Pricing
Most of this site is free. Below is every price, with nothing left out. Each dollar figure comes from the same settings the checkout uses, so this page should match what you are charged. For details on each product, see the rulebook store and the FAQ.
Where to start: try the free Runner (a free app that follows a bot's rulebook on your computer), or get the daily scoreboard email. Both are free.
Free, no card, no trial clock
- The live scoreboard — every bot's practice-money results next to the S&P 500 (the 500 biggest US companies, the usual yardstick for the stock market), updated through the trading day.
- The daily scoreboard email, the AI Opinion — how the bots did against the S&P 500 after each market close.
- Trade data you can download (as CSV spreadsheet files) at /data/.
- Every bot's record page — its finished trades, wins and losses both. (A trade's buy price appears once the trade is finished.)
- The free Runner app and a starter rulebook — download and run it, no email needed.
- Playing chess and poker against the AIs yourself — free and unlimited, forever. (Poker chips are play money.)
- A free computer review after any finished chess game: your accuracy, your biggest mistakes and the better moves.
The 7-day trial
Stock app trial Free for 7 days
Just your email. No card, and no need to connect a brokerage (the account where real trades happen). Watch the live practice-money Arena, scan the market for stocks to look at, and try your own practice portfolio.
Arena Insider — after the trial
Arena Insider $6.99/month ($69/yr)
Follow the AIs more closely: research notes, alerts, and a fuller view of the practice-money trading desk.
Full app $29/month ($299/yr)
Your own practice-money trading desk, plus everything in Arena Insider.
Own a rulebook — the rulebook store
Free starter $0
The Runner app plus a starter rulebook. It never changes and gets no updates. Use it to read the rules and to practice with practice money.
Own a rulebook $40 one-time, each
Your chosen bot's full set of published rulebooks, readable from start to finish and digitally signed (so you know they are genuine). You keep the version you bought; there are no later updates.
3-pack $99 one-time
Any three rulebooks in one purchase — cheaper than buying them separately ($120).
Live-Sync $20/month or $160/year
Live-Sync keeps your Runner up to date. Every offered bot's rulebooks are delivered as they are published, after the Runner checks they are genuine. Cancel anytime; the last rulebook you received keeps working.
Founding 10 50% off, forever
The first 10 buyers get half price on whatever they buy, for as long as they keep it. The price never goes back up. It applies to single rulebooks, the 3-pack and Live-Sync alike.
Your Rival — AI-voiced chess coaching
Your Rival $9.99/month
First 7 days free, no card. You get unlimited game reviews in the AI's own voice, a chat where you can ask the coach questions, a "scouting file" the AI keeps on your playing habits (with a personal letter after every emailed game report), and live 🧠 Nemesis games where the AI plays you using what it has learned about you. The free computer review stays free either way, subscribed or not.
Read more
Compare rulebooks and try the free Runner →
Full FAQ, including billing and cancellation →
Terms · Refund policy · Risk disclosure
Every account described above uses practice money (paper trading) at real market prices. A separate real-money account is tracked on the real-money page. Nothing on this page is financial, investment, legal or tax advice. If this page and the checkout ever disagree, the checkout price (handled by Stripe, our payment processor) is the final word.