The debt payoff app market has matured significantly. Several good options exist, each with a different philosophy and set of tradeoffs. Here's an honest comparison to help you find the one that actually fits how you think.
What a Good Debt App Must Do
Before reviewing specific apps, here's the minimum: it should calculate and display your debt-free date based on your current payments. It should update that date when you make extra payments or change your payment amount. It should support at least avalanche and snowball payoff strategies. It should show total interest savings. Without these basics, it's a glorified balance tracker, not a payoff tool.
DebtCrusher
Full-featured debt payoff platform with avalanche and snowball strategy support, AI Advisor for personalized recommendations, streak tracking, gamified payments, and accountability partner features. Includes a payoff date calculator that updates in real time. Pricing: free to start with Pro features at $7.99/month, $49/year, or $249 lifetime. Best for: people who want motivation features alongside the math, and who benefit from AI guidance.
Undebt.it
Web-based calculator focused on the math. Excellent strategy comparisons, snowball/avalanche/custom ordering, and amortization schedules. Free with a paid tier. Best for: people who primarily want the calculation and payoff timeline without app features.
YNAB (You Need a Budget)
Full budgeting software that includes debt payoff tracking. Expensive ($15/month) and primarily focused on budgeting rather than debt payoff specifically. Powerful but overkill for pure debt tracking. Best for: people who need comprehensive budgeting alongside debt payoff.
Tally
Automates credit card payments and offers a line of credit to consolidate high-rate cards. More financial product than tracking app. Best for: people with multiple high-rate cards who want automated payment management.
The Bottom Line
The best app is the one you'll use consistently. A mediocre app used daily beats a sophisticated one opened twice. Try two or three and commit to the one that fits your habits.