This is a very practical money converter based on actual exchange rates from the ECB. No unnecessary other items, easy two way calculation, and a nice, clear interface. In fact the best I found comparing many.

But... the license can not be validated. The nagscreen returns and returns o each and every move other than calculating, demanding to connect to the internet (while it is, the currencies are loaded meanwhile) and to restart. That gets irritating on the paid version, needs attention. The programmer does not react on the built in e-mail notifier, alas.
The programme loads the currency over and over again, instead of using just downloaded sets. Or so it seems... roaming costs money, that's why you want an app like this adds free.

For this bug and unclearness I must deduct a star each. But still, it is the best money converter..