This modeling and simulation tool can help high school and undergraduate chemistry and physics students develop a deeper understanding of ideal and real gas laws. The app has a database of gas properties for 76 gases, including elements, inorganic compounds, hydrocarbons, and organic compounds. Students can manipulate the temperature, volume, or the number of moles of a selected gas. The simulator then computes the pressure for the selected variable, using three different gas models: the ideal gas model, the van der Waals real gas model, and the Peng-Robinson real gas model. Results appear in both graphs and tables. The User Guide includes screenshots of results from different simulations, giving students a clear picture of the kind of data available from the app.