DeepStack — Tech Stack & Architecture Inspector

See how any website is built: frameworks, hosting, APIs, security headers and design tokens, with the evidence behind each finding.

DeepStack shows you how the website in your current tab is built. Click the toolbar icon to get a structured report you can read in under a minute. Every finding shows its evidence, such as the script URL, response header or page markup it was based on, along with a confidence score. You can check each result yourself instead of trusting a label. WHAT THE REPORT COVERS Stack The frameworks, libraries, content platforms, hosting and third-party services the page uses, grouped by category, with versions where the page exposes them. App internals How the page is rendered (server-rendered, static, client-side or streamed), build tool fingerprints, service workers, and the names of browser storage keys. Network and APIs Server response time, protocol, compression and cache status. It also lists the API endpoints the page called, the third-party domains it contacted, and the services allowed by its Content Security Policy. Security Checks HTTPS, HSTS, Content Security Policy, clickjacking protection and the other common security headers, and gives a letter grade with a plain-English explanation for each check. Cookies are audited for their security flags by name only. Design and SEO The color palette (click a color to copy it), fonts, CSS custom properties, structured data and canonical metadata. Export Copy the full report as Markdown or JSON, or download it, for audits, documentation or client handoffs. PRIVACY All analysis runs locally in your browser. DeepStack has no servers, no analytics and no accounts. It never reads cookie values, storage values or anything you type into forms. Optionally, you can turn on DNS lookups in the report's settings to identify a site's hosting and email providers from its public DNS records. This is off by default. When on, only the domain name is sent, to a public DNS-over-HTTPS resolver. DeepStack is free and open source: https://github.com/EmmanouelKontos/deepstack