This page hosts the R code underlying the power analysis app distributed with the following paper:

Judd, C. M., Westfall, J., & Kenny, D. A. (2016). Experiments with more than one random factor: Designs, analytic models, and statistical power. Annual Review of Psychology.

A live version of the app can be found here.

This code relies on the Shiny library. To run the app locally, you will need to download the R script files, install the Shiny library, and point Shiny to the R scripts. A nice tutorial can be found here.