Built-in tracker alerts miss most of what stalkers actually use.
SentryRF turns an Android phone into a counter-surveillance tool that finds unbranded trackers, hidden cameras and fake cell towers, with every bit of analysis staying on the device.
The story
Android and iOS now warn about unknown trackers, but only trackers that cooperate with the industry standard.
Built-in unknown tracker alerts
- Major-brand trackers that follow the standard
- Alerts after a tracker travels with you
- No hidden camera detection
- No fake cell tower detection
- No help physically locating unbranded devices
SentryRF
- Branded, unbranded and MAC-rotating trackers
- Follower and planted-tracker patterns over days
- Hidden cameras via infrared detection
- Rogue cell towers and IMSI catchers
- Drones and their pilots' location
- Sound locator, Paired Sweep and UWB ranging
Six things worth knowing
What makes SentryRF different from other detector apps.
1. Rogue cell tower and IMSI catcher detection
Thirteen network checks flag fake base stations, including forced 2G downgrades, unfamiliar towers at known locations, towers with no neighbours and physical cell ID conflicts.
2. Hidden cameras, found by their infrared
Night-vision cameras use infrared LEDs the eye cannot see. The phone's front camera can, and SentryRF uses it to spot them, alongside magnetometer and ultrasonic sweeps for hidden electronics.
3. Trackers that try to hide
Beyond AirTag, SmartTag, Tile and Chipolo, SentryRF detects unbranded trackers, cloned and spoofed devices, and trackers that rotate their Bluetooth address to avoid being recognised.
4. Behaviour, not just presence
A device nearby is not a threat. A device that appears at home, at work and on the road is. SentryRF learns the user's normal environment and flags devices that follow them over time.
5. Drones, and where their pilots are
A drone's Remote ID broadcast includes where its pilot is standing, or where it took off. SentryRF plots the drone and the pilot on a map with the distance between them, names the make and model from the 7.7 million serial numbers declared to the FAA, and puts it all in a signed evidence report.
6. Nothing leaves the phone
No account, no login, no servers and no analytics. All AI runs on-device, so the app works with mobile data and WiFi switched off, and SentryRF never sees what users find.
Fact sheet
| App | SentryRF |
| Developer | SentryRF |
| Platforms | Android phones and tablets, Wear OS. Optional SentryPod hardware sensor. |
| Availability | Google Play and Amazon Appstore |
| Pricing | Free to download. Full access free for 7 days with no card required, then an optional subscription. |
| Detects | Bluetooth trackers, hidden cameras, rogue cell towers and IMSI catchers, fake WiFi networks, drones and their pilots' location, smart glasses, license plate readers |
| Locating tools | AI sound locator, Paired Sweep (second phone or Wear OS watch), UWB ranging on supported phones, Vehicle Check mode |
| Evidence | PDF reports with a map, a SHA-256 fingerprint and a digital signature |
| Privacy | 100% on-device. No account, no servers, no data collection, no telemetry. |
| Patent | Patent pending, U.S. Patent Application No. 63/999,630 |
| Full feature list | sentryrf.com/features |
Copy-ready descriptions
Free to use as written.
SentryRF is an Android counter-surveillance app that finds Bluetooth trackers, hidden cameras and rogue cell towers using the phone's own sensors, entirely on-device.
SentryRF is a counter-surveillance app for Android that turns a phone's existing sensors into a detector for the hardware people are actually tracked with. It detects Bluetooth trackers, including unbranded models and devices that rotate their MAC address to stay hidden; finds hidden cameras by spotting their infrared LEDs through the front camera; and flags rogue cell towers and IMSI catchers. It also identifies drones by make and model and shows where their pilots are. When something is found, a sound-guided locator, multi-device Paired Sweep and UWB ranging help users physically locate it. All analysis runs on the phone: there is no account, no server and no data collection. Its detection technology is patent pending.
Logos and images
Tap to open full size. Free to use in coverage of SentryRF.
