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Almost always a permission or a range problem rather than a fault. Check that Bluetooth is switched on in iOS Settings, and that the app has Bluetooth permission under Settings, then the app name. If both are fine, move to the room where the device you want was last used — Bluetooth range is only about 10 to 30 feet indoors, so a scan from the wrong room finds nothing.

Wait a full 30 to 60 seconds without moving. Devices that have been dormant for hours advertise themselves far less often to save battery, sometimes only once every couple of seconds, so a short glance at the list is not enough. If it still does not appear, the battery is likely flat — a powered-off device transmits nothing and cannot be detected.

Because it is inferred from signal strength rather than measured. Walls, furniture, metal and your own body all absorb the signal and make a device read further away than it is, and reflections can cause the reading to dip even as you get closer. Watch whether the trend rises or falls as you walk instead of reading the number itself.

A single phone antenna measures how strong a signal is, not the direction it came from, so no Bluetooth app can draw a reliable arrow. Direction finding needs ultra-wideband hardware at both ends, which is what Apple uses for AirTag precision finding. Walking a few paces and comparing readings supplies the direction instead.

No. A device with no power broadcasts nothing, so there is nothing for any app to detect. This is a limit of radio rather than a limitation of the app. If the battery is flat, use the last place the device was connected as a starting point and search that area systematically.

Playing audio needs a full Bluetooth connection, not just detection. Pair the device in iOS Settings first, then play something at volume. Some devices will not connect while they are already connected to another phone, tablet or laptop, and earbuds shut inside a closed charging case usually will not play at all.

Scanning is most reliable with the app open and the screen on, because iOS restricts background Bluetooth activity to preserve battery. For an active search, keep the app in the foreground while you walk around.

No. Scanning happens on your phone and the devices it detects are not transmitted to us or to anyone else. Saved devices are stored locally on the phone, and deleting the app deletes them. There is no account and no sign-in.