Smart Book is a bilingual e‑book reader that displays original text alongside its translation, allowing learners to acquire language through side‑by‑side reading. Users can tap any word to see instant translations from multiple services and save words to a personal library, with the option to export them for spaced‑repetition study. The app supports AI‑generated explanations, native‑speaker audio, and offers offline access and bionic reading to enhance comprehension. It works with various ebook formats and includes a free library of dual‑language stories, turning each page into a language lesson.