OK, not brilliant
Not as good as the PC version, which allows for opk stimulus, quadrant (upper and lower left and right) for more specific parietal vs temporal stimulation. The moving target is hard to set - too small to touch as accurately as I'd like all the time, and only goes left and right from the same staring point rather than moveable to anywhere like the PC version. I would tend to only use this in clinic briefly to provide a left or right hem stim to test a hypothesis of effect but I would stop short at getting patients to get this app and use it at home. A good first version but needs much more features and customisability to be as clinically relevant as the original PC version, which I can put on a USB already customized to a patient and give them to use at home without them having to pay 10 bucks for it.