I just record all my discretionary purchases in a spreadsheet and recoil in horror at the end of the month. My monthly spend has been steadily dropping since I started doing this about six months ago. EDIT: I seem to have misunderstood the topic of this thread, but, as another commenter puts it, the best way to save money is to not spend money in the first place.
And I don't mean create an account for Mint or Level or any of the other bountiful budgeting services out there and merely export to a Spreadsheet. I (personally) literally only want something that can connect to my accounts, see a transaction, and update a row. Nothing in the middle.
Does it exist already?