Every App needs a couple of dozen graphic assets, icons, splash screens, etc.
An excellent overview of all that’s necessary for iOS and Android is “Icons and Splash Screens”
Do your eyes glaze over when you think of all the time you’re going to spend creating all those assets? Mine do. Particularly with icons you need practically the same symbol in many different size variations for iPhone, iPad and Android.
The good news is, instead of manually creating them all in Photoshop, Gimp or whatever, you can generate them all automatically from one graphic. This service is provided by the site MakeAppIcon. Just upload one graphical template in PNG, JPEG or PSD format (preferred dimensions 1024×1024), let the site do its thing and within a short time an email with a ZIP attachment containing all the icons in every size that you wanted, and some you didn’t know you wanted.
This saves a lot of time, money and frustration and gives you more time to do something fun, profitable, or both. Many thanks to the FileSquare people for making this available free to everybody.