There are a number of tools that can help you to obtain more information about an app. You can use a command line to view the contents of a file, and when it is compiled, there's still a fair amount of information that can be derived from an iOS application file (an IPA file). To do this, simply use the cat command for a file from your app library:
Cat /Users/charlesedge/Music/iTunes/iTunes\ Media/Mobile\ Applications/
Amex\ 4.6.0.ipa
You can also view data in the file without all the special characters using the strings command:
Strings /Users/charlesedge/Music/iTunes/iTunes\ Media/Mobile\
Applications/Amex\ 4.6.0.ipa
There are also disassemblers that have different levels of luck in obtaining information about a file. For example, Hopper Disassembler that can be purchased from the Mac App Store at https://itunes.apple.com/us/app/hopper-disassembler/id422856039?mt=12. The following screenshot shows the Hopper Disassembler:
Hopper Disassembler