MIDI Scope

Byte By Byte

About this app

This app is primarily intended for app developers and OEMs to test MIDI.

It displays MIDI messages as hex bytes and by name. It also displays timestamps.
The app provides a MidiDeviceService that other apps can write to.

Ratings and reviews

This app confirmed my Yamaha keyboard was sending MIDI via OTG host cable to my pixel phone. This helped me prove my other app was not working correctly. Nice took to have. thanks.

This is the best tool for the job. So simple and easy to use. A useful window into the workings of my midi setup. It's now very easy to diagnose any issues I experience with just a quick look at the midi messages. I use it most to check my controler cc messages are assigned to the correct values and channels.

This application helped me diagnose what appeared to be a problem with my new irig midi 2 device as it had a permanently flashing midi in light when connecting either of my aging keyboards to my smartphone or ipad. Suspecting that a message probably was being persistently sent I searched for a midi message logger and after a couple of duff apps, I came across this one. Within seconds I discovered the Active Sensing message is the culprit due to the early implementation of the midi spec!