With Micro Snitch (was NOYB) there’s no doubt whether an application records audio through your Mac’s built-in microphone or if the camera captures video. This ultra-light menu-bar application operates inconspicuously in the background. It monitors and reports any microphone and camera activity to help you figure out if someone’s spying on you.
Fair enough, you might see the camera’s indicator light, but what if you are away from your computer? And for the microphone, there is no activity indication at all, so you won’t notice if the microphone is turned on even if you’re sitting right in front of your Mac.
With Micro Snitch you always know whether some app is currently using your microphone and its logging facilities allow you to reveal any suspicious activities later on.
Note: Micro Snitch was tested with as many different Mac computers and audio/video devices as we could get our hands on. The limitations we found are documented in the "Compatibility" section of the Micro Snitch FAQ, but there may be other compatibility issues that are not yet known.
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