A pack holds personal words, stories, photos and recordings. It is stored only in this app on this device (not in the app files, not online). Keep a backup: “Export pack” and save it somewhere private.
Hidden words leave a blank cell; nothing else moves. Tapping a word to hide or show it switches Words shown to Custom, starting from the level you were on. L1 / L2 / L3 = the word's level (starter / middle / full). Photos come from the camera or photo library, are shrunk to 640 px and kept only on this device (they go into the pack backup when you export). Empty cells show their row/column for adding words to a pack file.
Pages are never read aloud automatically. Adding a photo to a sample story copies that story into your pack.
Off by default. When on, stores only the time and the word, in this browser's local storage. Nothing is sent anywhere.