It's a common app for managing tag (category) based listings and also used to analyze each set's overall weightage.
Eg:- If I have multiple investment or debts I can define and track percentage of each holdings.
steps:-
1. create categories (eg:- movable assets , immovable assets ,etc).
2. create sets aka group (used to group lists) (eg:- finance, debts, etc).
3. open set and create list with value (eg:- house, gold, ect).
4. click analyze on footer to view percentage on each list and pie chart for overall lists.