Converty aims to let you do conversions with the absolute minimum of taps and keypresses.
Here is what other apps do: 1) select currency to convert from, 2) select currency to convert to 3) enter value 4) press go.
Converty works like this 1) enter the value in the row for the currency of your choice
Converty immediately converts the value to all your preferred currencies.
Rates are updated online whenever you like.
For Units – Converty works much the same – except it does need an extra step for you to choose the kind of measurement.