One of the best free percent calculator apps in the App Store, according to customer rating on iTunes, is Percentage Calculators, an app developed by IBEE Software Solutions. The customers list user friendliness and accuracy as pros. The downside of Percentage Calculators is the use of iAds.
The Percentage Calculators app provides an option to calculate percentage values, discounts and tips and set various currencies. As of version 2.2., the app is available for free, while those who used the previous versions have the option to obtain the latest one by contacting the IBEE Software Solutions support service. The app is available in English, and it takes about 10 megabytes of drive space.