HSK Chinese-English Dictionary is an iPhone app designed for learning Chinese vocabulary in Hanzi and Pinyin. The app features a comprehensive English-Chinese dictionary for easy word lookup, the ability to save words for later review, and accurate pronunciation in three different accents. Users can also check the stroke order of Chinese characters, view both Simplified and Traditional Chinese, and practice with tests to assess their knowledge.

Additionally, the app offers auto-renewable subscriptions that provide benefits such as unlimited test attempts, a dark mode interface, and access to three different voices for pronunciation. Subscribers can choose between monthly and annual plans, each of which includes a free trial period for users to explore the features before committing to a subscription.