MIDI Monitor
MIDI Monitor is a macOS utility for viewing incoming and outgoing MIDI messages so musicians and developers can troubleshoot devices, apps, and MIDI connections.
What is MIDI Monitor?
MIDI Monitor is a native macOS MIDI utility that shows MIDI signals going in and out of your Mac in real time. It helps musicians diagnose confusing MIDI routing or controller problems, and it also helps developers test MIDI drivers and music applications. You can watch events as they arrive, inspect detailed event data, filter what is shown, and save MIDI activity in documents for later review. The app also supports working with System Exclusive data and includes options for changing how timestamps, notes, controllers, and other values are displayed. MIDI Monitor is published by Kurt Revis and is designed for Mac-based music, studio, and MIDI-development workflows where seeing exactly what data is being sent or received is useful.
Key features
- Display incoming and outgoing MIDI messages in real time.
- Filter visible events to focus on selected MIDI sources and message types.
- Inspect detailed event data, including hexadecimal and ASCII views where available.
- Save MIDI activity in documents for later review.
- Work with System Exclusive messages and save SysEx event data to a file.
- Change how timestamps, note names, controller values, and program numbers are displayed.
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Safety overview
Status: Mostly safe
This app's behavior is consistent with its purpose as a MIDI troubleshooting tool. It may need access to MIDI devices and virtual MIDI connections so it can monitor message traffic, and its optional MIDI spying component matches that function. If you no longer use MIDI debugging tools, check for the MIDI Monitor.plugin driver in ~/Library/Audio/MIDI Drivers in addition to the app itself.
Recommendation: Keep MIDI Monitor if you use MIDI hardware, virtual MIDI routing, or music software troubleshooting on your Mac. If you do not work with MIDI anymore, you can remove it and its related helper files without affecting unrelated apps, though you may lose saved preferences and any convenience features tied to its MIDI monitoring plugin.
Common paths
/Applications/MIDI Monitor.app~/Applications/MIDI Monitor.app
Support paths
~/Library/Audio/MIDI Drivers/MIDI Monitor.plugin
Preference paths
~/Library/Preferences/com.snoize.MIDIMonitor.plist
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