Stock investment simulator

Your portfolio

Paper investing

REAL PRICES. ZERO FINANCIAL RISK.

Back your thinking.
Not with your savings.

Put a hypothetical $1,000 behind your next big idea.
Let the market put your hypothesis to the test.

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ALL-TIME RETURN

—Your next idea starts here

Total paper value USD

$0.00

Hypothetical capital

$0.00

Total gain / loss

—

Active hypotheses

0 in the market

How your ideas are performing

Profit and loss, with new investment capital excluded

Your hypotheses S&P 500 · SPY
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Every portfolio starts with an idea.

Your performance chart begins with your first hypothesis.

Waiting for your first investmentAuto-refresh · 60s

Your hypotheses 0

Small experiments. A better understanding of the market.

Stock investment simulator A space to test your conviction.Simulated investments only · No brokerage connection

A NEW EXPERIMENT

What’s your hypothesis?

Start with a belief. Put $1,000 of paper money behind it.

Look up a stock to see its latest available price.
Paper investment$1,000.00 USD

Fractional shares at the latest available quote. Outside market hours, the latest close is used. Final entry price is confirmed when you start.

Close the loop.

Closing locks the latest available value and benchmark return. This cannot be undone.

Real markets. Paper money.

Each hypothesis gets its own hypothetical $1,000 USD. This is an independent experiment, not a withdrawal from a shared cash balance.

Your entry price is the latest available Yahoo quote. Prices refresh every minute while this page is open; they can be delayed. Closed markets use their most recent quote.

We compare each investment with $1,000 in SPY, an ETF tracking the S&P 500. Returns account for stock splits, but exclude dividends, trading fees, taxes and slippage.

The chart records observations while you visit, including closed experiments at their frozen values. It does not backfill prices while you’re away.

Your portfolio belongs to this browser. A private key in browser storage accesses your server-saved journal. Clearing storage loses access; exports preserve a readable copy, not a login. No cross-device account is included.

For education only. No real trades are placed.