Undebt.it vs Debt Payoff Planner vs a Free Calculator: Which Actually Gets You to Zero?
Here is the short version: the tool matters far less than the order and the amount. Every debt payoff app on this page runs the same two strategies, avalanche and snowball, on the numbers you give it. What you are really choosing is how much friction, tracking, and cost you want around that math. This comparison covers Undebt.it, the Debt Payoff Planner app, YNAB, a plain spreadsheet, and our own free calculator, with an honest take on who each one fits.
If you are not sure yet which payoff order is right for you, start with our worked example in Avalanche vs Snowball. Every tool below assumes you have made that choice or will let you compare both.
What every payoff tool actually does
Strip the branding away and each of these products does four things: it stores your list of debts (balance, APR, minimum payment), it sorts them into a target order, it simulates the rolling payment month by month, and it shows you a debt-free date and total interest figure. That is the whole product. The differences are in convenience: reminders, charts, syncing across devices, and how the app handles extra one-off payments.
That is worth knowing because it protects you from a common trap: spending a week researching apps instead of making the first extra payment. The math engine is a commodity. Consistency is not.
The comparison at a glance
Prices are approximate as of mid 2026 and change often; always confirm on the vendor site.
| Tool | Cost | Signup required | Methods | Best for |
|---|---|---|---|---|
| Undebt.it | Free core, small yearly fee for premium | Yes (email) | Avalanche, snowball, custom orders | Data lovers who want deep reports |
| Debt Payoff Planner | Free tier, Pro subscription | Yes (app account) | Avalanche, snowball, custom | Phone-first users who want reminders |
| YNAB | Roughly $9 to $15 a month | Yes (bank sync optional) | Budgeting first, payoff second | People whose real problem is the budget |
| Spreadsheet | Free | No | Anything you can formula | People who enjoy building it |
| DebtPathfinder calculator | Free | No | Avalanche and snowball, side by side | Running the numbers in two minutes |
Undebt.it: the power tool
Undebt.it has been the reference point in this category for years, and for good reason. The free tier is unusually generous: unlimited debts, both classic orders plus custom sequencing, payment history, and payoff charts. Premium adds snowflake payments tied to your calendar, more report types, and a debt snowball widget, for a fee that has historically been closer to a sandwich than a subscription.
The cost is friction. It is a dense, form-heavy interface that expects you to maintain it. If you are the kind of person who updates a tracker every payday and enjoys watching lines bend, it is excellent. If you abandoned your last three tracking apps, be honest with yourself about which kind of person you are.
Debt Payoff Planner: the phone native
Debt Payoff Planner is the strongest of the mobile-first options. Setup is fast, the payoff plan is presented as a simple month-by-month checklist, and payment reminders actually help the consistency problem that kills most plans. The free tier covers the basics; Pro unlocks unlimited debts and extra strategies.
The trade-off is the usual app economy one: an account, a subscription prompt, and your debt data living on someone else’s server. None of that is sinister, but it is worth naming, because the entire value of the app is a simulation you can run anywhere.
YNAB: when the budget is the real problem
YNAB is not a debt app. It is a envelope-style budgeting system with a loyal following, and debt payoff falls out of it as a side effect: give every dollar a job, and the extra payment finds itself. If your debts grew because spending is untracked, YNAB attacks the cause rather than the symptom, and it may be worth its meaningful subscription price.
But if your budget is already stable and you just need an attack order, YNAB is the most expensive way on this page to learn what a free simulation tells you in two minutes. Money going to a subscription is money not going to the balance. On a $5,000 card at 22% APR, the difference is not academic: our piece on the minimum payment trap shows what every diverted dollar costs over time.
The spreadsheet: free, if your time is
Everything these apps do fits in a spreadsheet, and building one teaches you the mechanics better than any app. The catch is that a correct rolling simulation with interest accrual is fussy to get right, and a subtle formula error can quietly misstate your payoff date by months. If you build one, sanity-check its output against a known calculator at least once.
Two minutes, no account, nothing stored: run avalanche and snowball on your actual balances and see the date.
Open the free calculatorWhen a paid app earns its fee
- You have quit plans before. Reminders, streaks, and visible progress are behavioral tools, and behavior is where payoff plans die. A few dollars for consistency is a good trade.
- Your situation changes monthly. Variable income, frequent snowflake payments, or debts being added and settled: maintained state beats a one-off calculation.
- You want history. Apps that log every payment give you a record that is genuinely satisfying and occasionally useful in disputes.
When the free calculator is all you need
- You need the decision, not the diary. Which order, what date, how much interest: a simulation answers this once, and the answer does not change unless your numbers do.
- You do not want another account. Our calculator runs entirely in your browser. Nothing you type is sent or stored anywhere.
- You already have a system. If autopay handles minimums and a calendar note handles the extra payment, an app adds surface area, not value.
There is also a quiet privacy argument. A list of your debts with balances and rates is a fairly intimate document. The fewer servers it lives on, the better, and a local calculation puts that number at zero.
The bottom line
Pick Undebt.it if you want the deepest free tracker and will actually maintain it. Pick Debt Payoff Planner if reminders on your phone are what keep you honest. Pick YNAB only if the budget itself is broken. Build a spreadsheet if that sounds like fun rather than homework. And if what you need today is the payoff order, the date, and the interest total, run the free calculator and put the app-research week toward your first extra payment instead.
FAQ
Is Undebt.it really free?
The core is free: unlimited debts, avalanche and snowball ordering, and payoff charts. A premium tier adds extras for a small yearly fee. Pricing changes, so check the site before deciding.
Do debt payoff apps see my bank account?
Only if you link it. Undebt.it and most dedicated planners work from balances you type in. Budgeting apps like YNAB are built around bank syncing. A calculator that runs locally in your browser never sees your accounts at all.
What is the difference between a payoff app and a budgeting app?
A payoff app answers one question: in what order do I attack my debts and when will I be done. A budgeting app manages every dollar you spend. If debt is the main problem, the payoff tool is the sharper instrument; the budget helps you find the extra payment.
Do I need an app at all?
No. You need a list of debts, one target order, and a fixed monthly amount. Apps help with consistency and progress. Run the numbers once, write the order down, and any reminder system works. If negotiating a lower rate would change the math more than any app, start with our creditor negotiation scripts.