When you have more than one debt, you have to decide where the extra money goes after the minimums are covered. The two most-tested strategies are Avalanche and Snowball.
Avalanche: highest APR first
Pay the minimum on every debt, then put every extra dollar against the debt with the highest interest rate. Once it is gone, roll its payment into the next-highest APR. Mathematically optimal: it pays the least interest over the life of the plan.
Snowball: smallest balance first
Pay the minimum on every debt, then put every extra dollar against the debt with the smallest balance. Once it is gone, roll its payment into the next smallest. Psychologically powerful: you knock out a whole debt in weeks or months, and that momentum keeps you paying.
Which one is right for you?
The honest answer is: the one you will actually stick with. Research by economists at Northwestern and Booth has shown that people who use Snowball are more likely to finish paying off their debt, even though Avalanche would have saved them more money. If you have failed past plans because of fatigue, Snowball is probably the better fit. If you are disciplined and motivated by math, Avalanche wins.
What Finvy does
Pick Avalanche, Snowball, or AI-Hybrid in Settings. The Forecast page lets you swap strategies and see months-to-debt-free and total interest update live, so you can compare them against your real balances and APRs before committing.