A monthly limit per category, optionally tied to a goal, with the reason you set it.
Go to Finance and select the Budget tab.
Choose a category and set its monthly limit.
The “why” is what makes a budget survive a hard month — your companion quotes it back when you are deciding whether to break it.
A budget can point at a goal, so cutting one category visibly funds something you actually want.
Budget used is shown on the overview, and your companion will raise it if you are on track to overshoot with weeks still to go.
Open Set a budget by category in the app (sign-in required).