# Gacha Calc: Probability Sim — Calculate Gacha Odds & Costs

> Calculate Gacha Odds & Costs (iPhone/iPad app by hyeokjin cho.)

- Source: https://appshunter.io/ios/app/gacha-calc-probability-sim/id6756255892 (this page in markdown: same URL + `.md`)
- Developer: [hyeokjin cho](https://appshunter.io/developer/1859562663)
- Category: Utilities, Lifestyle
- Price: Free
- Age rating: 17+
- Requires: iOS 14.0.0 · 36 MB
- Languages: American English, Japanese, Korean
- Released: 2025-12-08
- Data updated: 2026-10-06
- User reviews in markdown: https://appshunter.io/ios/app/gacha-calc-probability-sim/id6756255892/reviews.md

## What is Gacha Calc?

Are you a fan of in-game gacha draws, opening your wallet based solely on the hope of "This time, it has to drop"?
The [Gacha Calc: Probability Sim] is your essential tool, helping you predict spending and make smarter drawing plans based on mathematical probability, not just intuition.
Key Features
 - Accurate Probability Calculation (Independent Trials): Simply enter the item's drop rate (%) and your desired number of attempts. The app instantly calculates the "Probability of acquiring at least one item."
 - Predictive Table: We provide an easy-to-read table showing the minimum number of attempts and the estimated cost required to reach your target probability milestones (e.g., 50%, 90% success rate).
 - History Tracking: Conveniently save your calculation results and check your simulation data anytime in the history log, allowing you to track your past strategies.
 - Clean UI/UX: The app offers a simple, intuitive design that anyone can use—no complex formulas, just instant input and immediate results.
Stop Overspending Now!
Instead of relying on vague expectations, use the [Gacha Calc: Probability Sim] to predict your goal achievement rate and optimize your spending.


## Version history (last 5 releases)

### 1.1.7 — 2026-03-17

Improved input removal

### 1.1.1 — 2026-01-16

- Multilingual support

### 1.0.7 — 2025-12-12

사소한 버그 수정

### 1.0.6 — 2025-12-11

소소한 버그 수정

### 1.0.5 — 2025-12-10

사소한 버그 수정

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| [MisiPal](https://appshunter.io/ios/app/misipal/id6755193155) | — | Free | Utilities |
| [Gacha Architect : CALC](https://appshunter.io/ios/app/gacha-architect-calc/id6758045984) | — | Free | Utilities |
| [Gacha calculator](https://appshunter.io/ios/app/gacha-calculator/id6502886407) | — | Free | Utilities |
| [ギャンブル確率計算・シミュレーション](https://appshunter.io/ios/app/id6471646382) | — | Free | Utilities |

## More apps by hyeokjin cho

- [Fuel Calc: Cost Calculator](https://appshunter.io/ios/app/fuel-calc-cost-calculator/id6757098037)
- [MoneyStack: Goal-Based Spaces](https://appshunter.io/ios/app/moneystack-goal-based-spaces/id6760574365)

All apps by hyeokjin cho: https://appshunter.io/developer/1859562663

## Related topics

[genshin wishing simulator](https://appshunter.io/ios/topics/genshin-wishing-simulator)

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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 2026-10-06.*