What are some alternatives?
When comparing Starmap and SkyView, you can also consider the following products
Stellarium - Stellarium is a free open source planetarium for your computer.
Sky Map - Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the...
Solar System Scope - 3D model of the Solar System and night sky in real time
KStars - KStars is a Desktop Planetarium for KDE.
Gaia Sky - 3D visualization software for ESA's (European Space Agency) Gaia mission to chart about 1...
Star Chart - Stellarium is a planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free. Read more about Star Chart.