$0.00
in your jar today
A jar at home keeps your money in one place. A bank is like a giant jar that lots of people share. It keeps everyone's money safe, remembers how much belongs to each person, and gives it back when you ask.
Your jar in this app works the same way. The jar diary is like the list a real bank keeps: every coin in and every coin out.
Interest is extra money the bank adds to your jar, just for keeping your money there.
The bank doesn't just leave your money in a drawer. It lends money to other people, like a family buying a house or a baker buying a new oven.
People who borrow pay the bank back a little more than they borrowed. The bank shares part of that extra with savers like you. That share is your interest. The bank keeps the rest to pay its workers and keep the lights on.
Here's the clever part. When the bank pays you interest, it goes into your jar. Next time, the bank pays interest on your money and on the interest it already gave you. This is called compounding.
It works like a snowball rolling down a hill: the bigger it gets, the faster it grows.
| Year | In the jar at the start | Interest on your money | Interest on interest | In the jar at the end |
|---|
Look at the gold column. That money was earned by old interest. It starts tiny and keeps getting bigger every year.
Two jars start with the same money. One only earns interest on the money you put in. The other also earns interest on its interest. Slide to see who wins.