Soulver App

My favourite text number crunching app on iOS bar none is Soulver. What makes it the best?

Soulver is great for when a spreadsheet is just to heavy. I use it a lot for it currency conversion, makes it easy to have multiple line items in different currencies (say GBP & USD) and get a total in one (EUR). Also for splitting the bills at a resturant, each line could be a food item (so if two desserts cost the same, you can see quickly and only add lines relevant for each participant).