MIDI monitor applications display MIDI messages received by your Mac, PC, or tablet.  They are useful for troubleshooting MIDI configurations, to verify that your MIDI controller is sending the expected messages on the correct channel.

Mac OS



  • MIDI Wrench


These web-based MIDI monitors require WebMIDI, which is not supported by all browsers.  See webmidi.info for a list of browsers that support WebMIDI.