This is a neat trick I found on Tyler Morgan-Wall’s Twitter and is originally attributed to Joe Cheng. You can run any Shiny app without blocking the session. My helper function to run ShinyStan without blocking is below: launch_shinystan_nonblocking <- function(fit) { library(future) plan(multisession) future( launch_shinystan(fit) #You can replace this with any other Shiny app ) } Hope that helps!