Transforms a phone into a perimeter alarm using the accelerometer and proximity sensor to detect motion, charger or earphone removal, and capture an intruder selfie. Developed by PSNATION STUDIOS for Android devices, Guardian targets commuters, travelers, students, and anyone who leaves a device unattended. The app pairs a loud siren with hardware-level safeguards and adjustable sensitivity so owners can tune detection for public charging, crowded commutes, or shared workspaces.

How the app detects theft scenarios

Guardian uses three hardware signals to spot tampering: accelerometer motion, proximity changes for pocket removal, and cable/earphone disconnect events. The app triggers an audible siren when motion or charger disconnection occurs, and it quietly uses the front camera to take an Intruder Selfie that is stored in a secure evidence vault with a timestamp. These combined triggers let the tool address pickpocketing, unauthorized pickup, and unplugging during charging sessions.

What the app does to stay active and audible

Guardian applies anti-tamper measures that override system volume and resist being silenced by standard buttons, so the siren sounds even if the phone is on silent. The app may request device administrator or overlay permissions to prevent unauthorized closure during an alarm. Exit requires entering the pre-set PIN or pattern inside the app, which enforces an owner-controlled deactivation step.

Who can operate it and how much tuning it requires

Settings include up to ten accelerometer sensitivity levels and a tilt-lock option for flat-surface monitoring, so users can reduce false alarms in busy environments. The app presents guided toggles for motion, pocket removal, charger, and earphone alerts; however, achieving reliable detection may require testing sensitivity in the intended environment. Casual users can use default settings, while frequent travelers benefit from finer calibration.

Practical recommendation and trade-off

Guardian suits users who need a physical-theft alarm that enforces loud alerts and captures evidence, especially for public charging or crowded commutes. The trade-off is that it depends on hardware permissions and careful sensitivity tuning to avoid false triggers. For someone willing to configure detection and grant camera and device-control permissions, Guardian is a practical tool to deter theft and document attempts. Recommended.