SigEye

An Android utility and experimentation app to learn about the wireless signals around you — Phyphox, but for Bluetooth and Wi-Fi.

Thirty-four experiments, from measuring how many dB a crisp packet blocks, to following one phone through the address changes designed to stop you. Everything runs on the phone. No network code, no accounts, no analytics, nothing leaves the device.

Experiments carry one of three states on the home screen: Active (27, run on real hardware and behaved), Beta (2, complete and tested but only on a build server), and In Development (5, described but not built).

Features

Tools — see and name what is around you

- Device Inspector: everything broadcasting around you, decoded. - Discovery: learn what is normally here, then watch for what is not. - Proximity Radar: everything around you, arranged by how close it sounds. - Signal Watch: alerts when something you care about comes into range. - Forensics: record everything, then work out afterwards what mattered. - Persistent Tracking: keep a device's name attached to it after it changes address.

Counting and sensing — who and what is moving past

- Train Spotter: counts new Bluetooth devices nearby and flags the bursts. - Speed Estimator: how fast was that, from the shape of the signal. - Crowd Counter: roughly how many people are around you. - Dwell Time: who is passing through, and who lives here. - RF Motion Detector: notices someone crossing a radio path. - Place Profiler: leave the phone somewhere for hours and see the shape of the place. - Daily Rhythm (soon).

RF physics — how radio actually behaves in your rooms

- Doppler Walk (beta): walk away counting your steps, and measure the number everything guesses. - Rotational Polarization: roll the phone over and watch the signal die. - Channel Congestion: who is using the 2.4 GHz band, and whether Bluetooth has room to shout. - Wall Penetration: measure how much more the building takes from 5 GHz than from 2.4. - Multipath Fading: stand still and watch the signal move anyway. - Body Absorption: turn slowly in a circle and find your own shadow. - Faraday Cage Test: how many dB does a tin, a fridge, or a crisp packet really block? - Microwave Interference: watch a microwave flatten the 2.4 GHz band. - True Ranging (Wi-Fi RTT) (soon). - Two-Phone Link Budget (soon).

What is being broadcast

- Defeating Randomization: follow one phone through its address changes. - Rotation Lab: a whole room's address privacy, grouped by maker. - Exposure Scan: insecure and over-sharing things in range. - Wi-Fi Survey: every network around you, and what its address gives away. - Bluetooth Explorer: ask a device what it has. - Beacon Decoder: reads the beacon formats hiding in the noise. - Traveling Companions: record here, there, and somewhere else. What appears in all of it? - Follow Me (beta): narrow a room down to the device travelling with somebody.

Mapping

- Cell Handovers: how often your phone changes tower. - Dead Zone Heatmap (soon). - Route Logger (soon).

Privacy

No network code, no accounts, no analytics. Nothing leaves the device.

Requirements

- Android 8.0 (API 26) or newer - Bluetooth and Wi-Fi hardware - Location permission is required by Android for scan results on all versions - Android 12+ uses BLUETOOTH_SCAN without the neverForLocation flag so the same code path works on API 26–30

Known limits

- Android throttles Wi-Fi scans hard by default. Developer options can turn that off, and the preflight check says when it is biting. - Aggressive OEM battery managers may kill a foreground service anyway. Exempt SigEye from battery optimisation if a long recording has gaps. - Original-equipment tyre pressure sensors transmit at 315/433 MHz, which no phone has a receiver for. That needs an SDR.

Interface language: English