Payoff Lab
Your cards as they actually are go in; the month you are debt-free, and what avalanche saves over snowball, comes out.
Your complete payoff schedule and debt-free date, promo cliffs included.
$5 a month on its own, or in Statements ($9 a month or $79 a year); every paid tool for $24. It adds: PDF and CSV export of the full schedule, saved side-by-side scenarios, and promo-cliff reminders.
One subscription, one invoice — add a tool any time, prorated. Sign in and it unlocks; or paste your key once per device.
Email support@avyth.com and the person who built Payoff Lab reads it. If it fails on your file, say what the file looks like — that is usually enough to fix it.