What are some alternatives?
When comparing Sky Map of Constellations and NASA App, you can also consider the following products
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.
Rocket Watch - A new way to watch rocket launches live 🚀
Google Sky Map - Google Sky Map is a free hand-held planetarium that allows you to identify stars, planets and more.
Sky Map - Sky Map (formerly the Google Sky Map) turns your Android-powered mobile phone into a window on the...
Code NASA - 253 NASA open source software projects
Stellarium - Stellarium is a free open source planetarium for your computer.