Snowball: Compound Growth

See your money snowball — start free.

Watch a few dollars a month turn into real money — Snowball makes compound interest finally click.

Describe your plan in plain English ("starting with $1,000 and adding $200 every month at 7% a year"), watch it grow on a beautiful chart, and see the exact moment your interest starts outearning what you put in. No jargon, no clutter, no ads.

WHAT YOU CAN DO • Build a scenario in plain English — tap any number to change it • Watch contributions vs. interest stack up on an interactive growth chart • Save scenarios and come back to them anytime — no need to re-enter numbers • See today's-money value with the inflation toggle • Sign in with Apple to keep saved scenarios across your devices (optional)

Snowball doesn't manage your money or connect to your bank — it's a calculator that makes the math of compounding visible, so saving feels like progress instead of a leap of faith.