CashCub is a simple ledger for tracking a kid's allowance: it doesn't connect to a real bank account, and no real money ever moves through it. A parent sets a weekly allowance that's automatically split into Spending, Saving, and Giving, and each kid can log in on their own to check their balances. Kids can also choose to put part of their savings into a simulated S&P 500 investment that tracks the real stock market, as a safe way to learn what investing feels like.
Part of a kid's Saving balance can be moved into Stocks - S&P 500 right from their dashboard. Money there grows or shrinks along with the real S&P 500 index, calculated automatically — it can go down as well as up, just like real investing. Money can be moved back and forth between Guaranteed Return savings (a fixed interest rate set by the parent) and Stocks - S&P 500 any time.