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Probability-Distributions

Probability-Distributions

by Matthew Bognar

190 ratings
68 reviews
📚 Education
Free

Details

  • Released
  • Updated
  • June 22, 2014
  • July 13, 2025

Developer

Matthew Bognar
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About

Calculate probabilities, find percentiles, and visualize probability density or mass functions for a wide range of continuous and discrete statistical distributions. Explore common distributions like normal, binomial, Poisson, and many more.

✓Compute probabilities
✓Determine percentiles
✓Plot probability density function
✓Plot probability mass function
✓Supports 10+ continuous distributions
✓Supports 5+ discrete distributions
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What users say

Summarized from real user reviews of Probability. Based on 190 reviews and a 4.9/5 average, it highlights the 8 positives and 2 negatives reviewers mention most about this Education app.

Positive things

  • 👍Easy to use interface
  • 📊Great for probability distributions
  • 💡Useful for checking work and homework
  • 💰Free advanced functions
  • 📈Visualizes data and distributions
  • 🚀Quick calculations
  • 📚Valuable educational tool
  • 💯Accurate results

Negative things

  • 🚫Not allowed on some exams
  • 🤔Some users want more features
See all reviews

What's New in Probability

0.9.3

July 13, 2025

Small UI changes. Updated Boost numerical library.

User reviews

Most RecentHighest RatedLowest Rated

Good for education but needs improvement

As a teacher I need exam mode such as Geogebra to use during exams
Flor93.Flor93.

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.Uh, your Mom.

look what it pooped out

absolutely love this man, great for checking work and giving hints to solutions!
J_KindleJ_Kindle

Sick App

I love probability distributions.
JuniorlaggersJuniorlaggers

Wow just wow.

I met my wife because of this app. Needless to say I’m not happy and it’s this apps fault.
sam_eyesam_eye
See 63 more reviews

User experience

✨

Requested Features

7 requests

Exam mode similar to Geogebra

Feature

Poisson distribution

Feature

Allow setting plot boundaries (e.g., for Beta distribution)

Feature

Make formulae available in offline mode

Feature

Clearly introduce parameters

Feature

Add options after graph rendering (area above, between, outside values)

Feature

Consistent terms for df across distributions

Feature

FAQ

What does this app do?

This app allows you to compute probabilities, determine percentiles, and plot the probability density or mass functions for a variety of common statistical distributions. It covers both continuous and discrete probability models.

What statistical distributions are supported?

The app supports over 10 continuous distributions including normal (Gaussian), t, chi-square, F, exponential, gamma, beta, log-normal, Pareto, and Weibull. It also supports 5+ discrete distributions like binomial, geometric, hypergeometric, Poisson, and negative binomial.

Is this app free to use?

Yes, the application is completely free to use. There are no in-app purchases or advertisements, providing an uninterrupted experience for all users.

Who would benefit from using this app?

This app is ideal for students learning statistics, researchers analyzing data, statisticians performing complex calculations, and anyone who needs to understand or visualize probability distributions in their work or studies.