The three noises in the free version are good, however there are two major issues with this app. 1-- The time maxes out at 2 hours and 55 minutes and I use this to help my babies sleep, would love to have at least a 4 hour window. 2-- The app has to be open and the phone on in order for the sound to work which drains the battery very quickly. I would love to "lock" the phone and still hear the noise.