I wouldn’t want kids to grow up chasing a number. It’s just too reductionist. If you want them to be financially secure, teach them skills and the money will follow. TC obsession is a blight.

Am I missing something? When they went to add money, do you go back in and increase the initial investment?

Are they actually investing anything? If so, wouldn’t the app for the brokerage do this with real numbers?

Not for the same audience but for much the same idea I made a progressive visualization of saving and compound interest in a blog post about pension saving:

https://calcwithdec.dev/posts/pictures-pensions/

I intentionally didn't include numbers at all - they are a bit more effort to interpret.

A visualization might be a nice feature for kids (but it probably depends on the kid!)

OP, love the idea, and cool to see a useful PWA!

One note: I noticed when opening the installed PWA in airplane mode, styles didn't load. You might be interested in this article on PWA caching from MDN:

https://developer.mozilla.org/en-US/docs/Web/Progressive_web...

Tangentially i can't help but notice a pattern. Generation1 says "build more homes", then they build them and convince Generation2 to invest despite ever climbing real estate prices. Then the internet happens and Generation2 says "build more companies". They build them , and proceed to convince Generation3 to invest in those companies despite ever climbing stock values. Seems like these trends run in cycles

> The phone is attached to the fridge and works as a panel or dashboard where my kids can see their money growing each day.

Or alternatively, your kids can see their money going up and down in value randomly, giving them constant anxiety if they're gonna lose it all while the US president uses the stock market as a pump and dump scheme.

The number one thing people fail to truly take advantage of is the triple tax advantage of HSA accounts. So powerful.

Even better is that you can save medical receipts throughout your life and withdraw all that money for any purpose in the future without paying income tax on it.

Found a fun little bug. If you try to type into the date picker, and press backspace, the entire screen blanks out. (MacOS 15.0.1, Safari 18.0.1)

Where can I find this 15% annual interest rate?

You forgot to add taxes, market crashes, sanctions, asset depreciation, companies goes bankrupt and other fun things.