Sky Map is described as '(formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the night sky' and is a very popular Star Map in the education & reference category. There are more than 25 alternatives to Sky Map for a variety of platforms, including iPad, iPhone, Windows, Mac and Android Tablet. The best alternative is Stellarium, which is both free and Open Source. Other great apps like Sky Map are SkyView, Gaia Sky, KStars and Star Chart.
SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more. Simply point the camera to the sky, tap on what you see and discover neat things about these sky objects.
Almost everyone thinks SkyView is a great alternative to Sky Map.
SkyMap provides interactive sky maps for any time, viewpoint and location on Earth. It shows the different names, coordinates, magnitude, astronomical rise and set times plus additional information for over 110000 stars, messier objects, planets, sun and moon.