countdown makes it easy to drop in a simple countdown timer in slides and HTML documents written in R Markdown.

library(countdown)

countdown(minutes = 0, seconds = 15)

Check out countdown in its native environment in the countdown presentation.

You can install countdown from CRAN

install.packages("countdown")

or you can install the development version of countdown from gadenbuie.r-universe.dev

options(repos = c(
  gadenbuie = 'https://gadenbuie.r-universe.dev',
  getOption("repos")
))

install.packages('countdown')

or from GitHub

# install.packages("remotes")
remotes::install_github("gadenbuie/countdown", subdir = "r")

countdown ships with a Shiny app for an interactive full-screen countdown timer!

To launch the app, run

countdown_app()

or use the version hosted online at apps.garrickadenbuie.com/countdown.