What's It Cost?  This app is designed for Americans traveling elsewhere, and for others traveling to the United States of America.  It performs a "double conversion" of unit and currency; for example, if gasoline is $3.80/gallon, what's that in €/liter?  What's It Cost? is  a successor to PricePer, which has been discontinued and removed from the App Store.

There are three important views in What's It Cost?  The first is the view on which the conversion takes place.  After the price field has been entered, the currency chosen, and the units chosen, tapping the down-arrow button will post the converted cost.  Tapping the curly-arrow button will reverse the conversion (for example, if gasoline is €1/liter, what's that in $/gallon?)

On the currency page, choose among about 60 currencies.  On this page you can also edit an individual currency exchange rate, or download new values for all exchange rates.

On the units page, you can choose the units which go with the U.S. dollar ($, USD).  There are units for length, area, mass or weight and volume. 

The app works for all models of iPhone and iPod Touch (and for the iPad emulating an iPhone); it behaves properly in both landscape and portrait orientation.  It works for iOS versions 6.x and 7.0.  Internet access is required for the "download new exchange rates" feature. 

About Exchange Rates.  The exchange rates in the app were current at the time the app was sent to the  App Store.  It might be a good idea to download all new exchange rates as soon as the app is installed, and then to download or edit exchange rates before or during a trip.  The exchange rates are obtained from a OpenExchangeRates.org; internet access is required to download new exchange rates, and therefore may incur a cost to the user.  As currencies are added or deleted, revisions to the app will be required.

At any time, a user of What's It Cost can obtain his or her own "app_id" from OpenExchangeRates.org.  This will relieve any limitation on downloading exchange rates from the OpenExchangeRate server.

Important:  Each user, that is, each purchaser of a new version of WhatsItCost, will have five free downloads of exchange rate information.  The app itself is limited to the number of downloads of exchange rate information all its users can have in one month.  When these limits are reached, the user will be notified and offered the opportunity to open their own account, and get their own "app_id" from OpenExchangeRates.org.  In most cases, the app_id will be free.  Neither the app (its developer or Franklin & Marshall College), nor Apple, nor other users of What's It Cost? will know or retain any one user's app_id; it will become part of only the user's copy of WhatsItCost.

What's It Cost? appeared in the App Store on June 2, 2014