Styles
5 scripts · 2 stylesheets
JS / CSS size
12.6 MB · 579 KB
Page size
116 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 1
SEO issues
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
Accessibility issues
- More than 20% of images are missing alt text
- No H1 heading found
Scan details
- Requested URL
- https://godbolt.org
- Final URL
- https://godbolt.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 757 ms
- HTML size
- 116 KB
- Redirect chain
- https://godbolt.org
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Frequently asked questions
- What technology does godbolt.org use?
- godbolt.org is built with Express, Node.js, Nginx.
- Is godbolt.org secure (HTTPS)?
- Yes. godbolt.org uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 6, 2027.
- Who hosts godbolt.org?
- godbolt.org is hosted on AWS, behind CloudFront CDN.
- What is godbolt.org's SEO score?
- godbolt.org scored 75/100 for SEO in the latest analysis (fair).
- What is godbolt.org's overall website score?
- godbolt.org has an overall SiteGraph score of 69/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card