# Principle: Stock Backtest Sim — Backtest before you risk money

> Backtest before you risk money (iPhone/iPad app by 주식회사 유자.)

- Source: https://appshunter.io/ios/app/principle-stock-backtest-sim/id6776831023 (this page in markdown: same URL + `.md`)
- Developer: [주식회사 유자](https://appshunter.io/developer/1851710513)
- Category: Finance, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 49 MB
- Languages: American English, Korean
- Released: 2026-07-21
- Data updated: 2026-08-03
- User reviews in markdown: https://appshunter.io/ios/app/principle-stock-backtest-sim/id6776831023/reviews.md

## What is Principle?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 33 Tokens | $4.99 | one-time |
| 115 Tokens | $14.99 | one-time |
| 600 Tokens | $59.99 | one-time |
| 10 Tokens | $1.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-08-01

• 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

### 1.0 — 2026-07-22

No release notes.

## More apps by 주식회사 유자

- [노럭 - 역발상 로또 번호 생성·관리](https://appshunter.io/ios/app/id6755067659)
- [Yuja Decibel Meter - dB Level](https://appshunter.io/ios/app/yuja-decibel-meter-db-level/id6759799015)

All apps by 주식회사 유자: https://appshunter.io/developer/1851710513

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-03.*