A free program for Android, by Ramkaran Yadav.

ByajApp is an easy-to-use interest and profit calculation app, which is capable of performing extensive calculations with great accuracy and speed. It is also a very simple app, which is user-friendly and suitable for all types of users, regardless of their financial knowledge or experience. ByajApp is designed for Android smartphones and tablets, and it is supported in all modern Android devices. The app is available in multiple languages, and it has a friendly and intuitive user interface. ByajApp allows you to calculate simple and compound interest, interest rate, and many other things. It is a very helpful app for those who are interested in finance and investment.