LockMic is a free, open-source menu bar app for Mac. Press Cmd+Shift+M and your mic is muted for the whole system, so Zoom, Teams, Meet and every browser hear nothing. A small HUD shows if you're muted. Press Cmd+Shift+R to record your mic and the call audio into one file on your Mac. No bot joins the call and recordings are never uploaded. It's tiny: about 0.1% CPU when idle. Works on macOS 14+.