This is the only santur playing/tuning app I've found, and it's really well done. I wish the user could switch from 12 bridges to 9 bridges, because 9 is much more common for the instrument in the real world (it's distracting to have to ignore the extra bottom strings and top string). However, it is VERY exciting to switch among all the tunings and experiment with them on a virtual instrument, and that alone is clearly worth the app's price.