---
title: "Probability-Distributions - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Replace your statistical tables with an interactive, graphical app! Compute probabilities & percentiles, and plot the probability density/mass function for the Beta, Chi-Square, Exponential, F, Gamma,"
---

# Probability-Distributions — United States

![Probability App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/77/0b/b6/770bb680-6444-5ae3-4a26-8111cc96169e/AppIcon-0-0-1x_U007ephone-0-1-85-220.png/434x0w.png)

**Developer:** [Matthew Bognar](https://apptail.io/developer/matthew-bognar-Djrb)
**Category:** Education
**Rating:** 4.9/5 (193 ratings)
**Price:** $1.99
**Bundle ID:** com.mbognar.Probability-Distributions
**Store:** Apple App Store
**Country:** United States
**Version:** 6.2.0 (released 2026-10-27)
**Original Release:** 2014-06-29
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id889106396)
**AppTail Page:** [https://apptail.io/app/probability-distributions-dHP/united-states](https://apptail.io/app/probability-distributions-dHP/united-states)

## Probability Description
Replace your statistical tables with an interactive, graphical app! Compute probabilities & percentiles, and plot the probability density/mass function for the Beta, Chi-Square, Exponential, F, Gamma, Gumbel, Logistic, Lognormal, Normal, Pareto, t, Triangular, Uniform, Weibull, Binomial, Geometric (2 versions), Hypergeometric, Negative Binomial (2 versions), and Poisson distributions. Now supports Español.

## Probability Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d6/1f/23/d61f230b-7421-894b-874f-dd311360ded4/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.08.05.png/1320x2868.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/5d/56/05/5d56059b-c2d1-016c-56f1-b55627ac9b5c/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.08.38.png/1320x2868.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/02/94/56/02945630-eaa6-083b-841f-7a5099a048ec/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.12.23.png/1320x2868.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/0c/f8/51/0cf8519d-1ba9-5484-d157-0d4ed122f347/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.09.01.png/1320x2868.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/41/b7/e0/41b7e055-34bc-391e-624c-270bc216d261/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.09.54.png/1320x2868.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/9b/51/52/9b515214-c690-e9c2-00f4-3885130abced/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.09.13.png/1320x2868.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/fe/7e/4c/fe7e4c5a-6882-612f-64af-fbdb920a74ed/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.09.23.png/1320x2868.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/14/48/9a/14489a0b-d828-ad69-453e-e5b2cfd1cfa9/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.10.08.png/1320x2868.png)
- [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/38/27/2f/38272f8b-7f06-4d3e-47b1-af10212aa97f/Simulator_Screenshot_-_iPhone_17_Pro_Max_-_2026-10-05_at_12.10.28.png/1320x2868.png)

## Probability Rating Breakdown in United States
- 5 stars: 187 (97%)
- 4 stars: 0 (0%)
- 3 stars: 2 (1%)
- 2 stars: 0 (0%)
- 1 stars: 4 (2%)

## Probability Reviews in United States

### ***** "Finally!  A simple, free N(0, 1) calculator."
Subject line says it all.  P(Z<x) for normal and a bunch more for essential statistical tests.  THANK YOU!!!!
-- Uh, your Mom., 2024-03-31

### ***** "Sick App"
I love probability distributions.
-- Juniorlaggers, 2021-10-04

### ***** "iPhone SE (2020) issue has been fixed"
Works perfectly now. Much better than using tables.
-- Matt-Jim, 2020-11-13

### ***** "BOGNAR IS THE GOAT"
Goat status: 100%
-- Jared Gellner, 2020-02-12

### ***** "Does advanced functions for free!"
This could be really useful for students in college stats courses who are on a budget and can’t afford to buy a $100+ dollar graphing calculator. It does basic advanced functions like binomial pdf - for free.  I don’t know if it does invNorm or Z-Test calculations ( possibly not) but for a calculation app that you don’t have to pay for this is pretty great and was just what I was looking for.
-- Some College Student from WA, 2019-11-19

### ***** "Nice"
Easy my learning
-- MaverickPig, 2019-03-13

### ***** "So handy"
I had Bognar as a professor multiple times in college and his app always came in handy. Whether on homework or studying for actuary exams, it’s always nice to have an app that can quickly compute values, in addition to showing graphs that help visualize data.
-- Kiersten D, 2019-02-27

### ***** "Solid app"
My professor created this for his students and I must say Professor Bognar is the juice cuz this works very well.
-- slamduncn, 2019-02-08

### ***** "really useful app"
Love this app! Web app on hypothesis testing and confidence interval is even more useful, especially the version where raw data can be the input!!
-- starstarset, 2019-02-08

### ***** "Nice exploratory tool"
Doesn’t try to do a lot, but what it does it does very well.  Thank you for this app.

(Future feature request, if you have time: Allow setting plot boundaries.  e.g. for Beta, it’s sometimes illuminating to set the x bounds to (0,1).)
-- Mxba99, 2018-12-12

[View all Probability reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)


## Probability Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Argentina | Education | #1 |
| Top Paid | Argentina | Overall | #3 |
| Top Paid | Mexico | Education | #12 |
| Top Paid | Colombia | Education | #58 |
| Top Paid | Mexico | Overall | #114 |
| Top Paid | Canada | Education | #115 |

## Probability Discovered Keywords
- probability
- statistics
- statistical calculator
- distributions
- probability and statistics
- probability calculator
- learn statistics
- square off
- probability distributions
- statcrunch

## Apps Similar to Probability
- [GeoGebra 图形计算器](https://apptail.io/app/geogebra-dak/united-states)
- [Scientific Calculator Plus 991](https://apptail.io/app/scientific-calculator-plus-991-FMq/united-states)
- [IntroStat - Statistics Solver](https://apptail.io/app/introstat-statistics-solver-BNA/united-states)
- [GeoGebra 3D Calculator](https://apptail.io/app/geogebra-3d-calculator-jRfc/united-states)
- [WolframAlpha](https://apptail.io/app/wolframalpha-fggc/united-states)
- [GeoGebra Calculator Suite](https://apptail.io/app/geogebra-calculator-suite-owUc/united-states)
- [GeoGebra CAS Calculator](https://apptail.io/app/geogebra-cas-calculator-fMFd/united-states)
- [statmagic PRO](https://apptail.io/app/statmagic-pro-Nmje/united-states)
- [Art of Stat: Distributions](https://apptail.io/app/art-of-stat-distributions-cFJe/united-states)
- [Probability Distribution](https://apptail.io/app/probability-distribution-NWbm/united-states)

## Probability Available In
- [United States](https://apptail.io/app/probability-distributions-dHP/united-states)
- [Argentina](https://apptail.io/app/probability-distributions-dHP/argentina)
- [Mexico](https://apptail.io/app/probability-distributions-dHP/mexico)
- [Colombia](https://apptail.io/app/probability-distributions-dHP/colombia)
- [China](https://apptail.io/app/probability-distributions-dHP/china)
- [Brazil](https://apptail.io/app/probability-distributions-dHP/brazil)
- [Chile](https://apptail.io/app/probability-distributions-dHP/chile)
- [Germany](https://apptail.io/app/probability-distributions-dHP/germany)
- [Italy](https://apptail.io/app/probability-distributions-dHP/italy)
- [France](https://apptail.io/app/probability-distributions-dHP/france)
- [United Kingdom](https://apptail.io/app/probability-distributions-dHP/united-kingdom)
- [Spain](https://apptail.io/app/probability-distributions-dHP/spain)
- [Canada](https://apptail.io/app/probability-distributions-dHP/canada)
- [Russia](https://apptail.io/app/probability-distributions-dHP/russia)
- [Australia](https://apptail.io/app/probability-distributions-dHP/australia)
- [South Korea](https://apptail.io/app/probability-distributions-dHP/south-korea)
- [Portugal](https://apptail.io/app/probability-distributions-dHP/portugal)
- [Thailand](https://apptail.io/app/probability-distributions-dHP/thailand)
- [Japan](https://apptail.io/app/probability-distributions-dHP/japan)
- [Ecuador](https://apptail.io/app/probability-distributions-dHP/ecuador)
- [Türkiye](https://apptail.io/app/probability-distributions-dHP/turkey)
- [Malaysia](https://apptail.io/app/probability-distributions-dHP/malaysia)
- [Netherlands](https://apptail.io/app/probability-distributions-dHP/netherlands)
- [Saudi Arabia](https://apptail.io/app/probability-distributions-dHP/saudi-arabia)
- [Sweden](https://apptail.io/app/probability-distributions-dHP/sweden)
- [Singapore](https://apptail.io/app/probability-distributions-dHP/singapore)
- [India](https://apptail.io/app/probability-distributions-dHP/india)
- [Pakistan](https://apptail.io/app/probability-distributions-dHP/pakistan)
- [Poland](https://apptail.io/app/probability-distributions-dHP/poland)
- [Romania](https://apptail.io/app/probability-distributions-dHP/romania)
- [South Africa](https://apptail.io/app/probability-distributions-dHP/south-africa)
- [Austria](https://apptail.io/app/probability-distributions-dHP/austria)
- [Azerbaijan](https://apptail.io/app/probability-distributions-dHP/azerbaijan)
- [Belgium](https://apptail.io/app/probability-distributions-dHP/belgium)
- [Belarus](https://apptail.io/app/probability-distributions-dHP/belarus)
- [Switzerland](https://apptail.io/app/probability-distributions-dHP/switzerland)
- [Czechia](https://apptail.io/app/probability-distributions-dHP/czechia)
- [Denmark](https://apptail.io/app/probability-distributions-dHP/denmark)
- [Dominican Republic](https://apptail.io/app/probability-distributions-dHP/dominican-republic)
- [Algeria](https://apptail.io/app/probability-distributions-dHP/algeria)
- [Egypt](https://apptail.io/app/probability-distributions-dHP/egypt)
- [Finland](https://apptail.io/app/probability-distributions-dHP/finland)
- [Greece](https://apptail.io/app/probability-distributions-dHP/greece)
- [Hong Kong SAR China](https://apptail.io/app/probability-distributions-dHP/hong-kong)
- [Hungary](https://apptail.io/app/probability-distributions-dHP/hungary)
- [Indonesia](https://apptail.io/app/probability-distributions-dHP/indonesia)
- [Ireland](https://apptail.io/app/probability-distributions-dHP/ireland)
- [Israel](https://apptail.io/app/probability-distributions-dHP/israel)
- [Kuwait](https://apptail.io/app/probability-distributions-dHP/kuwait)
- [Kazakhstan](https://apptail.io/app/probability-distributions-dHP/kazakhstan)
- [Lebanon](https://apptail.io/app/probability-distributions-dHP/lebanon)
- [Nigeria](https://apptail.io/app/probability-distributions-dHP/nigeria)
- [Norway](https://apptail.io/app/probability-distributions-dHP/norway)
- [New Zealand](https://apptail.io/app/probability-distributions-dHP/new-zealand)
- [Panama](https://apptail.io/app/probability-distributions-dHP/panama)
- [Peru](https://apptail.io/app/probability-distributions-dHP/peru)
- [Philippines](https://apptail.io/app/probability-distributions-dHP/philippines)
- [Vietnam](https://apptail.io/app/probability-distributions-dHP/vietnam)
- [United Arab Emirates](https://apptail.io/app/probability-distributions-dHP/united-arab-emirates)
- [Taiwan](https://apptail.io/app/probability-distributions-dHP/taiwan)
- [Latvia](https://apptail.io/app/probability-distributions-dHP/latvia)
- [Cambodia](https://apptail.io/app/probability-distributions-dHP/cambodia)

---

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