StackLens - Web Tech, Infra & Security Analyzer

Inspect web technologies, DNS/IP infrastructure, CVE vulnerabilities, and company leads — 100% open-source.

StackLens is a free, open-source, and serverless browser extension that analyzes the technical architecture, infrastructure, security posture, and metadata of websites you visit. 🔗Source Code: https://github.com/tumsomprasong/StackLens Designed for developers, security auditors, and technical researchers, StackLens runs entirely in your local browser without third-party tracking, telemetry, or account requirements. KEY CAPABILITIES 1. In-Depth Web Technology Fingerprinting StackLens evaluates webpage composition using a multi-layer inspection engine covering URLs, HTTP headers, cookies, scripts, DOM selectors, CSS rules, and global variables: • Modern Web Frameworks: Identifies client-side libraries, single-page application engines, and server-side rendering systems. • User Interface & Styling: Detects modern CSS architectures, design systems, and component libraries. • Authentication & Identity: Recognizes enterprise Single Sign-On (SSO), federated identity providers, and token-based authentication mechanisms through local structure inspection. • Web Servers & Infrastructure: Accurately identifies backend server software and underlying operating system environments. 2. Network & Infrastructure Insights • Encrypted DNS Records: Queries live A, AAAA, CNAME, MX, TXT, and NS records directly through DNS-over-HTTPS. • IP & Hosting Geolocation: Displays target IPv4 addresses, autonomous system numbers (ASN), hosting providers, and geographic location. • Header Inspection: Captures and inspects active HTTP response headers. 3. Automated Security Auditing • Vulnerability Lookup: Checks detected software versions against the public OSV.dev (Open Source Vulnerabilities) database in real time. • Severity Indicators: Highlights reported advisories with standardized risk severity ratings. • Configurable: Security queries can be toggled on or off in the settings panel to prioritize scanning speed. 4. Public Contact & Metadata Extraction • Contact Discovery: Surfaces publicly visible contact emails and telephone links with one-click copy actions. • Social Channels: Identifies official organization social profiles linked on the page. • Structured Data: Previews OpenGraph metadata and structured Schema.org (JSON-LD) blocks. 5. High-Density Interface & Settings • Optimized 2-Column Layout: Displays analysis results cleanly with zero wasted screen space. • Dark & Light Modes: Supports both dark and high-contrast light themes with persistent preferences. • Unified Export: Download complete site reports in either JSON or CSV format with a single click. • Cache Management: View storage usage and purge local cache on demand to force instant re-scans. • Keyboard Navigation: Quick search with [/], tab switching with arrow keys, and dismissal with [Esc]. PRIVACY COMMITMENT • Zero Telemetry: StackLens never collects, stores, or transmits your browsing history or personal data. • Direct Public Queries: All network queries connect directly to standard public APIs from your browser. • Safe Inspection: Token analysis inspects only structural metadata in local memory; secrets and credentials are never stored. • Open Source: Distributed under the GNU General Public License v3.0 (GPL-3.0-only).