HSK Chinese 1 to 6 is an Android-based education and reference app developed by gab.cue. This app provides an extensive vocabulary list for learning Mandarin Chinese, covering HSK levels 1 to 6. With over 1,600 verbs and QuickCards to test your knowledge of each word's meaning, writing, tones, and pronunciation, this app is an excellent resource for anyone looking to learn the Chinese language.

The app allows users to create their own list of words to practice and listen to them. However, the text-to-speech feature requires the installation of zh-CN and en-US languages on your Android device. With its user-friendly interface, HSK Chinese 1 to 6 is an ideal app for beginners and advanced learners alike who want to improve their Chinese vocabulary and pronunciation.