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Compute probabilities, determine percentiles, and plot the probability density function for the normal (Gaussian), t, chi-square, F, exponential, gamma, beta, log-normal, Pareto, and Weibull distributions.

Compute probabilities, approximate percentiles, and plot the probability mass function for the binomial, geometric, hypergeometric, Poisson, and negative binomial distributions.

What’s New

Version 0.8

Small enhancements and bug fixes.

Ratings and Reviews

5.0 out of 5
119 Ratings
119 Ratings
jmormay ,

Super handy tool and reference

I’m a grad student and this has been a huge help for my stats class. It makes it easy to calculate probabilities using any distribution that I have needed. It got even better when I discovered that the app has easy links to formulas to calculate mean and variance for each distribution.

Roku Rob ,

Great tool for teaching stats

With Bognar’s easy to use app, I’m finally able to retire these back-of-the-book probability tables when teaching social statistics at FSU. It has everything I need: pdf, cdf, the inverse, slick graphical display, easy access to the underlying formulas, and a no-brainer menu system. Well done, Dr. Bognar, and thanks!

Kiersten D ,

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.


Matthew Bognar
2.5 MB

Requires iOS 11.4 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
You must be at least 17 years old to download this app.
Unrestricted Web Access
© 2018 Matthew Bognar


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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