It allows you to track your finances in one place, so it is easy for me as an accountant or bookkeeper/accounting assistant myself with my own business of tracking all expenses across multiple clients at once! I also love that they support different currencies like US Dollars (USD), UK Pounds Sterling (£) & Euros Euro's €).
There are no other similar apps out there which does this - maybe because its not something everyone needs but if anyone did then definitely check them out!! Also some features could be improved by adding more fields such as Expenses Categories etc., however these can easily done yourself through Excel spreadsheets / Google Sheets when needed anyway :).