The first step in downloading a rummy app is to go to the app store on your device, which is the Apple App Store for iOS users or the Google Plsatta.king onlineay Store for Android users. Once there, type "Rummy" or "Rummy app" into the search bar. When a list of applications becomes available, take your time reading reviews and ratings to determine which one best fits your needs. Click the download button after choosing an app that you like.