Ison Assistant is an Android application developed by Ioan Călin Borcoman, available for free in the Education & Reference category. This app displays the eight psaltic music modes using the Macarie, the Ieromonah, Anton Pann, E. Konstantinou, linear, and tempered intervals.

The app provides a simple and easy-to-use interface where users can select the mode they want to see and listen to. Moreover, it offers the possibility of switching between different notation systems and intervals to provide a complete and accurate display of the modes. Overall, Ison Assistant is a useful tool for anyone interested in psaltic music modes, providing a comprehensive and user-friendly platform to learn and explore them.