Audio tools for your Mac
BlackBox: Audio Edition
Transform your files. Hear the difference.
Build a pipeline, listen before saving, and keep your originals intact.
Coming to the Mac App Store · Version 2026.1 · US$4.99 at launch
Convert your collection
Create MP3, WAV, FLAC, AAC/M4A and other formats supported by macOS. Run more than one Convert action to make multiple outputs from the same source.
Shape the sound
Normalize loudness, adjust volume, change speed with or without preserving pitch, trim silence or duration, and add fades.
Listen before saving
Switch between your original and processed preview. Set a listening range, loop it, and hear the changes before transforming the batch.
See your audio
Compare waveforms and loudness. Explore detected tempo, key, instrument activity and musical parts. Music analysis provides estimates that depend on the recording.
Make metadata consistent
Copy all tags, remove them, or choose what to keep. Apply fixed values to a batch and optionally embed artwork from a separate image file.
Repeat your workflow
Save profiles that remember your changes. Run them with Shortcuts, AppleScript or the command line. Save beside originals or choose a folder and preserve its structure.
Local processing. New files.
Your audio stays on your Mac. BlackBox writes new output files, leaves your originals intact, and gives existing filenames a unique name.
Compatibility: macOS 27 or later on Apple silicon. Format availability depends on the macOS audio codecs. Protected audio cannot be converted.