we made separate small and quick apps for each purpose instead of one app that has all features that you may not need for your purpose. also you don't have to pay for the full price one big app with all features you don't even use.

it's 5.0 because there were previous versions for Mac OS 9 and earlier.

Bass Tuner especially needed to be a separate app in order to optimize it for the lower frequency. and it now supports 5- and 6-string bass guitars.