Strongly recommended for the ambitious user
Sky Safari 4 Pro is an extremely powerful astronomy app with lots and lots of useful and nice features.
Nevertheless, it is quite self-explanatory from the beginning and easy to use, even for non-professional stargazers like me. Even as a novice, I do not regret that I bought the pricey Pro Version of this app, this allows me to discover a lot of things on a very detailed level and to dig deeper and deeper. From my point of view it is quite astonishing what is hidden inside this application.
From the perspective of features and frontend design, this application is no doubt a 5-star candidate (at least!) and for sure one of the best - if not the best - iOS Planetarium. Only drawback is the fact that the app crashes quite often, especially in very resource-demanding situations using the - otherwise great - Orbit feature (iPhone 5s). If these hangups will be resolved in a future release, there will be nothing at all left to complain for me!
TheGeneralist about
SkySafari 4 Pro: Professional Telescope Astronomy! Explore Sun, Moon, Mars, Stars, Planets, and Satellites! Go where NASA space missions have not!, v4.0