Designed for both iWatch and iPhone, this little flashcards app helps you memorize Chinese characters quickly and efficiently. Completely free and open-source:

https://github.com/alexeyismirnov/lanternhsk

The app provides a brief description for each character in HSK1 - HSK6 lists. Custom (user-generated) lists are also supported.

You can do a search in HSK lists and your custom lists as in a dictionary.

To improve learning efficiency, users can also do various exercises, such as:

- Translating characters
- Drawing character tones
- Typing pinyin or characters

Supports Traditional and Simplified characters.