Stock Trading Journal
A kid buys and sells on real prices, and writes down 'why I bought it' every single time.
A project built directly by Ted TH Lee.
Why I built it
Stocks in the news, numbers going up and down — it's all distant to a child. I wanted them to feel the rhythm of buying, selling, and waiting without risking real money, and above all to build the habit of writing down 'why did I buy this?'
What it does
- Each kid trades through their own account, linked to real Korean market prices (KOSPI/KOSDAQ).
- Every order requires a reason for buying or selling — that's the heart of the trading journal.
- See daily profit and loss and current holdings at a glance.
- Real commissions and taxes are factored in to keep it close to the real thing.
- Stock detail views (candles, moving averages) to read the trend.
Who it's for
Families who want kids to safely build the habit of investing and reflecting on 'why I decided that'
How it was built
This is a practice ground for more than watching a price rise or fall. A child trades against real Korean market prices without putting real money at risk, then leaves a decision in their own words. That preserves the experience of buying, selling, and waiting while keeping it safe.
Charts and profit-and-loss views are there to inspect the result of a decision. The centre of the app is the small field that requires a reason before an order can go through, so that reason and its outcome can be revisited later.
How you use it
Inspect a stock and its price
Each child uses a personal account to view live KOSPI/KOSDAQ prices and stock details with candles and moving averages.
Write a reason before ordering
A buy or sell requires a written reason first, rather than allowing a decision to disappear into a button press.
Return to the result
Holdings and daily profit and loss can be read alongside the original decision, with commissions and taxes reflected in the result.
Questions
- Does it trade with real money?
- No. It uses real Korean market prices, but it is a practice ground designed so a child does not lose real money.
- Does it provide investment advice?
- No. This is a family learning journal with no real-money trading. It does not recommend a specific stock or promise a return.
- Why require a reason for every order?
- The central habit is not only seeing a result, but recording why a decision was made and being able to revisit it later.
- Are commissions and taxes included?
- Yes. They are reflected so repeated trading also carries the feeling of real-world costs.
Where it is now
The first set of features is finished and verified end to end locally — it's right before deployment. I'm sorting out the scope and method for opening it up.