Pocket Yoga Builder has a good library of poses and allows adding your own. The program allows creating loops for repetitive sequences such as Sun Salutations and allows setting time to hold poses specified as number of breathes or seconds.
One distracting problem is not all poses has spoken names, such as Supine Pigeon, and a bell tone rings. I prefer to listen to instructions, wihout looking at my display during my practice, but th bell requires ckecking the screen to see the pose.
Another annoying issue occurs in a loop where all poses have bells, such as in a loop with Supine Pigeon left and right, where the program skips a bell and you get out of sequence. The solution is to add a Corpse Pose, which has a spoken name, to the loop.