I've been relying on activity monitor to check my performance problems and what it relates to. I recently installed CleanMyMac and noticed that the memory reported by it is way different than the activity monitor:
Am I calculating the memory wrong? Or there is something I'm not accounting for? I expect to have 4.00 - 2.91 = 1.09 GB of free memory, instead CleanMyMac reports only 27.5 free memory. Is there anything I am not considering in Activity Monitor?