Bluetooth MIDI Connect is a free Android app developed by ROCKRELAY that allows you to connect your keyboard or controller to the Android MIDI Service and use it with your favorite app that supports MIDI.

One of the benefits of using Bluetooth MIDI Connect is that it supports several devices, including YAMAHA MD-BT01, YAMAHA UD-BT01, AKAI LPK25 WIRELESS, AKAI LPD8 WIRELESS, KORG microKEY Air, and HiFing (Kaixinlian) MIDI Adapter (note on / note off midi messages only). Additionally, the app does not collect, send, or store your location, but it does require location permission to scan for Bluetooth devices near you.

Overall, Bluetooth MIDI Connect is a reliable and easy-to-use app that provides a seamless connection between your keyboard and your Android device. If you're looking to connect your keyboard to your Android device, this app is definitely worth checking out.