A free app for iPhone, by Kazi Mohammad Ekram.

Hindi Dictionary is a free-to-download, offline, and easy-to-use dictionary app for iOS devices. This app will help you learn both Hindi and English, and it is useful for everyone, from beginners to advanced users. You can search for words in the dictionary by using the English or Hindi keyboards, and the results will appear in the respective languages. You’ll also be able to hear the pronunciation of the words so you can get a better idea of how to say it. The app is also fully functional offline so you don’t have to make use of an internet connection to use it.