MIDI Loupe
MIDI Loupe is a free macOS utility from gfApps for monitoring and logging MIDI messages from one or more MIDI devices.
What is MIDI Loupe?
MIDI Loupe is a Mac utility published by gfApps for inspecting MIDI data traffic. Its official product page describes it as a tool for monitoring and logging MIDI messages from multiple MIDI devices. The app lists registered MIDI sources and assigns each source a separate color so users can distinguish message streams during testing. Users can choose which devices to include in logging, then save captured logs to disk and reopen them later for inspection. This makes it useful for troubleshooting controllers, interfaces, synths, and other MIDI setups when messages are missing, duplicated, or unexpected. The publisher also notes support for macOS 11 Big Sur and Apple Silicon in the current listed version information. On a Mac, users typically encounter this app when debugging MIDI routing, validating device output, or checking what data a keyboard or controller is sending.
Key features
- Monitor MIDI messages from multiple MIDI devices
- Log incoming MIDI data for troubleshooting and testing
- Show each registered MIDI source with its own color
- Select or deselect individual devices for logging
- Save captured MIDI logs to disk
- Load saved logs for later inspection
- View MIDI activity when diagnosing routing or device issues
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Safety overview
Status: Safe
This is a legitimate MIDI utility from gfApps for Mac. It is intended to inspect MIDI message traffic and the developer states that the app does not collect data in its App Store privacy disclosure. The main risk is operational rather than security-related: saved logs may contain device activity details that are relevant in studio or testing workflows.
Recommendation: Keep it if you use MIDI hardware, troubleshoot music gear, or need to inspect message streams. Remove it if you no longer debug MIDI devices or do not use MIDI on this Mac.
Common paths
/Applications/MIDI Loupe.app
Preference paths
~/Library/Preferences/com.gfApps.Midi-Loupe.plist
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