Probability Sim vs Gacha Calc
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Probability Sim
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Probability Simulator 1T Trials is a powerful simulation app that lets you test probabilities to the extreme. Run up to 1 trillion trials and calculate probabilities as low as 1 in a trillion. Choose from decimal, percentage, or fraction notation. Simultaneously run multiple probability events for complex calculations. Perfect for statistics enthusiasts, mathematicians, and anyone interested in random trials. Sharpen your probability intuition and gain real insights from large-scale simulations.
Gacha Calc
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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 useβno 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.
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Verdict
The clearest difference is in-app purchases: Gacha Calc at none against Probability Sim's 2. Gacha Calc also leads on update cadence (daily vs every 10 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Probability Sim sells 2 in-app purchases, starting at $4.99 per month. Gacha Calc asks for nothing beyond the download.
Probability Sim ships an update every 10 months, Gacha Calc daily. The most recent releases landed on October 22, 2026 and October 6, 2026 respectively.
| Parameter | Probability Sim | Gacha Calc |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 months | Daily β better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 14.0.0 β better |
| Further details β not scored | ||
| Size | 29 MB | 36 MB |
| Age rating | 4+ | 17+ |
| Developer | kota tada | hyeokjin cho |
In-app purchases
Probability Sim
- Ad-free for 1 month7 Days trial$4.991 Month
- Ad-free for 1 year14 Days trial$49.991 Year
Gacha Calc
No in-app purchases
Questions
Is Probability Sim free?
Is Gacha Calc free?
Do Probability Sim or Gacha Calc have ads?
Which is updated more often, Probability Sim or Gacha Calc?
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