Gerald Chen
Things I've built to learn, practise and write.
Five projects, all live. Each one has a short note on why I made it and what it does.
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The Healing Pages
Why I built it. I wanted a quiet place to write one small page a day, and to hear it back by reading it aloud. Functions essentially like a therapy journal, really simplistic.
What it does. A daily journal that tracks your streak, pages and word count, shows a calendar of what you've written, and has a recite mode for reading a page out loud.
Open site -
The Irrational Margin
Why I built it. I wanted to write about why people decide the way they do, and what it costs them.
What it does. A blog of essays on behavioural economics, where psychology meets the way people spend, save and choose.
Open site -
Root T
Why I built it. I wanted to understand how options are priced, not just memorise the formula.
What it does. Prices a European call option with 100,000 random simulations, then compares the result live against the Black-Scholes formula across 40 strikes and 20 maturities.
Open site Code on GitHub -
IB Probability Lab
Why I built it. I wanted to revise IB Maths AA probability properly, and give other students on the course something better than a page of formulas. Mainly it's formatted towards my way of learning one of the most annoying and knowledge based topics in AAHL, unlike calculus where the application of formulas will get the answer.
What it does. Covers every SL and HL probability topic with live models you can drag, Casio fx-CG50 and TI-84 keystrokes, and unlimited randomised practice questions with full working.
Open site -
Edge Lab
Why I built it. I'm interested in trading, and I wanted somewhere to practise the probability and mental maths that trading interviews test.
What it does. Interactive games for trading-interview prep: market making, ETF arbitrage, Bayes, Kelly sizing and a poker room, plus a Daily Gauntlet with a leaderboard.
Open site