Kaddish Tutor teaches you to recite the Mourner's Kaddish prayer. The tutor highlights and pronounces each word clearly, so you can study on your own. You can pick various modes of playback to learn to enunciate the words correctly.
If it does not work on your phone model please email me directly at firstname.lastname@example.org, so I can fix it for you.
(In loving memory of my mother.)