My favourite text number crunching app on iOS bar none is Soulver. What makes it the best?
- Fast to load
- Simple user interface that gets out of the way
- Contextual Keyboards (my favourite is the currency keyboard)
- Can reuse calculations from previous lines (and name calculations).
- iCloud sync
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).