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  • Gacha Calc: Probability Sim screenshot 1
  • Gacha Calc: Probability Sim screenshot 2
  • Gacha Calc: Probability Sim screenshot 3
  • Gacha Calc: Probability Sim screenshot 4

About Gacha Calc: Probability Sim

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.

What’s new

Version 1.1.7 · Updated March 17, 2026

Improved input removal

App privacy

The developer, hyeokjin cho, reported these privacy practices to Apple.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Usage Data: Product Interaction

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Usage Data: Product Interaction, Other Usage Data

Used for: Third-Party Advertising, Analytics, App Functionality

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