By default, Tiller does not automatically categorize your transactions like Mint and other personal finance apps. We believe that manually categorizing transactions helps you build awareness around your spending so that you can be more in tune with your money.
However, we do realize that this process can be very tedious if you're dealing with many accounts and have a high volume of transactions added on a weekly basis. To solve that tedium we built AutoCat, a Google Sheets Add-on that allows you to quickly categorize transactions based on a personalized ruleset.
We do not yet have this feature for Excel.