Units: Unit Converter is a free iPhone app developed by Andreas Maier. It falls under the category of Business & Productivity and offers a comprehensive unit conversion tool with a wide range of measurement units and currencies.

The app boasts a user-friendly interface, making it incredibly easy to navigate and use. The units of measurement are neatly organized and can be accessed with just a few taps. Whether you need to convert currencies, lengths, masses, volumes, speeds, areas, units of information, pressures, powers, times, or temperatures, this app has got you covered.

Some of the most commonly used units are included, such as the United States dollar, Euro, Japanese yen, Pound sterling for currencies, and mile, kilometer, meter, and inch for lengths. Additionally, you'll find kilogram, pound, ounce, and gram for masses, and liter, gallon, and other units for volumes.

Overall, Units: Unit Converter is a reliable and efficient tool for all your unit conversion needs. With its extensive range of units and currencies, along with its intuitive interface, this app is a must-have for anyone who frequently deals with conversions.