Never pay interest by mistake
We tell you the exact card to use today for the longest grace period — no guessing.
Stop giving the bank your money
Every purchase on the wrong card costs you interest you could avoid. Financix tells you the exact card to use today so you pay in one installment, almost two months later — without a single cent of interest.
Free forever · No credit card to sign up · Your data is safe
How it works
A purchase made right after your cutoff is billed on the next statement — buying you the longest possible time to pay, with zero interest. Financix finds that card for you, every day.
You buy $1,000 today on the right card. You pay it in one installment ~52 days later — keeping your cash almost two months longer. Interest charged: $0.
Days interest-free if you buy today — Financix highlights the best one.
Bank, brand, last 4 digits, cutoff and payment days.
Financix computes the interest-free period for each one.
We recommend the card to use today to pay later.
All in one app
We tell you the exact card to use today for the longest grace period — no guessing.
Smart reminders before your payment and cutoff dates. Dodge penalties for good.
No spreadsheets, no math. Open Financix and instantly see which card wins today.
Earn XP, keep daily streaks and unlock rewards while you optimize your money.
Encrypted passwords and CSRF protection — we never store full card numbers or CVV.
Spanish & English with automatic detection. No cost, no catch, no credit card.
Stay motivated
Level up from Rookie to Finance Guru, keep your streak alive and collect achievements as you optimize your spending.
Start free ↗Who is it for?
You have 2 or more cards and never know which one to use.
You've ever paid interest or a late fee because you forgot.
You want your finances in order — without the hassle.
FAQ
Yes, 100% free. No credit card to sign up, no trial that expires. Financix is funded by discreet advertising — that's it.
We never ask for or store your full card number, CVV or expiry date. We only keep the last 4 digits so you recognize your card. Passwords are encrypted.
It works with any credit card, from any bank. You enter your cutoff and payment days (they're on your statement) and Financix does the math.
No. We never connect to your bank or read your transactions. You're always in control of what you enter.
Financix doesn't lower your prices — it helps you avoid interest by using your card's own grace period, and dodge late fees with reminders.
Spanish and English, with automatic browser detection. Switch anytime.
Take control of your cards in 2 minutes. Free, no credit card, in your language.
Create my free account ↗Join in 2 minutes · Cancel anytime · We never store full card numbers