Bluetooth Finder is a free Android app developed by José Luis Costumero under the Utilities & Tools category. It allows users to locate their Bluetooth devices using the received signal strength indication (rssi). The closer the user gets to the device, the stronger the signal will be, making it easier to locate.

The app displays the devices in a list with their name, MAC id, and a graphical signal strength meter (S Meter), in units of decibels dBm. The signal strength can be updated on 1-10 second intervals, depending on the device. However, it is important to note that the app does not work with headsets and only works with Bluetooth devices that are not already paired.

This app comes highly recommended by Fitbit users, and there is also a Pro version available for purchase that includes additional features like one device selection and an ad-free experience. It is important to turn on Bluetooth in discovery mode to use the app properly. If the app does not work on your device, the developer encourages users to send an email with their device model and problem description instead of leaving a negative rating.