The short answer
Pick the lightest tool that solves your problem.
If you run one agent and only need to know when it stops, a sound hook or terminal-notifier is enough, and every page below says so. Heard is for the next problem: several Claude Code or Codex sessions, and wanting to hear what changed and what needs you without going back to the screen.
Ready when your agents are
Hear the work without watching every screen.
Start with the full Heard Power experience for 14 days. No card required. The open source engine remains free.
Download Heard for Mac macOS 14 or later · Claude Code and Codex supported