These are webpages that can also be accessed when offline, if they have been added to the home screen of your Android device or, in Windows, to your Chrome or Firefox bookmarks
Tap the links to install apps on your Android phone. Note that when tapping one of the links for the first time, you will be prompted to install a third-party app called Appsheet. Click here for Appsheet installation instructions on an iPhone.
These apps also function offline, except for the audio recordings.