Luminos is great, better than Star Walk. However, for casual star gazers Star Walk is very intuitive and simple to use, and I would recommend Star Walk for those who like looking at the stars but don't care about the details. I have all of the astronomy apps, and all of the astronomy apps shine in certain areas. I almost wish they would combine the best features of each into one app. Red Shift and Sky Safari are amazing apps, and a little gem called Solar Walk is a wonderful app as well. Luminos is right there at the top, and is without question it is the best astronomy app for the price at $2.99, which is a steal!