Passive signal intel

Sweep

A passive RF radar. A pocket-size ESP32 sensor listens to the 2.4 GHz band around it — Wi-Fi access points and Bluetooth advertisements every device already broadcasts — and this page classifies each one by its hardware vendor. No cameras, no microphones, no packet contents. Just what's on the air.

Devices on air

Wi-Fi

Bluetooth

Randomized

Nodes live

Demo sweep — example data. Flash the Sweep firmware to an ESP32 and it replaces this with a live feed.

Tap a blip to inspect a device. Closer to center = stronger signal.

Device	Vendor	RSSI	State
No devices match this filter.

What this can and can't see

Fixed hardware is the sweet spot. Routers, access points, and cameras broadcast a stable address, so Sweep spots and identifies them reliably.
Phones and watches can't be tracked. Modern devices randomize their address, so they show as personal (randomized) and deliberately can't be followed over time — that's a privacy feature of the phones, not a limitation we hide.
Distance, not direction. One antenna reads signal strength (how close), not bearing — the angle on the radar is just for legibility.
Priority flags mark surveillance, fleet, and ALPR vendors worth a second look — the same vendor intelligence behind our Flock module.

Want your own node? It's a ~$10–20 ESP32 — see the build guide and firmware in firmware/sweep-node/ of this repo.