MIDI Loupe
MIDI Loupe is a macOS utility for monitoring and logging MIDI messages from multiple MIDI devices in one place.
What is MIDI Loupe?
MIDI Loupe is a Mac utility for watching and recording MIDI data from multiple MIDI devices at the same time. It helps musicians, MIDI users, and developers inspect incoming messages, compare activity from different sources, and review what a device or controller is sending. Each registered MIDI source is shown with its own color, which makes it easier to distinguish message streams during testing or troubleshooting. The app can save captured logs to disk and load them again later for inspection, which is useful when diagnosing hardware behavior, validating MIDI routing, or documenting results. MIDI Loupe is published by gfApps and is offered as a focused helper tool rather than a full music production environment.
Key features
- Monitor MIDI messages from multiple MIDI devices simultaneously
- View each registered MIDI source with separate color coding
- Select which MIDI sources to watch from the device list
- Log incoming MIDI data for testing and troubleshooting
- Save recorded MIDI logs to disk
- Load saved logs later for review and comparison
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Mostly safe
MIDI Loupe is a purpose-built MIDI monitoring tool, so access to MIDI devices is consistent with what the app is designed to do. That kind of access can expose performance or device data shown in MIDI streams, but it is not the same as broad system control. If you use the app, install it from the publisher's site or the Mac App Store and confirm the bundle ID is com.gfApps.Midi-Loupe before granting device access.
Recommendation: Keep MIDI Loupe if you monitor, troubleshoot, or test MIDI hardware and software on your Mac. If you no longer work with MIDI devices, you can remove it without affecting general macOS use, though saved logs may be useful to back up first.
Common paths
/Applications/MIDI Loupe.app
Preference paths
~/Library/Preferences/com.gfApps.Midi-Loupe.plist
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