This iPhone app, "词频分级英语词汇大全," offers a curated selection of English vocabulary categorized into 5 levels based on word frequency. It covers a wide range of difficulty levels, making it suitable for all users. The app includes the complete set of secondary school English vocabulary, university-level English, as well as vocabulary for CET-4, CET-6, and postgraduate English exams.

With clear categorization and intelligent grouping, users can easily navigate through the vocabulary. The app provides real human pronunciation for each word along with detailed explanations, allowing users to mark their progress and track their learning. Additionally, users can test themselves within specific groups, with the app automatically recording incorrect answers for review. The feature to collect unfamiliar words for later viewing and the quick word search option enhance the overall user experience.