Best Debt Payoff Apps and Calculators

If you've got multiple debts — a credit card at 24% APR, a car loan, maybe a personal loan — the math of figuring out the optimal payoff order and timeline gets genuinely complicated. You can do it with a spreadsheet if you want, but most people won't. That's the honest reason debt payoff apps exist: they lower the activation energy required to do the math and stick to a plan.

The core problem these apps solve is the optimization question. Which debt do you attack first? How does an extra $200/month accelerate your payoff date? What's the total interest cost if you do this versus that? Getting those answers from a spreadsheet requires either decent Excel skills or finding a template online, neither of which most people bother with.

Two payoff strategies dominate the field:

**Debt avalanche**: Attack the highest-interest debt first, pay minimums on everything else. Mathematically optimal — minimizes total interest paid. The downside is psychological: your highest-interest debt might also be your largest balance, so it can take a long time to get the first win.

**Debt snowball**: Attack the smallest balance first, pay minimums on everything else. More expensive mathematically (you pay more total interest), but the quick wins build momentum. Backed by behavioral research — people who use snowball are more likely to stay on track.

Most debt apps support both. A few have fancy hybrids. The right strategy is the one you'll actually execute, which usually depends on your temperament and how much you need psychological momentum to stay motivated.

Quick note before the reviews: Tally, which was one of the most widely recommended debt payoff apps for years, shut down in August 2024. They raised $172 million from investors including a16z and still ran out of cash — couldn't raise more capital in a tighter funding environment. It's gone. Any article still recommending Tally is either outdated or hasn't been updated.

Undebt.it is the one serious debt nerds use. It doesn't have the slickest UI and it's not trying to be your banking app — it's just an extremely powerful debt payoff calculator with more configuration options than most people will ever need.

Free version: solid. You can enter unlimited debts manually, choose from multiple payoff strategies, set extra monthly payment amounts, and see a full payoff timeline with month-by-month projections. The interface is web-based and slightly utilitarian, but the calculations are accurate and the output is detailed.

Paid version (Undebt.it Plus) runs $12/year. Not $12/month — $12 per year, which is one of the better deals in personal finance software. The premium adds integration with YNAB (if you're already a YNAB user, this is huge — your budget and debt plan talk to each other), debt payoff strategies beyond the core snowball and avalanche, a payment history tracker, and a savings goal feature.

Strategies supported: debt snowball, debt avalanche, debt avalanche with interest rate twists, highest balance first, lowest balance first, highest monthly payment first, and a custom order where you drag and drop your debts into whatever sequence you want. Nine strategies total. For most people, snowball or avalanche is all you need, but having options is useful if your situation is unusual.

What it doesn't do: it doesn't link to your actual bank accounts or credit cards. Everything is manual entry. For some people that's a feature — you're not giving another app access to your financial accounts, and the manual entry makes you actively think about each debt. For others it's a friction point that leads to abandonment. Know yourself.

Best for: people with multiple debts who want precise math, don't need bank account linking, and want maximum strategy flexibility. Also great for anyone who's already on YNAB and wants the integration.

Qoins is a completely different philosophy from Undebt.it. Rather than planning and optimizing your payoff order, Qoins automates small extra payments by rounding up your purchases and sweeping the change toward debt.

Here's how it works: you link your bank account, Qoins tracks your spending, and at the end of each month it takes the accumulated round-up amounts and sends them directly to a debt of your choice. Spend $4.27 on coffee? The 73 cents gets set aside. Spend $12.50 on lunch? 50 cents. Add it up across a month of normal spending and you're automatically making small extra principal payments you barely notice.

Cost: $2.99/month fee, deducted from your accumulated round-ups before the payment goes out. At higher spending levels, this fee is a tiny percentage of what you're sending toward debt. At lower spending levels, it starts to matter more.

Qoins also offers a few other features: a round-up multiplier (double or triple the round-ups), smart savings triggers (set aside money when you come in under budget on a category), and direct deposit splitting (send a fixed amount from each paycheck directly to debt payment). The core use case is behavior change through automation — making tiny extra payments effortlessly.

The limitation is scale. If you're spending $2,000/month on linked cards, your average round-up might be around $30-50/month in extra debt payments. That's helpful but not transformative. Qoins works best as a supplement to a larger debt strategy, not as the primary tool. Think of it as automatically finding hidden extra money rather than as a payoff optimizer.

Bank account linking security note: Qoins uses Plaid for bank connections, which is the same standard infrastructure used by Venmo, Robinhood, and hundreds of other fintech apps. It's the industry standard for account linking, though some people are uncomfortable with third-party data access regardless.

Best for: people who want to do something extra without thinking about it much. Good supplementary tool. Not a replacement for a structured payoff plan.

Debt Payoff Planner (that's the actual name, available on iOS and Android) is probably the best pure mobile experience in this category. If you want something you can set up in ten minutes on your phone and actually look at it regularly, this is it.

Free version is functional: enter your debts, choose snowball or avalanche, set your monthly extra payment, and see a clean visualization of your payoff timeline. The payoff calendar view showing exactly which month each debt gets eliminated is genuinely motivating — more so than a spreadsheet ever feels.

Paid version is around $2.99/month or $14.99/year. Adds a few extra strategies, more detailed projections, a payment history tracker, and the ability to model different scenarios side-by-side. The side-by-side comparison of snowball vs avalanche showing both total interest and payoff date is particularly useful if you're trying to decide which strategy fits better.

It doesn't do bank linking, similar to Undebt.it. Manual entry. You log payments as you make them, which adds a behavioral accountability element — you have to consciously record progress.

The interface is clean enough that you'll actually open it once a week, which sounds minor but isn't. One of the biggest failure modes of debt payoff tools is abandonment. Debt Payoff Planner's mobile-native design reduces that friction significantly compared to a web-based calculator you have to remember to visit.

One thing I like about it: the debt-free date countdown. Seeing "debt-free in 847 days" (or whatever your number is) is weirdly motivating in a way that spreadsheet numbers aren't. It turns abstract math into a specific target.

Best for: mobile users who want a clean, simple tracker they'll actually use consistently. Great starting point for anyone who finds Undebt.it's feature density overwhelming.

YNAB (You Need A Budget) isn't primarily a debt payoff app — it's a full zero-based budgeting system — but it deserves mention here because a lot of people find that dedicated debt apps fail because they're not connected to their actual budget. YNAB solves that by integrating debt payoff into your broader spending plan.

The logic: you can't successfully accelerate debt payoff without knowing where your money is going and finding extra dollars to throw at debt each month. YNAB forces that discipline. Once you're zero-based budgeting, you can create a specific budget category for debt payoff and actually fund it every month.

YNAB's loan tracking feature gives you a visual debt paydown tracker within the app, though it's not as sophisticated as Undebt.it for pure optimization. The Undebt.it + YNAB integration (available with Undebt.it Plus) bridges this gap — YNAB handles the budget side, Undebt.it handles the payoff optimization, and they talk to each other.

Cost: YNAB is $15/month or $99/year, which is the most expensive option in this category. It's hard to justify unless you're going to use the full budgeting system. But plenty of YNAB users report it as the single thing that actually changed their financial behavior after years of trying other approaches, so the ROI argument can be real.

Free trial is 34 days. Worth trying if you've tried other approaches and kept abandoning them — sometimes the problem is that the tool doesn't connect to your actual spending behavior.

Not everything needs a subscription. A lot of people genuinely don't need an app — they need to run the numbers once, understand their situation, and then execute on a plan they've built themselves. For that use case, free calculators are better.

Bankrate's debt payoff calculator is solid. You enter each debt, choose snowball or avalanche, and it shows you the payoff timeline and total interest for both strategies side by side. No account required. Completely free. Good for a one-time analysis.

CNNMoney's calculator is similar. MagnifyMoney has a good one too. These aren't ongoing tracking tools but they're perfectly good for answering "should I do snowball or avalanche and when will I be debt-free?" without downloading anything.

For the truly spreadsheet-inclined, Vertex42 has free Excel debt payoff templates that are more customizable than any app. If you already live in spreadsheets, this might be genuinely more powerful than any of the dedicated apps.

The case for calculator-only: you run the numbers, understand the math, set up automatic minimum payments on everything plus a large manual payment on your target debt, and you're done. The app just tracks what you already know. Some people find that app-free approach liberating — one less thing to maintain, one less subscription, one less app draining your mental bandwidth.

The case against: without tracking and accountability, a lot of people drift. The extra manual payment you were going to make on your credit card becomes an extra restaurant meal. The app isn't magic, but the friction of logging payments and seeing your progress does seem to help some people stay on track.

Overthinking which app to use is a procrastination technique disguised as research. I'll make it simple.

If you want free and powerful, use Undebt.it. Web-based, no account linking required, nine payoff strategies, and $12/year for the premium if you want it later.

If you want simple and mobile, use Debt Payoff Planner. Download it in two minutes, enter your debts, pick snowball or avalanche, and you're tracking.

If you want automated micro-payments with zero thinking, add Qoins as a supplement to either of the above.

If you need the full budget picture connected to your debt plan, consider YNAB — but only if you'll actually use it as a budget, not just a debt tracker.

If you're a one-time calculator type, Bankrate's free calculator is all you need.

The apps don't pay your debt. You do. The app is just a way to make the math clear and the progress visible. Any of these tools works if you actually use it. Pick one, enter your debts tonight, and look at that payoff date.

One practical starting tip that has nothing to do with app features: before you pick your payoff strategy, list all your debts with interest rates, balances, and minimum payments. Then total up your minimum payments. The amount you have above that total is your "extra" money for debt payoff. That number — whatever it is, even if it's only $50 or $100/month — is what the apps are optimizing. Knowing that number makes the tool more useful.