
Principle: Stock Backtest Sim
Backtest before you risk money
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Free
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About
How long will you keep investing on gut feeling?
Build your trading rules without code. Test them on US and Korean stocks.
Combine moving averages, stop-loss, and partial take-profit to backtest your strategy.
For education and entertainment only. Past simulation does not predict future results.
Build rules. Let the data answer.
-- Rule Builder
- Set moving average periods, stop-loss, and take-profit with a few taps
- No coding required, ready in 1 minute
- Combine partial buy/sell, multi-stage take-profit, and more
-- Historical Backtest
- US and Korean daily stock data
- 1 token per stock
- Cached results reuse on identical conditions (no extra token)
-- Result Analysis
- Cumulative return chart
- Buy/sell signal markers on the price chart
- Maximum drawdown, win rate, average holding period and more
-- Share Your Rules
- Share your rules with friends
- Import rules from others and backtest them yourself
-- Invite Friends
- Verify more, together
- Share your invite code; when a friend signs up and enters it,
- you and your friend each get 15 tokens (up to 10 invites per month)
-- Token Packs
- 4 token packs: 10 / 33 / 115 / 600 tokens
- Larger packs include more bonus tokens
-- Disclaimer
- This app is an education and entertainment simulation tool.
- This app does NOT provide investment advice, stock picks, or trading signals.
- Backtest results are simulations based on past data and do not guarantee future returns.
- This app is NOT connected to live trading.
- The company assumes no responsibility for any losses in actual trading.
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What's New in Principle
1.0.1
August 1, 2026
• Fixed the Skip button not responding during onboarding • Fixed an issue where free trial results were not displayed • Added an error message when sign-in fails • Improved wording for clarity
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In-App Purchases
$4.99
33 Tokens
33 backtests · 3 bonus tokens included






