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A developer created a single-file HTML Progressive Web App to teach their children about investing and compound interest. The app, called D-investments, runs on an old smartphone mounted on the fridge and displays daily investment growth with configurable interest rates. It demonstrates how simple web technologies can solve real-world problems, turning financial education into an interactive, visual experience for kids.

I Built an App to Encourage My Kids to Invest — Just One HTML File

I love the idea, but ngl: the UI looks like something made by AI

That is a great idea!
Suggestion: Try to add a graph the see the earning in a curve. It will be cool to see how the balance goes up with time.