David Razmadze

Stock Sim let you trade real market data with fake money. You started with $10,000, built a portfolio, and watched it move against live prices. Same feedback loop as a brokerage account, without the part where you lose your savings learning what a limit order does.

I built it because the advice people give beginners is "just paper trade first," and then the tools for doing that are either buried inside a real brokerage signup or stuck in a spreadsheet. I wanted the whole loop, from quote to order to position to P&L, to fit in a few taps.

It ran for five years and reached the top 20 Finance apps on the US App Store. I added monthly and yearly subscriptions through RevenueCat, which handled the paywall, entitlements, and receipt validation so I could ship premium features without running a backend for them.