A Virtual Patient Simulator in the Context of Calcium and Phosphate Homeostasis R package CaPO4Sim version 0.2.1 Explore calcium (Ca) and phosphate (Pi) homeostasis with two novel 'Shiny' apps, building upon on a previously published mathematical model written in C, to ensure efficient computations. The underlying model is accessible here <https://pubmed.ncbi.nlm.nih.gov/28747359/)>. The first application explores the fundamentals of Ca-Pi homeostasis, while the second provides interactive case studies for in-depth exploration of the topic, thereby seeking to foster student engagement and an integrative understanding of Ca-Pi regulation. Software Imports: shiny, shinyjs, shinyWidgets, shinyjqui, plotly, rintrojs, shinycssloaders, visNetwork, purrr, DT, magrittr, utils Suggests: htmltools, shinydashboard, shinydashboardPlus David Granjon <dgranjon@ymail.com> Comprehensive R Archive Network (CRAN) David Granjon [aut, cre, cph], Diane de Zélicourt [cph], Vartan Kurtcuoglu [cph], Olivier Bonny [cph], François Verrey [cph], University of Lausanne [fnd], University of Zurich [fnd], Kidney NCCR.CH [fnd], The Interface Group [cph] (Hosting Group), RinteRface [cph] (R/HTML Templates) GPL-3 2024-08-18 application/tgz https://CRAN.R-project.org/package=CaPO4Sim doi:10.32614/CRAN.package.CaPO4Sim