The Sentry Noise Alarm & Guard

Ever wonder if someone entered your room while you were away? The Sentry turns your smartphone into a professional-grade, noise-sensitive security system — no hardware required.

How It Works

Set your sensitivity threshold, tap ARM, and step out. The Sentry listens for sounds — a door opening, footsteps, whispering — and triggers a powerful alarm the moment anything crosses your threshold.

What's New in v2.0

* Camera Trap — front camera silently captures photo evidence of the intruder

* Background Monitoring — system keeps watching even when the app is minimized

* Silent Spy Mode — no alarm, just quiet logging and audio recording

* Full Event Timeline — every armed session, alert, and photo stored locally

* Audio Playback — replay recorded sounds directly from the event log

* Redesigned UI — sleek Material 3 dark interface built for modern Android

Use Cases

* Hotel & Airbnb rooms — portable door alarm when traveling

* Dorm & shared spaces — know if your roommate enters your room

* Home office — monitor your desk or valuables while away

* Baby monitor — get alerted when your baby wakes up

Pro Features

Unlock the full power of The Sentry with a single one-time purchase.

— Camera Trap: front camera captures photo evidence on detection

— Silent Spy Mode: no alarm, secretly logs audio and events

— Audio Recording: record and replay intruder audio

— Background Monitoring: stays active when app is minimized

— Unlimited Event History: full log stored on your device

No subscription. No cloud. Everything stays on your device.