Expenses Manager doesn't require any Internet special permissions, making it safe.
It features a button to generate a spreadsheet file. If you aren't interested in that, you can deny the "Write and read external storage" special permission.
-Write your expenses.
-Group them by name.
-The total sum is in the top.
-Select specific values you want to sum up. If nothing is selected, the total sum will be displayed (by default).
-Read the instructions to have a better experience.
-Improve your positive expending habits.