The best alternatives to Privacy Indicator are MicCheck, Antistalker, and Mic Drop. If these 3 options don't work for you, we've listed a few more alternatives below.
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MicCheck makes you aware when your microphone is active in the background & saves you from an embarrassing situation! Now, you can talk trash behind people's back without worrying about a conference call you forgot to hang up on your Mac.
Antistalker is a free Android app that notifies you when other apps are using the camera or the microphone of your device. Compared to other similar apps, lets you know which application used your cam or mic and for how long.
Ever been in a video call and needed to turn off your microphone, but couldn’t find the mute button quickly enough? Mic Drop helps you mute (and then unmute!) your microphone with a keyboard shortcut or a menu bar control.
You can choose your own keyboard shortcut to mute/unmute, Automatically mute your microphone after no activity, Mute your microphone when your computer is back from hibernation, Stay muted even when you connect a new device, Listen to your voice.