Developer: Paolo Grifantini
Price: $0.99 Download on the App Store
Currency Converter, from dev Paolo Grifantini, is one of several similar apps in the App Store designed to convert dollars into dinars, drachmae, dirhams or some other denomination. It's the kind of thing you need in your pocket when you're trying to figure out whether you're better off buying that bottle of perfume in the duty-free shop or on the local economy. In my case, I just used it to see if my dollar stretched from Massachusetts to Mexico but it snapped somewhere over Oklahoma.
Currency Converter works as well as you might expect: Enter your base currency and amount and then choose the currency you would like to convert it into. There are 200-plus currencies, including some that are no longer used, such as the French Franc, and virtual currency, such as Second Life's Lindens. A single button tap at the upper left corner enables you to convert in either direction between currencies.
Currency Converter is a take off of Grifantini's desktop widget currency converter, which some Mac users may already be familiar with.
In addition to its easy-to-use calculator-like functionality, Currency Converter can be customized in several ways. You can edit and sort currencies by name and code (in ascending and descending order); vary the number of decimal points from 1 to 5 for currencies; and add or subtract exchange rate fees from your conversions.
Currency Converter automatically updates exchange rates from the Web at 3 to 24-hour intervals; you can also update rates manually. On a Wi-Fi network, updating takes but a few seconds.
This app's interface is slick and easy to use. You can skin the app in a variety of ways: choosing from plain white to glossy green background, three colors for the bottom menu bar and nine text colors.
If you travel frequently, you'll find Currency Converter indispensable. Some other paid apps that you should compare this one to are Concrete Software Currency Exchange Rates ($1.99) and Rocket Gnome CurCon-Currency Converter ($0.99). All three share common attributes.