BookDuel is a free stock market game. You get pretend money, choose how it trades, and see where you rank. It's not a broker: nothing here buys real shares.
A book is a pot of pretend money plus the rules for using it.
Write your rules in plain words. On a set schedule, the AI reads them and buys, sells or holds for you.
You make every trade yourself at live prices. No rules to write.
Pick once: a book stays AI or Manual for life. Both kinds rank on one leaderboard.
A book is a pot of pretend money plus the rules for using it. Name it, say what it may buy (a theme like "big US tech" is enough), and choose your starting cash, like $1,000.
Starting cash can't change after you save. Then press Activate to start the clock.
A draft is a book you've saved but not activated yet. It isn't ranked until you press Activate.
Optional: paste your rules into any AI chat to tidy them up.
bookduel-project.json and bookduel-chat.json.Skip this if you like. You can do it any time, as often as you like. Your starting cash stays the same whatever the file says.
On a set schedule, the AI reads your rules and picks a move: buy, sell or hold.
Stock books: checked 3 times each weekday, about 10 AM, 12 PM and 3 PM ET. Crypto books: up to 8 times a day, every day, weekends included. A rule like buy and hold is a strategy the AI follows: the book is still checked every trading day and can buy or sell when its rules say so.
Manual book? You make the trades yourself, any time. When the market is closed, a manual trade fills right away at the last closing price.
Every book is ranked by gain per day: how much it grew, in % a day, since you pressed Activate. Whoever grows their money the most per day ranks highest. Because it's a percent per day, a $100 book can beat a $10,000 one.
Seven benchmarks sit on the board too, one unit each bought on September 1: S&P 500 (SPY), Nasdaq 100 (QQQ), Bitcoin (BTC), Ethereum (ETH), Solana (SOL), XRP coin (XRP) and SPCX. Can you beat them?
Your starting amount plus any cash you've added. You can set a book to add cash on a schedule (like every week). Money can never be taken out. Example: start with $1,000 and add $100 later, and the total deposited is $1,100.
A book's total gain % divided by its days, shown as “% a day”. Every calendar day counts, weekends included, and the day you press Activate is day 1. Example: you put in $1,000. On day 10 (the day you press Activate counts as day 1) it's worth $1,030. That's a $30 gain, or 3.0%. 3.0% ÷ 10 days = +0.30% a day.
Duels is a separate weekly game. Everyone starts the week with $1,000 of pretend money. Play the robot, play a person, or join a weekly league. Whoever grows their money the most per day wins. The week ends Sunday at 11:59 PM ET.
No. Everything uses pretend money. BookDuel is a game, not a broker. Nothing here buys real shares.
Yes. BookDuel is free during the Limited Alpha.
Manual: you make every trade yourself, any time (when the market is closed, it fills at the last closing price). AI: you write rules in plain words and the AI trades them on a set schedule (stock books 3 times each weekday, crypto books up to 8 times a day). You pick once per book.
Yes. Same leaderboard, ranked the same way: % a day.
Yes. Make as many books as your account allows, and mix Manual and AI.
No. Step 2 (polishing your rules in an AI chat) is optional. Your AI book trades from the rules you write when you make it.
Stock books: checked 3 times each weekday, about 10 AM, 12 PM and 3 PM ET. On early-close days, the last stock round is at 12:30 PM ET. Crypto books: up to 8 times a day, every day, weekends included. Each time, the AI may buy, sell or hold based on your rules.
% a day: a book's total gain % divided by its days. Every calendar day counts, and the day you press Activate is day 1. Put in $1,000, be worth $1,030 on day 10, and that's 3.0% ÷ 10 = +0.30% a day.
A separate weekly game. Everyone starts the week with $1,000 of pretend money and plays the robot, a person or a weekly league, up to 10 duels a week. Whoever grows their money the most per day wins. Scoring ends Sunday at 11:59 PM ET.
Scoring ends Sunday at 11:59 PM ET. Every Monday at 8:30 AM ET, everyone goes back to $1,000 for the new week.
Build an AI trader in plain English. Then duel it.
Free during the Limited Alpha. Pretend money. Stocks + crypto.