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A free BuiltWith alternative for detecting website tech stacks, CMS signals, frameworks, CDN clues, hosting hints, headers, and infrastructure context.
Recommended workflow
Run the tech stack detector to identify CMS, frameworks, analytics, CDN, and platform signals.
Open Tech Stack DetectorUse headers, IP lookup, server location, and DNS checks to confirm edge and hosting clues.
Open HTTP Headers AnalyzerFor popular domains, use built-with answer pages that package the check into a shareable research page.
Open Tech Stack DetectorBest fit
Not built for
Included checks
Identify technologies, frameworks, and CMS used by a website
Inspect all HTTP response headers
Find where a website's server is physically located
Find the IP address and geolocation of any domain
Look up all DNS records for any domain
Inspect all meta tags including Open Graph and Twitter Cards
Grade your security headers (CSP, HSTS, X-Frame, etc.)
Check if a website supports HTTP/2 or HTTP/3 (QUIC)
Comparison
FAQ
No. CheckWebs focuses on live technology detection and related technical checks, not a historical lead database.
The tech stack detector looks for public fingerprints in HTML, scripts, headers, assets, and platform-specific patterns.
Run headers, DNS, IP, server location, security headers, and HTTP/3 checks to validate infrastructure signals.
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