Four open-source detection tools we build, test and support ourselves. Each one tells you what it finds — and, just as plainly, what it cannot.
These are not resold rebadged imports. Each unit is built here from an open-source project we read first, sourced from parts we can name, bench-tested before it leaves, and handed over with the source code that runs on it. If a device cannot do something people assume it can, that limitation is printed on its page in plain words, not buried in a footnote.
Tells you when something nearby is behaving like a fake cell tower.
A pocket LTE hotspot reflashed with the EFF's Rayhunter firmware. It sits in your bag or on the dash and watches the signalling traffic between itself and the tower it is attached to. Green bar means that traffic looks normal. Red means it logged something worth a second look.
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6 documented limitations — listed in full on the device page
Full spec and limitationsWatches for the same phone or earbuds turning up behind you twice.
A Raspberry Pi with a monitor-mode Wi-Fi adapter and a touch screen, running the Chasing Your Tail NG tool on top of Kismet. It listens for the radio signatures of nearby devices and alerts when one it saw a while ago shows up again somewhere else. That repeat is the pattern that says you are being followed rather than passed.
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8 documented limitations — listed in full on the device page
Full spec and limitationsReads the digital licence plate that compliant drones are required to broadcast.
A small ESP32 receiver that listens for the Remote ID broadcast the FAA requires most drones to transmit, and puts what it hears on a map running on your own laptop or Raspberry Pi. It will show you the drone's claimed position and, usefully, where the drone says its operator is standing.
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8 documented limitations — listed in full on the device page
Full spec and limitationsA first-pass sweep for things in the room that are transmitting.
A handheld broadband RF power meter based on the open-source RFHunter design - an ESP32 reading an Analog Devices AD8317 logarithmic detector. It samples the room's normal RF level at power-on and then shows you where that level goes up. It is in development: we are building our own carrier board and a calibration jig before we will sell one.
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8 documented limitations — listed in full on the device page
Full spec and limitationsEvery device on this page runs software somebody else wrote and gave away, and we think you should know exactly which. Where that software is under the GPL — Rayhunter, Kismet, RFHunter — the licence says anyone who receives the compiled program is entitled to the source code it was built from, so the complete corresponding source for the exact version on your unit ships with the unit, plus a written offer to send it again on request for three years after the sale. We do not lock the hardware either: if you want to pull our firmware off and put your own on, it is your device and that is your right under the same licence. The permissively licensed parts carry their attribution notices with the unit as well. None of this is us being generous — it is the deal that let these tools exist in the first place, and it is the reason you can verify what your device is doing instead of taking our word for it.
Tell us what you are actually worried about. Half the time the honest answer is a different device, or none of them.