not sure what app you are referring to but Im guessing it would be ok. wish a good free one would come around for the iphone . wouldnt pay for a phone app that is free on my computer tho. my main laptop i use is a mac (im an apple kind of guy) so there are very few that actually work on mac.
e-liquid calculator runs on mac tho and is awesome. you can add alot of flavors to it. Ive done 6 or 7 flavor combos and you can input them all. not sure what the max is but Ive never run into that problem as of yet anyways lol.