The keep space app allows you to detect nearby devices using bluetooth, simply tap the radar to start a scan.

Any device that has bluetooth powered on will be detected if in range, this includes phones, smart watches, wireless headphones and fitness devices.

The distance you are alerted at is configurable and can be easily setup using a simple calibration process.

Devices that are always nearby can be ignored and custom sounds can be recorded and played when a device is within range.