On Android you can check which applications want access to microphone since 5.0 or 5.1 and the capability-based design during runtime works since 6.0. On macOS, it also works, and there's Micro Snitch which notifies the user when the microphone is active. Its from the same makers as Little Snitch. Its pretty basic; e.g. if you use Siri the log won't really tell much about which applications did use it.
3 comments, 3 days ago, 19 points.