Interactive Demo Gallery

A gallery of free, interactive statistics demos that run entirely in your browser — Shiny simulators, gtsummary table builders and a live R playground. No install, powered by WebAssembly.

Every demo below runs entirely in your browser — real R and Shiny compiled to WebAssembly, no install and no server. Click a tile to launch it. The first load fetches the R runtime, so give it a few seconds.

Boxplot of two groups

Shiny · Simulation

Two-group comparison

Move the sliders and watch a t-test react to sample size and effect size.

Statistical power curve

Shiny · Planning

Power curve explorer

How many participants do you need? See power rise with sample size.

Confidence interval coverage plot

Shiny · Intuition

What 95% confidence means

100 intervals from 100 fresh samples — watch how many miss the true mean.

PPV and NPV versus prevalence

Shiny · Clinical

Diagnostic test explorer

See how predictive values swing with disease prevalence.

Forest plot of effect estimates

Shiny · gtsummary

Table 1 explorer

Build a clinical baseline table with no code — pick variables, get the table.

Regression table illustration

webR · Editable code

gtsummary live demo

Edit real gtsummary R code and run it on clinical trial data.

Histogram of simulated data

webR · Sandbox

R playground

Run any R code in the browser — plus real biostatistics datasets to explore.

Keep going

Learn interactively

Prefer a guided path? These free courses run R live on every page:

### Learn R Vectors, data frames, plotting and your first statistics — run each step.

### Learn Quarto Reproducible reports that mix text, R code and results.

### Learn Markdown Master Markdown syntax with a live editor on every page.

These demos are the same technology we use for client dashboards — minus the server. Want one wired to your own data? That’s our Shiny practice.