Paying for a budgeting app on a PhD stipend should feel wrong. Mostly, it is wrong. The subscription has to survive the very budget it is supposed to manage, and there is a special irony in paying monthly to organize money you barely have. So let us be practical instead of ideological.
Free tiers are genuinely enough for most grad students. EveryDollar's free version covers planning and categories. Goodbudget's free tier runs the envelope system. Several trackers let you log expenses manually for nothing. If your needs are a monthly plan plus expense tracking, free will carry you through the entire PhD. The best free grad school budget tracker app is the one you will actually open, and price has nothing to do with that.
Paid apps earn their keep in specific situations. Bank sync that actually works saves real time if your accounts are scattered everywhere. Shared household budgeting matters once money gets tangled with a partner's. And some people simply stick with a plan better when they have paid for the tool. That is psychology, not software, but it counts. I have seen it work.
The trap is paying for features that solve problems you do not have. Investment tracking, net worth dashboards, crypto portfolios. Lovely. Irrelevant. On a stipend, you need a plan and a tracker. Any decent grad school budget planner app, free or paid, does that core job, and most double as a grad student expense tracker app too.
My rule of thumb: start free, and upgrade only when you can name the specific thing the free version cannot do. Not a vibe. A thing. Sixty days of actually using a free planner beats a year of a paid app you opened twice. And if the budget never balances at any price point, the problem is the stipend, not the app. The cost-of-living-adjusted offer reports at phdstipend.fyi will tell you which programs pay enough for their city. Fix the income, then argue about the software.