macOS gives nearly every notification the same sound; TrillMark gives each app its own — a system sound, one of 24 bundled tones, or a clip trimmed from your own music — plus a colour that flashes as a labelled full-screen wash or edge band, so you know it’s Slack before you look. A menu-bar log counts recent alerts. $7.99 at launch, one-time for three Macs; Apple silicon, macOS 26.