Koza is a Gujarati-English dictionary application for smartphones created by founders Ravi Vagadia and Amit Siddhpura. The app has over 400,000 downloads and provides translations for over 80,000 words. Koza differentiates itself by offering an extensive database, high performance on various device types, and usability offline without an Internet connection. User feedback indicates the app helps people learn languages faster by providing translations easily on their smartphones.