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For iOS I've found the following to be superb:
Observer Pro - THE best tool for planning your view sessions
Scope Nights - weather forecasts aimed as astronomy
AstroAid - DSO planning, for judging FOV/EP choice (covers all M, IC, NGC and Caldwell objects - with images for each and every one)
Scope Help - basic calculations, but useful (e.g. as GPS, sidereal time) - free too
SkySafari Pro - excellent planetarium/star chart, especially when you want to know what to expect in a deep field
Stellarium - Useful for getting your 'eye in' on the sky before you go out
SkyQ - decent for ephemeris, and I often use it as a replacement for my hand control in driving my 8SE
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