A 'Shiny' App to Simulate the Dynamics of Epidemic and Endemic Diseases Spread R package EpiSimR version 1.1 The 'EpiSimR' package provides an interactive 'shiny' app based on deterministic compartmental mathematical modeling for simulating and visualizing the dynamics of epidemic and endemic disease spread. It allows users to explore various intervention strategies, including vaccination and isolation, by adjusting key epidemiological parameters. The methodology follows the approach described by Brauer (2008) <doi:10.1007/978-3-540-78911-6_2>. Thanks to 'shiny' package. Software Depends: R (>= 4.1.1), shiny (>= 1.10.0), deSolve (>= 1.40), openxlsx (>= 4.2.8) Imports: dplyr, DT, shinythemes Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Nassim AYAD <nassim.ayad.ph@gmail.com> Comprehensive R Archive Network (CRAN) Nassim AYAD [aut, cre] (ORCID: <https://orcid.org/0000-0002-1809-0935>, affiliation: Laboratory of Modeling and Biostatistics, Pasteur Institute of Algeria) GPL (>= 3) 2025-02-25 application/tgz https://CRAN.R-project.org/package=EpiSimR doi:10.32614/CRAN.package.EpiSimR