This is a great app. I have had several failed lumbar spinal fusions and it is very uncomfortable for me to stand, even for relatively short periods. The discomfort is intensified by holding a book in front of me, e.g. a siddur. Using this app and my iPhone are a vast improvement over a dead tree siddur. The company who developed this app is great. They really pay attention to their customers.
GXVJRYB about Siddur Zmanim Luach Minyanim, v7.1