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Keep notification chimes out of the recording

Per-app audio capture — sounds from other apps stay out

A message arrives mid-recording and its chime lands right on top of the sentence you needed. kilde can record one window with only that app's sound: the audio follows the app you capture, so notification chimes and everything else playing on your Mac stay out of the file — no muting discipline required, no virtual audio driver.

1. Pick the window. In the menu bar app, choose the window you want. From the CLI, name it: kilde rec --window "Keynote" demo.mov (a title or bundle-ID partial match). Window capture is what keeps the audio per-app: --display and --region record the whole screen, other apps' sounds included, and --exclude-app removes only the one app you name from a full-screen capture.
2. The audio follows the app. When a single window is captured, its audio is scoped to that app — a message ping, music from another app, or a calendar chime never reaches the file.
3. Stop safely. Ctrl+C or the stop button always finalizes the file.

The flip side, stated honestly: sounds the captured app itself plays are exactly what you asked for, so they do come in — if the meeting app plays its own join chime, that is in the take. Audio-only recordings (--no-video) capture system audio as a whole, and there the per-app scoping does not apply.

A chime you have kept out of the file can still flash across the picture. If the screen is being recorded and banners are visible, turn on a Focus mode before you start — macOS then holds banners and their sounds back for the duration. Sound-wise kilde already has you covered; this closes the visual half.

The built-in screen recorder captures the microphone only, and a whole-desktop capture takes every sound your Mac plays, chimes included. kilde sits on ScreenCaptureKit, macOS's native capture framework, which is what makes per-app audio possible at all — and it costs nothing: free, open source, MIT-licensed.