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My first suggestion is just try the free apps, they are after all free and you can always delete them. Many of the paid apps have a free lite version.
I'll assume you are looking for planetarium apps. My favourite is SkySafari3. intuitive app, easy to find objects, excellent descriptions and lots of images. The lite version is lite only having the Messier objects, the plus version is suitable for most covering the common catalogs, the pro version if you really need it or pick it up on sale as i did hasjust about everything you could think of.
Moon globe and Mars globe are good free apps showing the main features of the moon and mars strangely enough.
SoHo viewer for the latest images of the sun. Free from memory.
Astro weather gives you a 7timer panel.
NASA app, get the official one.
These are the main ones i use. I have a few other specific tools that get occasional use.
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