Most budgeting apps work by connecting to your bank account so that they can track all of your spending. Many budgeting apps will allow you to connect all your financial accounts, including credit card accounts, so that you can see your complete cash flow in one place.
Mint makes money through strategic partnerships with other companies, which can help you save money. For instance, they offer a bill negotiation feature that notifies you if bill sharks can save you money.
The best budget app for beginners, You Need a Budget (YNAB), is paid budgeting app and offers many features that other apps do not. It's ad-free because it's a paid service, giving it a better user experience than other budgeting apps.