NewCompleteMaster N1 Word Book is an educational app designed for Android users, focusing on vocabulary acquisition for the Japanese Language Proficiency Test (JLPT) N1 level. The app features a collection of 2,200 essential words, categorized by part of speech, allowing learners to efficiently memorize vocabulary in manageable blocks of around 25 words. Users can listen to audio pronunciations to enhance their learning experience and track their progress by marking words they have learned.

In addition to vocabulary practice, the app includes 16 reading passages, each approximately 600 words long, which users can read while listening to the audio. The app offers customizable settings, including options to toggle phonetic readings of kanji and translations on or off, as well as an auto-play feature for audio content. While the audio resources are free, displaying translations incurs a charge, making this app a versatile tool for serious Japanese language learners.