LanguageShelf

Language Shelf is a vocabulary learning note taking app specially geared towards learning new vocabulary encountered while reading books.

Main Functionalities
The app is made up of three main tabs:

Bookshelf Tab
Once signed in, the bookshelf tab shows a list of all of the user's bookshelves.
The user can add, delete, rename, and add a cover image to a bookshelf.
Inside a bookshelf, the user can add books.
The user can add, delete, edit book information, and add a cover image to a book.
Inside a book, the user can create vocabulary (word, definition, notes) and sentence (example sentence) entries.
The user can link related vocabularies and sentences together.
The user can click on a vocabulary entry, which will bring up a definition from a Dictionary API if available.
The user can add, delete, and edit vocabulary and sentence entries.
All bookshelves, books, vocabularies, and sentnces are ordered in alphabetical order.

Game Tab
The game tab is where the user can have fun while learning vocabularies
Upon starting the game, five random vocabulary cards and their matching definition cards are shown on the screen.
The user taps on two matching cards to make them disapear.
The game completes upon all cards disappearing.
At the end of a game, a result screen shows the game result and some user statistics.

User Profile Tab
The user can also change the theme of the app on the user profile tab.
If not signed in, the profile tab shows the sign in or sign up views.