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Use CheckWebs as a free Wappalyzer alternative to detect website technologies and connect them with headers, DNS, server location, performance, and security checks.
Recommended workflow
Detect likely CMS, framework, analytics, CDN, and frontend library signals.
Open Tech Stack DetectorOpen meta tags and HTTP headers to confirm signals that the detector found.
Open Meta Tags CheckerUse page weight, security headers, and HTTP/3 checks to understand operational quality.
Open Page Weight AnalyzerBest fit
Not built for
Included checks
Identify technologies, frameworks, and CMS used by a website
Inspect all meta tags including Open Graph and Twitter Cards
Inspect all HTTP response headers
Grade your security headers (CSP, HSTS, X-Frame, etc.)
Analyze total page size, resources, and compression
Check if a website supports HTTP/2 or HTTP/3 (QUIC)
Look up all DNS records for any domain
Find where a website's server is physically located
Comparison
FAQ
No detector can guarantee every technology. CheckWebs uses public signals and pairs them with headers, DNS, and page checks for more context.
No. The checks run from the web app, so you can use them without installing an extension.
The stack only tells you what is present. Page weight, HTTP/3, and security checks show whether the implementation is healthy.
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