What Clearsweep cannot find

This is the whole list, gathered from the same file the app reads when it prints the limits next to your result. None of these are things we have not got around to. They are limits of the sensors and the protocols, and they would be true of any app using them.

• A camera on a different network, including one on its own hidden Wi-Fi
• A camera on a mobile data connection, which never touches this network
• An analogue or wired camera, which is not a network device at all
• A camera that records to a memory card and never connects to anything
• Anything at all if this phone is not joined to the network being swept
• A tracker that is not advertising right now, including one still near its owner
• A GPS tracker that reports over mobile data and uses no Bluetooth
• A tracker whose battery is dead, which is still evidence but not a signal
• A tracker inside metal or heavy shielding
• A tracker that is not magnetically mounted, such as one wired into the car
• A tracker plugged into the car's diagnostic port
• Anything further away than roughly a hand's width from the phone
• Any camera that is not using infrared, which is most of them in daylight
• A camera whose infrared is off because the room is lit
• Anything, on phones whose camera filters infrared out; test yours with a TV remote first
• A lens behind glass, fabric, or a one-way mirror
• A lens pointed somewhere else
• Anything in a bright room, where the reflection does not stand out

What that adds up to

A camera that records to a memory card, plugged into a socket behind a mirror, using no network and no Bluetooth, is invisible to every check on this page. So is a tracker wired into a car's electrics. If your reason to worry is strong, a phone is a first pass and not an answer — a physical search of the sockets, smoke detectors and vents, or a professional sweep, is what comes next.

Per check