The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Custom Calculator allows you to import images from your photo library to use as its background. After making your selection, Custom Calculator converts the selected image to grayscale and places it under its vibrantly colored buttons, making Custom Calculator a great looking tool thats fun and easy to use.