Startup, sleep, wake, the disk you just plugged in. Mac Sound FX fills those moments with a sound you picked — not one Apple did.
macOS fires two separate events when you close the lid. Most apps play both. Mac Sound FX knows they are one moment to you, and plays one sound.
A two-partition USB fires two mount events 99 ms apart. A closing lid fires sleep and lock. Both are collapsed before anything plays. Try the switches — and click a row to hear it.
Choose a moment and the library opens filtered for it. 1,765 sounds in 35 categories, plus your own files. One click assigns and plays, so you decide by ear. The categories above are live — try them.
Drag the handles, hear the selection, save. The trimmed version can replace the original or sit beside it.
The waveform is read from the file itself and normalised, so quiet recordings still show their shape. Export is AAC, playable on every macOS version the app supports.
A Mac makes the same four sounds as every other Mac.
macOS will not let an app overwrite its built-in audio — the system volume is sealed and the boot chime lives in firmware. So Mac Sound FX does not fight it. It listens for the moment, and plays yours instead.
No subscription, no account, no tracking.
After checkout you get the .dmg straight away — no account needed.
macOS 13 Ventura or later · Apple Silicon and Intel