Comparison

BRISTOL vs Probability Sim

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

Head to head
About

BRISTOL

Features
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The Bristol Calculator provides a platform for both simple and more technical calculations involving vectors, matrices and complex numbers. Separate input and output screens with touch cursor control facilitates editing and checking. Option settings provide control over the output and input screen presentation.ย  Keys can be personalised for often used functions and variable names. Data entry is also possible from the hardware keyboard as well as the calculator's screen keypad. Help pages provide built in contextual help. Work can be saved and templates created for future calculations. Vectors, matrices and complex numbers are handled by the same basic function operators used for numbers; the context determining operation. As well as standard mathematical functions, bespoke routines for sums, products, matrix inversion, numerical integration and solving transcendental equations are included. User functions can also be created. Table and graph plot functions display results. The free version of the Bristol calculator allows two files to be stored. A modest one-off In-App purchase unlocks this restriction. Otherwise, the free version is fully functional. This is a standalone application and there are no links to advertisers or third party software.

About

Probability Sim

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

BRISTOL4 screens
Probability Sim2 screens

Verdict

The call

The clearest difference is ads: BRISTOL at none against Probability Sim's shown. BRISTOL also leads on update cadence (monthly vs every 10 months). On price, in-app purchases, device support and iOS requirement 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. BRISTOL sells 1 one-off in-app purchase and Probability Sim sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

BRISTOL ships an update monthly, Probability Sim every 10 months. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

Scorecard2 real differences ยท 4 level
BRISTOL versus Probability Sim: the parameters behind the verdict, then further details
ParameterBRISTOLProbability Sim
PriceFreeFree
Update frequencyMonthly โ€” betterEvery 10 months
AdsNo โ€” betterYes
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.7 โ€” better15.0
Further details โ€” not scored
Size3 MB29 MB
Age rating4+4+
DeveloperChristopher Brittonkota tada

In-app purchases

1 purchases

BRISTOL

One-time1
  • bristol calculator storage$3.99
2 purchases

Probability Sim

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

Questions

Is BRISTOL free?
BRISTOL is free to download, with in-app purchases available.
Is Probability Sim free?
Probability Sim is free to download, with in-app purchases available.
Do BRISTOL or Probability Sim have ads?
Probability Sim shows ads; BRISTOL does not.
Which is updated more often, BRISTOL or Probability Sim?
BRISTOL ships an update monthly, and Probability Sim every 10 months. Most recently, BRISTOL was updated on October 25, 2026 and Probability Sim on October 30, 2026.

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