@gentooP on linux i use one of the software EBU128 meters to check the microphones :neocat_woozy:

though in editing i think audacity and others you can just do select-all and then tell it normalize to -18 LUFS.

sometimes i run a plugin that forcibly volume corrects all sound to that, but its annoying. if the person stops speaking for too long it will also pull up the volume to play the background noise or whatever.