Kanverter is a simple app for converting between English and Japanese large numbers. In the English, large numbers are counted in 3 digit groups (thousands, millions, billions...) while in Japanese and Chinese large numbers are counted in groups of 4 digits, starting at 10,000. This makes it difficult for people dealing with these large numbers to convert mentally.
This app is meant for people either learning Japanese as a second language, or people learning English coming from Japanese.
For further information on the need that this app aims to solve, view this wikipedia article on Japanese numbers.
https://en.wikipedia.org/wiki/Japanese_numerals.
This app should also be helpful to learners or speakers of Chinese.