Which is the best currency converter app for iOS? And why?

I'm one of the developer of Valuta EX (https://www.producthunt.com/post...) and I would like to know what do you search for in a currency converter app. Why would you prefer an app instead of googling? And how would you chose among two currency converter apps? Have you some apps do you like most? Why?
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Aleksandra@aleks_muse · Product marketing
@federico_badini I use converters pretty often as I travel a lot. Googling on mobile is not as handy as a standalone app 9maybe just because I like to have an app for everything 😀). Most converter apps are pretty similar, so it is hard to name one fav. The action itself is pretty basic, so it is hard to outstand. Though I was thinking of something close to what Chronos app is doing for time converting. Though would be relevant for those travelers mostly, I guess. And checked Valuta EX now, looks pretty good, I would use it.
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