RStudio Server: RStudio, a widely used integrated development environment (IDE) for R, offers a server version that can be set up on a remote machine or cloud server. You can access R and RStudio through a web browser on your iOS device.
Third-Party Apps: There are a few third-party apps available on the App Store that provide limited R functionality. These apps may allow you to write and run R scripts, but they are not as feature-rich as the desktop version.
Jupyter Notebooks: You can use Jupyter Notebooks with R kernels to run R code on iOS devices. Jupyter Notebook is available as an app on iOS and supports multiple programming languages, including R.
R Download for iOS
It's important to note that while these alternatives offer some level of R functionality on iOS, they may not provide the same experience as using R on a desktop or laptop computer. Additionally, the availability of apps and solutions may have evolved since my last update in January 2022, so I recommend checking the App Store or relevant forums for the most up-to-date information on R-related tools for iOS.