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Probability Playground overview

Probability Playground lets you answer back-of-the-envelope questions by writing a simple model and instantly seeing the output distribution.

What it does​

You write a model in a mini-language — a few lines declaring random variables and derived calculations — and the playground runs 1,000 simulation iterations, then shows a histogram of the output.

Who this is for​

  • Data scientists and analysts who need quick distribution checks without setting up a full Monte Carlo environment.
  • Product managers evaluating TAM, pricing scenarios, or feature adoption ranges.
  • Engineers estimating latency budgets, failure rates, or capacity planning numbers.
  • Students and educators exploring probability concepts interactively.
tip

No account required. Authenticated users can save and reload models.

Layout​

The page has two panes:

Editor (left):

  • Text area for your model
  • Run button
  • Save button (authenticated users)
  • Error messages below the editor

Visualization (right):

  • Histogram of the last declared variable (or any variable you select)
  • Draggable Pr(x < X) line
  • Summary statistics

Next steps​

  • Core concepts — key terms and the mental model behind the mini-language
  • How-to guides — task-oriented walkthroughs
  • Reference — mini-language syntax, supported distributions and their parameters, operators, and functions