A research and diagnostic Android app that detects active VPN connections on the device using the same signals that anti-fraud SDKs rely on. Why this exists Mobile anti-fraud SDKs in banking, e-commerce, and identity-verification apps silently fingerprint devices for VPN usage. The detection signals they use are undocumented and scattered across Android APIs. This project collects and implements those signals in a single open-source app, so that: Security researchers can study what data anti-fraud SDKs actually harvest Privacy-conscious users can see exactly what their device reveals about VPN usage QA engineers can verify that their VPN-detection logic triggers correctly on test devices