Loupe iOS App Reveals Device Fingerprinting Data
Original: Loupe – A iOS app that raises awareness about what native apps can see
Why This Matters
Highlights privacy vulnerabilities in mobile operating systems and promotes user awareness of data collection through device fingerprinting.
Loupe is an open-source iOS app that displays what native applications can access on iPhones and iPads. It reads real values from public APIs to demonstrate device fingerprinting risks, showing users how apps can identify them without personal data.
Loupe is a privacy-focused iOS and iPadOS application developed by mysk-research that provides users visibility into the device fingerprinting surface of their devices. The app reads real values from public iOS APIs that any third-party application can access and presents this information to users in raw form. The core purpose is educational: to demonstrate what data iPhones and iPads expose and explain how these individual readings collectively form a fingerprint that can identify users across different apps and websites. The app addresses a fundamental privacy concern: trackers can recognize users without requiring personal identifiers like names, emails, or locations. Instead, they combine multiple data points from device APIs to create unique fingerprints. Loupe organizes these data points into three tiers based on the accessibility cost of each reading. The project is open-source and available on GitHub, with 771 stars and 32 forks as of the time of this documentation, indicating community interest in privacy awareness tools. The application serves as a practical demonstration of privacy risks inherent in iOS architecture.