Chinese ExerciseBookFlat is an Android application designed for Mandarin teachers or parents to help their students or children practice writing Mandarin characters. The app features a vocabulary writing practice, calligraphy, and sophistical writing exercises, and it also integrates a Chinese dictionary function.

With the latest version 2.2.1, the app is now compatible with Android 12.0 and has added a quick search Chinese Book vocabulary feature, including certification tests for Chinese language such as TOCFL, HSK_2020, and HSK_2012. The app also allows users to switch between traditional and simplified Chinese characters and has added a phrase up to four characters feature. Additionally, the app has fixed solid character restriction with Kai font BUG and the oversized font size BUG.

Overall, Chinese ExerciseBookFlat is a comprehensive and useful app for anyone looking to practice writing Mandarin characters.