OpenHaystack Mobile - Tracking Custom Find My Accessories on Smartphones

In 2021, OpenHaystack on macOS was the first step into liberating Apple's Find My technology to be integrated into any Bluetoothcapable device. By using custom firmware for microchips like the ESP32, it was possible to build custom trackable accessories similar to an Apple AirTag in size and functionality. OpenHaystack Mobile is a cross-platform mobile application that runs on Android and iOS. It extends previous work, which was tied to macOS, to be available to more users. It provides BLE-based location tracking functionality based on Apple's Find My network. We built a cross-platform capable app by using the Flutter framework for the user interface and the cryptographic operations. The user experience is improved compared to a desktop-based app because it allows tracking lost valuables anywhere. Furthermore, the app allows directly route users to lost devices with smartphone navigation apps like Google Maps.