Probability vs Trillion
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Probability
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Probability Calculate the probability of conditional events or unconditional events. Conditional events Example: What is the probability of throwing one six with a dice in throw number two with the condition that throw one was a six. Unconditional events Example: What is the probability that it will be some six in two throws with a dice whether it is throw number one or two. Up to ten events can be linked together.
Trillion
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: Probability at none against Trillion's 2. Probability also leads on ads (none vs shown) and iOS requirement (9.0 vs 13.0). On price, update cadence and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Trillion sells 2 in-app purchases, starting at $4.99 per month. Probability asks for nothing beyond the download.
Probability ships an update every 18 months, Trillion every 12 months. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.
| Parameter | Probability | Trillion |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 18 months | Every 12 months โ better |
| Ads | No โ better | Yes |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPod | iPhone, iPad, iPod โ better |
| Requires iOS | 9.0 โ better | 13.0 |
| Further details โ not scored | ||
| Size | 1 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | domesticusdevelop | kota tada |
In-app purchases
Probability
No in-app purchases
Trillion
- Ad-free for 1 month7 Days trial$4.991 Month
- Ad-free for 1 year14 Days trial$49.991 Year
Questions
Is Probability free?
Is Trillion free?
Do Probability or Trillion have ads?
Which is updated more often, Probability or Trillion?
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