StackCheck — Data sovereignty starts with transparency
StackCheck analyzes websites to determine their data sovereignty posture by examining where data flows and which services are involved.
Enter a website URL at stackcheck.eu to scan and analyze its infrastructure, backend services, frontend dependencies, and disclosed third-party services.
How it works
When you scan a website, StackCheck performs a comprehensive analysis across four categories: infrastructure (DNS, IP, hosting), backend services (email, payments, auth), frontend integrations (analytics, widgets), and disclosed services (privacy policy parsing). For each detected third-party service, we also scan their infrastructure — because data sovereignty depends on who controls the servers, not just where a company is headquartered.
Scoring
StackCheck calculates a score from 0–100 based on where data flows, using a worst-per-layer approach weighted by layer importance: infrastructure (3x), backend (2x), frontend (1x). EU services score 100, EU-hosted scores 70, unknown scores 30, and non-EU scores 0.
Grades: A++ (95–100, verified), A+ (90–94, verified), A (80–89, max unverified), B (70–79), C (60–69), D (40–59), F (0–39).
Pages
Open source
The detection signatures powering StackCheck are open source under CC0: codeberg.org/xadi/stackcheck-signatures
Contact: hello@stackcheck.eu · Operated by XADI, Netherlands