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Help & Instructions
What is this?
LUFS Compare is a professional tool for comparing two audio files with sample-accurate synchronization and loudness matching. ITU-R BS.1770-4 LUFS calculation with K-weighting, multi-channel support, and gating
This app is running locally. Nothing is being uploaded anywhere.
Support this App
If you find LUFS Compare useful, please consider donating.
How to use
Import files: Drop tracks into the dropzones or click "Import" to load your audio files (WAV, AIFF, MP3, AAC, FLAC)Match LUFS: Click "Match LUFS" to automatically adjust Track B's volume to match Track A's loudnessA/B Compare: Use the A/B switch to toggle between tracks while playingFine-tune: Adjust sample offset to align tracks perfectly, or manually adjust volume in dBSeek: Click anywhere on the waveforms to jump to that position
Presets
Save and load your track combinations with all settings (volume adjustment, sample offset, file paths).
Save Preset: Enter a name when prompted to save current settingsLoad Preset: Select from the dropdown to restore saved settingsDelete Preset: Click the "×" button next to a selected preset to remove it
Note: Audio output device and channel settings are NOT saved in presets - they remain global.
Audio Output
Select your audio interface and route to specific output channels.
Output Device: Choose which audio interface to use (System Default or any connected device)Left Channel: Select which physical output for the left channel (1-8)Right Channel: Select which physical output for the right channel (1-8)
Use cases:
Route to specific monitors in multi-speaker setups
Send to external hardware for monitoring
Compare through different output chains
Keyboard Shortcuts
Space: Play / PauseLeft Arrow: Switch to Track ARight Arrow: Switch to Track BW: Toggle between A/BM: Match LUFS buttonEnter: Stop and rewind
Limits
Volume Adjustment: -90dB to +6dBSample Offset: ±10 seconds
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