---
name: "Finn"
tagline: "Finn doesn't teach you the stock market. It makes you feel it."
description: "A paper-trading game for iOS and Android. Trade through more than five decades of real market history with play money, from 1970s stagflation to the 2024 AI boom. Learn investing by living it. Now in TestFlight alpha."
platforms: ["ios", "android"]
status: "beta"
canonical: "https://blog.chensagi.com/apps/finn"
---

Finn is a time machine with a brokerage account. Pick a moment in history, get
a stake of paper money, and trade it forward one day at a time. The prices are
real. The crashes are real. The only thing simulated is your money.

## The core loop

Every mode runs on the same engine: real historical prices, played forward day
by day.

- **Drop into history.** Nineteen eras, real dates, real prices, from a 1970s oil shock to the 2024 AI boom.
- **Make your calls.** Buy, sell, short, set a stop-loss. Advance a day at a time, or boost ahead at up to 300x to skip the quiet stretches.
- **Live with the outcome.** Some trades look brilliant by Friday. Others teach you why the pros sit on their hands. The money is paper. The lesson is not.

## Six ways to play

| Mode | What it is |
|---|---|
| Campaign | Ten chapters of market history. Each level is a different test: survive a crash, hedge a position, time an earnings report. Stars reward performance, with no hand-holding. |
| Academy | 23 mentor-led lessons across five paths, from reading a chart to trading the 2008 crash beside a simulated Warren Buffett. |
| Daily Challenge | One challenge a day, seeded from the date so everyone plays the same one. Build a streak. |
| Curated Challenges | 16 hand-built scenarios that unlock as you go. Double your money in 60 days, or turn a profit using only short sells through the dot-com bust. |
| Free Play | Any of 19 eras, all 104 stocks, no rules. The sandbox. |
| Tutorial | A 36-step on-ramp that teaches the controls. |

## Under the hood

Behind the feeling sit 104 real companies under aliased names, with a setting to
flip on the real tickers any time. Every stock carries quarterly SEC financial
statements, the actual news headlines of its trading days, and, on iOS, an AI analyst
you can ask anything. Climb a nine-tier career from Retail Investor to Market Legend
as you go. No account is required to play, and your games stay on your device
unless you choose to sign in.

*Finn is a simulation for education and entertainment. It is not investment
advice.*