What this is for
“Personal finance app” tells you nothing.
This one is narrow on purpose: it answers conditionals about a household’s cash position. Here are the situations it was built for, each with the mechanism that answers it and an honest statement of where it stops.
The money is there, the timing is not
Why am I short in the third week when the month works on paper?
Your income and obligations balance over a month but collide inside it. This is the problem the corridor was built for.
Anyone whose budget balances annually but who still hits the occasional overdraft.
You do not get paid the same amount every month
How do I plan when I do not know what is coming in?
Freelance, hourly, commission, seasonal. Tools that assume a salary are useless here, and that is most of them.
Contractors, freelancers, hourly workers, anyone on commission or tips.
How long could you actually last
If the income stopped tomorrow, how many months do I have?
Not the rule-of-thumb answer. The one computed from your actual obligations, on their actual dates.
Anyone weighing a layoff risk, a career change, a sabbatical, or starting something.
The bill that doubles every January
How much worse is winter going to be this year?
Utilities are scheduled like rent but priced like a commodity. Most tools treat them as one or the other, and both are wrong.
Anyone in a climate with a real heating or cooling season.
You have a view about the economy
If I am right about this, what does it do to me specifically?
Not whether the market goes up. Whether your life changes if it does.
Anyone who reads the news and wonders what it means for their own situation rather than in the abstract.
Why you should believe any of this
How do I know the forecast is not just confident nonsense?
Because it grades itself in public, and it has already failed twice in ways you can read about.
Anyone who has been burned by a tool that projected with more confidence than it had earned.
You want the ledger, not the verdict
Can I see why it decided what it decided, and can I leave?
Append-only storage, traceable categorization, full export on every tier including the free one.
People who have watched a finance product get acquired, shut down, or change its terms.