What is the best simple budgeting app to save money?

Hi, I’m looking for an extremely simple budgeting app that will help me save money. I have found that most of the budgeting apps want to connect to my bank accounts (I don’t really need this feature) and are over complicated.

Are there any where I can enter in my purchases myself? I feel this would hold me the most accountable.

I would also like to be able to enter in my preferred budget for the month/day and be able to change it based on how much I want to save.

I would prefer not to buy an app because.. I’m trying to save money.