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The true cost of a purchase is the price you paid plus all the interest that purchase has cost you while it sat on your card. If you bought a $500 TV in March and you're still carrying the balance in November, that TV has been quietly racking up interest the whole time — and your statement never breaks it out per purchase. Pay Down does. It uses your real statements, your real APR, and a day-by-day calculation to show you the actual dollar cost of every transaction on your card.

Your bank's app tells you your balance. Pay Down tells you why your balance is what it is. We allocate interest down to the individual purchase using FIFO (the same method federal law requires for payment application), so you can see that the $40 lunch from six months ago has become a $46 lunch — and that's information no bank gives you. We also build payoff plans, compare balance transfers, and run the math on minimum payments. Your bank doesn't want you to know what the minimum is really costing you.

No. Pay Down works entirely with CSV statements you download from your card issuer's website — Chase, American Express, Capital One, Discover, and Citi are all auto-detected, and any CSV with date/description/amount columns will import. If you'd rather have automatic transaction syncing, you can connect via Plaid; if you'd rather not, you never have to.

Balance transfer offers can save you thousands — or quietly cost you more than they save. The calculator takes the balance you'd transfer, your current APR, the promo APR, the post-promo APR, the transfer fee, and the promo length, and tells you: whether it nets out positive after fees; whether it's true 0% APR or deferred interest (deferred means if there's any balance left when the promo ends, you owe interest going all the way back to day one); what monthly payment you'd need to clear the balance before the promo ends; and what happens if you don't.

It shows you the number your card issuer doesn't want you to see. Enter a balance and an APR, and Pay Down tells you exactly how many years (and how many dollars in interest) you'll spend paying only the minimum. Then it lets you add an extra $20, $50, $200 a month and shows you what that small change buys — usually years off your timeline and thousands in saved interest.

Yes. Pay Down uses bank-grade encryption, biometric login, and optional two-factor authentication. We never sell your data, never share it with advertisers, and we don't store your bank credentials — those go to Plaid, which is the same provider used by Venmo, Robinhood, and most major budgeting apps. You can delete your account and everything we have on you at any time. See our Privacy Policy for the full breakdown.

Pay Down is free — you get unlimited cards, CSV import, all four calculators, payoff plans, progress tracking, and cross-card search at no cost. A Premium tier adds bank auto-sync via Plaid, the Insights tab (true cost multiplier, category and merchant breakdowns, and effective APR trends), monthly AI spending review, and card sharing with a partner.

It builds you a month-by-month roadmap to zero. The Plan tab now shows Avalanche (highest APR first) and Snowball (smallest balance first) side by side, so you can see each strategy's debt-free date, total interest, and which card pays off first before you commit. When the difference is meaningful — at least $25 in interest or at least one month — Pay Down flags it so it's easy to spot. If your balance is still growing because new purchases outpace payments, you'll see a warning instead. You can also pick reduce spending to cut recurring charges and redirect that money to debt. Lock in a strategy, get weekly check-ins, and when you finish, the app celebrates with you.

When you open a transaction in Pay Down, you'll see a timeline with one row per billing cycle the purchase has been on your card. Some rows show interest. Others show $0 with a small tag: Grace, 0% intro, or Credit balance. Those $0 rows are intentional, and the math is correct.

A grace period means you paid last month's statement in full, so this month's new purchases didn't accrue interest — yet. A 0% intro APR pauses the interest meter but not the debt clock. A credit balance month happens when your card was overpaid going in. In all three cases, no interest was charged, but the purchase was still being carried on the card.

Pay Down shows one headline number — billing cycles carried — instead of two competing numbers, because that's the honest answer to "how long have I had this?" The breakdown timeline shows you exactly which cycles cost money and which didn't, so nothing is hidden.

English, Spanish, and French. The app picks up your device language automatically; you can switch any time from Menu → Settings.

Download Pay Down from Google Play (iOS coming soon). Add a card — enter the name, last four digits, APR, and credit limit. Either connect via Plaid for automatic sync, or import a CSV statement from your bank's website. Open any transaction to see its true cost. Open the Plan tab to build your payoff roadmap. No subscription required to get started.

Pay Down is available now on Google Play — download it here. The iOS version is in development and we're not announcing an App Store date yet — we'd rather ship it right than ship it on a schedule. Join the list to be notified when iOS launches.