!! Repository archived because I no longer work for the company where I used the application as a helper tool.
Using Tkinter as a GUI. Sums all money and calculate the difference against reference value. It takes one backup value from a file and can save new value to that file - there is no database, just simple TXT files. Difference value is stored in separate file with actual date and time, and so its progress can be compared.
I'm thinking about refactoring the app, as it was my first practical attempt to write some usable application. It's used daily since then.