Its's not blacklog,it's 'TBD' or Feature Requests [speaking technically,since you're a developer you can relate]
Let;s start by asking  a few questions,

1.Why you need the app ? There are 100 apps that almost do that same thing.The principle of programming,DRY [don't repeat yourself].

2.Completely understandable if you are doing it for learning purposes.

3.Is there a way to monitise your app ? I doubt it.