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Posted by roberdam 10/30/2025

Show HN: In a single HTML file, an app to encourage my children to invest(roberdam.com)
247 points | 437 commentspage 2
meatjuice 10/30/2025|
I can feel the vibe-coding "vibe" from every vibe-coded websites, somehow.
lm28469 10/30/2025|
When 50% of the words are bold you know you're in for a treat
pton_xd 10/30/2025||
My decade in the making habit of only reading HN comments is finally paying off. Nowadays when I do randomly skim an article it's almost always slop.
thw_9a83c 10/30/2025||
Nice! I also created a "virtual bank account" for my kids when they were 7-8yo. They can choose to take the weekly cash or put it in their savings account. My bank gives them a 5% interest rate per month, which isn't bad. Explaining the idea of compound interest this way is easy.

However, I think that's the easier part of being an investor. The more complicated part is risk management. With a savings account, there is basically zero risk. But that's not how you invest these days.

mattmanser 10/30/2025|
5% per month? Where is this crazy money generator? Assume you meant per year here!

It's not zero risk:

- Your currency may collapse, see Germany 1930s, Argentina, Zimbabwe, Venezula, etc.

- Only a certain figure is protected in savings, though governments will act aggressively to protect that (see 2008 + the Icelandic/UK/Dutch palava)

thw_9a83c 10/30/2025||
Yes, it's 5% per month. You wouldn't be able to explain the concept of a yearly compound interest rate to such young children. One year is an eternity in their life. I also don't give them too much pocket money to encourage them to save. They would spend it on junk food if they had too much cash.

A agree, that the currency is not a 100% safe investment. Inflation especially makes it bad for long-term savings. Indeed, money in any savings account is insured only up to a certain amount. However, that's not something you can explain to kids with a "virtual account." I suppose the idea that Daddy's bank will go bankrupt is probably not an ideal way to teach kids financial literacy.

LandR 10/30/2025||
Will they also have periods of a bear market and see their money go down ?
roberdam 10/30/2025|
hopefully, “The first national bank of dad” remains solvent.
patapong 10/30/2025||
And can they take loans with negotiated interest rates and lock-in periods? Or invest in more risky products such as derivatives with a corresponding chance to lose all money? So much potential... ;)
ozim 10/30/2025|||
First they have to fill in KYC questionnaire and have no risky products if they did not have investing experience.
sebastiennight 10/30/2025||||
Just add a $6-7CHICKENJOCKEY memecoin where they can put money in, see a 50% daily return for a random period of time, and suddenly have it go to zero.

Or even worse, in the tradition of these unclickable javascript buttons of the late 1990's, just detect when the finger is approaching the "withdraw" button and have the asset crash right before they can click!

roberdam 10/30/2025|||
unlimited apps ideas :D
yaky 10/30/2025||
Be careful with comparing real-life things and experiences with a (virtual) number on a screen, especially for children.

I used to know an adult who only cared about that number going up, despite making more than a comfortable amount of money. Live with parents, save on rent/mortgage, number goes up faster. Buy cheapest food, take leftovers from work-catered lunches, number goes up faster. Scam your way into being hired for a position you are severely underqualified for, get terminated after three months, keep the salary and sign-on bonus, number goes up. Invest pretty much everything (because there are almost no expenses), compound interest.

ericyd 10/30/2025||
This feels like a severe anecdotal example which I'm not sure applies to most people.
yaky 10/30/2025||
It is definitely a single point, but that is who this post immediately made me think of.

And to be fair, investing does not apply to most people either.

unmole 10/31/2025||
> And to be fair, investing does not apply to most people either.

Why doesn't investing apply to most people?

encrypted_bird 11/1/2025||
Because most people are neither properly educated about investing nor have the money to spare to even start.

Most people are living paycheck to paycheck.

ct0 10/30/2025|||
Agreed, in 7th grade we did a stock market simulation, it made winning feel too easy.
nxor 10/30/2025||
Ahah but green ticker good red ticker bad. What's the problem sir
dangus 10/30/2025||
Being encouraged to invest is nice but having the ability to is a massive luxury.

I knew I wanted to save a lot for my future and retirement since I was in high school. I didn’t gain any reasonable ability to do so until much later.

A much better life skill in my opinion would be to teach about budgeting, how to cook economical meals, how to avoid debt traps and lifestyle inflation.

yaky 10/30/2025||
HN is a very specific and privileged demographic, very far from an average citizen. (of the US at least)
encrypted_bird 11/1/2025||
Not the OC, but yeah I've noticed this myself actually. I read HN because I love science and technology, but I don't work in either area. I work at a dead-end job as a cashier and barely make ends meet. Some of the people on here are exceedingly privileged and really don't realize it.
ericyd 10/30/2025||
I'm always bummed when I comment on HN and then scroll down and find another comment which said it better.
pmg102 10/30/2025||
You're giving a 15% growth rate with zero volatility? That isn't going to teach many important lessons.

How about offering a range of rates with volatility increasing as rate increases. Then they can think about the benefit of guaranteed return vs the benefit of long-term growth, or a combination of both.

sebastiennight 10/30/2025|
OP: I think introducing volatility (which you can just model with one percentage variable and a sinusoidal multiplier based on this: 100% volatility means if your "real" balance was going to be $100 today, it varies between $0 and $200 ; 10% volatility means you're fluctuating between $90 and $110) is also a good idea in teaching kids to refrain from the impulse of withdrawing the money just because today's daily gain is in the red.

Another add to the feature request list :)

pmg102 10/30/2025||
The biggest challenge with pensions is convincing people in their 20s to invest in high risk/high return investments. This is usually the right strategy because of the long time horizon of several decades until they will need to crystallise losses/gains.

However if they see their pension balance fall in a big correction, they can panic and move to less volatile investments, thus reducing their long term gains.

You can theorize all you want but the best way to learn to cope with this is for it to happen to you so it would be great to include it in the simulation!

a96 11/3/2025||
I think an even better option would be to show diversification. You could have some part in a higher risk volatile thing and another part that shows steadier positive growth. Get people to decided how much of each to mix. One of the most important lessons is that all your eggs don't need to be and usually should not be in one basket.
lutusp 10/30/2025||
> I explained to my kids that investing is like having a magic box that generates more money over time.

That is wildly misleading. Investing is super important, but it shouldn't be described in this fairy-tale way. Young people might be misled into trusting investment advisors/counselors/brokers, whose real goal is to enrich themselves at your expense. In fact, there are adults who haven't yet learned this.

An article about investing that doesn't mention the WSJ dartboard contest isn't worth reading -- essentially, over 14 years, random stock picks produced returns equal to those of stockbrokers, before the stockbroker's fees and other costs were subtracted.

An investment counselor's primary goal is to make you think you need his services. His secondary goes is to keep you from performing your own research to discover that is false.

roberdam 10/30/2025|
never speak about investment counselors on the article, I will forward the WSJ article to my 7 year old girl so she won't be scammed by her broker (me).
_ache_ 10/30/2025||
How can you have a localhost reference as canonical? You should fix your jekyll configuration I guess.

<link rel="canonical" href="http://localhost:8080/en/dinversiones" />

roberdam 10/30/2025|
Thanks for the tip, should be fixed now !
bhu1st 11/5/2025||
If you don't have an old device lying around to make use of, here's an X thread I found a while ago supporting similar habit for kids: https://x.com/ValKatayev/status/1926734004314624481

I have set up a similar Google sheet for my 12 yo, which is shared with him on view-only mode. He loves the idea that he's earning $$ every day out of his savings. He's on fire to grow his investment to the point that he earns $5 every day, "while sleeping". He's currently making ~$2/day.

beej71 10/30/2025|
Happy to see a PWA. These things need to make a comeback for a variety of reasons.
alternatex 10/30/2025|
Though for a PWA JavaScript is required so not a single HTML file.
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