Frequently Asked Questions

SentryRF is a counter-surveillance Android app with on-device AI that detects hidden tracking devices like Apple AirTags, Tile trackers, Samsung SmartTags, and GPS devices. It uses Bluetooth and WiFi scanning to find wireless trackers, an on-device AI to classify threats, and Physical Sweep sensors (EMF, acoustic, pressure, light) to detect hidden cameras, electronic bugs, and other surveillance equipment. All AI training and processing happens locally on your phone.

Via Bluetooth/WiFi scanning: Apple AirTags, Tile trackers, Samsung SmartTags, unknown BLE beacons, WiFi-enabled trackers, and any broadcasting Bluetooth device. Via Physical Sweep: powered electronics hidden in walls or furniture (EMF), cheap spy cameras with ultrasonic oscillators (acoustic), infrared night-vision cameras (light sensor), and recently accessed sealed compartments (barometric pressure).

Physical Sweep is a feature that uses four of your phone's physical sensors simultaneously: the magnetometer for electromagnetic field detection, the microphone for ultrasonic emissions, the barometer for pressure changes in sealed spaces, and the ambient light sensor for infrared LED detection.

Physical Sweep uses consumer-grade phone sensors and can reliably detect powered electronics, cheap spy cameras, IR cameras, and sealed compartments. However, it cannot detect passive (unpowered) devices, professional-grade shielded equipment, powered-off devices, or devices inside metal enclosures. Building materials like rebar can cause false EMF readings, and acoustic detection requires a quiet environment. For high-stakes situations (corporate espionage, legal proceedings), professional counter-surveillance services with dedicated equipment are recommended. SentryRF is best used as a first-pass screening tool.

Parking Lot Mode is a dedicated vehicle sweep feature. When you park your car, activate Parking Lot Mode and walk around your vehicle to establish a baseline of nearby devices. On subsequent visits, SentryRF compares new scan results against your baseline and alerts you to any new or suspicious trackers that weren't previously present — such as a GPS tracker placed under your car.

Absolutely. All scan data, device history, threat logs, and settings are stored locally on your device — never uploaded to any server or cloud service. Data is automatically deleted after 30 days by default (adjustable from 7 to 90 days in Settings). SentryRF requires no account or sign-in, includes no analytics telemetry, and you can export or delete all data at any time from the Privacy & Security settings.

SentryRF is currently Android-only. iOS restricts the low-level Bluetooth scanning, WiFi access, and hardware sensor APIs that SentryRF requires for effective counter-surveillance detection. Apple's platform limitations make it impossible to replicate the same level of scanning capability on iPhone.

Yes. SentryRF scans both Bluetooth and WiFi bands to detect trackers that operate on either frequency. For devices that don't broadcast wirelessly (wired cameras, passive GPS loggers), use the Physical Sweep feature to detect their electromagnetic signatures instead.

SentryRF watches the WiFi networks around you for signs of attack. It can detect fake networks pretending to be a real one (like a hotel or café WiFi), connections that suddenly become less secure, suspicious login pages designed to steal your passwords, and networks coming from unusual hardware. If you're already connected to a risky network, SentryRF warns you immediately.

Safe Zones let you mark trusted locations like your home or office. SentryRF takes a snapshot of all the devices normally present in that area, and from then on, only alerts you about new or unfamiliar devices. This dramatically reduces false alarms from your own devices, your neighbor's gadgets, and other harmless equipment you see every day.

Timeline Replay lets you watch a suspicious device's movement history play back on a map — like pressing rewind on a security camera. You can see exactly where the device was spotted, when it appeared at each location, and whether it's been following the same route as you. This is especially useful for building evidence or confirming that a device has been tracking you over time.

Yes — if you enable "Start on Boot" in Settings, SentryRF will automatically begin background scanning whenever your phone turns on. You'll never have a gap in protection, even after a restart or software update.

SentryRF comes with a 7-day free trial that gives you full access to every feature — nothing is locked or limited. After the trial, a subscription through Google Play keeps everything active. You can cancel anytime during the trial at no cost. See the Pricing page for details.

SentryRF includes a pure on-device AI that spots threats using advanced AI — sighting patterns, signal behavior, geographic spread, and more. It learns implicitly from your actions: whitelisting a device teaches it what's safe, keeping an alert teaches it what's suspicious. All training happens locally on your phone — no data is ever sent to any server. The AI also powers the Sound Locator with adaptive per-device calibration, tuning signal parameters for each specific tracker type.

SentryRF is available on Google Play. Download it for free — no account required. The Pro subscription unlocks advanced features and can be purchased directly in the app.