There are three ordinary ways to fund a personal-finance app, and it is worth being specific about what each one wants from you, because none of the three wants what you want.
This is not an accusation about the people who build them. It is a statement about incentives, which outlast intentions and do not need anybody to be a villain.
The three models, and what each one is rooting for
Subscription. You pay every month you are in debt. The revenue is a function of duration, so the best possible customer is one who owes money for years and remains hopeful about it throughout. Nobody at the company has to think this for it to be true of the spreadsheet.
Advertising. The advertisers in this category are lenders. You are the inventory, and you are worth the most at the moment you are most desperate — which is exactly the moment the app has the most influence over you.
Affiliate. The app is paid a fee when you take out the loan or open the card it recommended. Every recommendation is now also a commission, and there is no way to tell from the outside which ones would have been made anyway.
The fourth option is to be paid and then stop
One payment of $39 — a debt tool should not become a bill. The revenue arrives on the day of purchase, which means that from the following morning the company has no financial stake in how long you stay in debt, what you borrow, or whether you open the app again.
That is the entire business model, and stating it plainly is most of the point. If we are wrong about the product, we have taken thirty-nine dollars once from someone who did not need to keep paying to find that out. Thirty days, money back, no reasons asked.
What the constraint bought
It ruled things out, which is the useful part. No ads, obviously. No lender referrals and no refinance affiliates, so nothing in the product has a commercial reason to point you at a loan — which is why our own piece on consolidation is free to tell you when not to borrow.
No bank connection either. Aggregation is expensive to run, which is a cost that has to be recovered monthly, which is a subscription arriving by the back door. Type the balances in, or hand it a statement, and the figures stay on your device. It is a smaller product and a very much smaller liability.
And no credit-score upsell: no soft pulls, no score simulator, no sponsored health check. Those exist because scores are a fine surface to sell financial products against, and we are not selling any.
What it actually does
Enter the balances, the rates and the minimums once. It builds the order — avalanche by default, snowball a tap away — and returns the month your final payment falls in, along with what the plan costs in interest and what one extra fifty a month takes off the end.
Then it tracks it. Log payments and the date stays true rather than aspirational: above the minimum and it pulls in, missed and it moves out, said plainly and without a lecture. A new balance on a cleared card moves the date too, and nothing in the app treats that as a moral event.
Where it stands
Not yet released. The register is open, and we write once — on the day it ships. The calculator already runs the arithmetic free in your browser, and how it works is the method in four steps.
Educational, not financial advice.