Chinese Drill

Chinese Drill is an offline smartphone replacement for flash cards, and helps the learner to learn and revise Chinese words and characters. It facilitates self-testing and automates revision scheduling on the basis of scheduled repetition.
The structure of the levels and lessons correlates with the official learning material for the HSK 2.0 tests at Level 1, and so the app can be used as a companion to the appropriate books. The coverage can be extended up to HSK (2.0) Level 6 by an in-app purchase.
Additionally, Chinese Drill allows the user to enter own words and characters (requires Chinese soft keyboard if entering Chinese characters).
The app works entirely offline and does not require an internet connection for anything except app updates and the In-App Purchase.