Comparison

Probability vs Trillion

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Probability

Features
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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.

About

Trillion

Features
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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

Probability2 screens
Trillion2 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Trillion sells 2 in-app purchases, starting at $4.99 per month. Probability asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences ยท 3 level
Probability versus Trillion: the parameters behind the verdict, then further details
ParameterProbabilityTrillion
PriceFreeFree
Update frequencyEvery 18 monthsEvery 12 months โ€” better
AdsNo โ€” betterYes
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPodiPhone, iPad, iPod โ€” better
Requires iOS9.0 โ€” better13.0
Further details โ€” not scored
Size1 MB29 MB
Age rating4+4+
Developerdomesticusdevelopkota tada

In-app purchases

None

Probability

No in-app purchases

2 purchases

Trillion

Subscriptions2
  • Ad-free for 1 month7 Days trial$4.991 Month
  • Ad-free for 1 year14 Days trial$49.991 Year

Questions

Is Probability free?
Probability is free to download, with no in-app purchases.
Is Trillion free?
Trillion is free to download, with in-app purchases available.
Do Probability or Trillion have ads?
Trillion shows ads; Probability does not.
Which is updated more often, Probability or Trillion?
Probability ships an update every 18 months, and Trillion every 12 months. Most recently, Probability was updated on October 6, 2026 and Trillion on October 5, 2026.

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