Vocabulary
Each chapter's words become review cards you rate yourself — no separate flashcard app to manage.
The words and phrases in each chapter become review cards. You rate how well you knew each one, and the ones you find hard come back more often — spaced repetition, built in, with no deck to assemble.
Because the cards come straight from the chapter you studied, the vocabulary you review is the vocabulary you actually read, heard and said — not a generic frequency list.