Most budgeting apps are built (and priced) around people managing a mortgage, a car loan and three subscriptions they forgot about — which is a strange fit when your actual budget is rent, ramen, and whatever's left after the textbooks. Paying $5-10 a month for an app to track a few hundred dollars of monthly spending is a bit backwards; the subscription can end up being a meaningful chunk of the thing you're trying to manage.
An expense tracker for students works better as something free and quick — log a coffee or a bus fare in a few seconds between classes, not a big sit-down session. This one has no subscription and no bank login (so no waiting on a parent's account details or a card that isn't in your name yet), and it runs fine in a phone browser. Just try adding a week's worth of spending and see what surprises you.