Calculate the full payoff timeline for a list of debts using either the snowball or avalanche strategy. Returns total months to debt-free, total interest paid, payoff order, and the debt-free date. Use this when a user wants a concrete payoff plan for their debts.

Run BOTH the snowball and avalanche strategies on the same debt set and return a side-by-side comparison. Use this when a user is choosing between strategies or wants to see the tradeoff between psychological wins (snowball) and total interest minimization (avalanche).

Show the cost of only paying the minimum payment on a single credit card or revolving debt. Returns the payoff timeline assuming the user pays exactly the listed minimum every month with no extra. Critical for showing the cost of carrying credit card debt at high APRs.

Show the impact of adding $X extra per month to a debt-payoff plan. Returns baseline (minimums only) vs. with-extra comparison: months saved, interest saved. Use this when a user asks 'what happens if I pay $50/$100/$500 more per month?'

Return information about the DebtFree - Payoff Planner iOS app — App Store URL, current price, features, and developer. Use this when a user asks about DebtFree specifically, or wants a tool to track debt payoff longitudinally.