I have been a DaisyDisk user for a long time and it is an app that drives me crazy, but I fully understand that there are people who do not want to pay for an app that is not used every day, and that is why I bring this alternative.
DiskScanner performs a similar function by scanning the hard drive for our largest files., breaking everything down into a nice central graph to have better access to the data.
From my point of view it is an essential app if we do not have DaisyDisk, so it is taking time to enter the Mac App Store and get hold of it.