Booklern shows every page of an English book twice: the original English text, and right below it, its translation, aligned sentence by sentence. You read the English; the translation is there the moment you need it, and stays out of the way when you don't.
Open a book and each page is translated the first time anyone reads it, then cached. Pages you revisit load instantly and cost nothing. Hover any word and the matching phrase lights up in both languages, so you always see what maps to what. A built-in dictionary explains individual words without leaving the page.
Natural AI voices read each passage aloud, highlighting words as they are spoken. Then you can read the same passage yourself: the app listens and colors every word by how confidently it was recognized, which is instant pronunciation feedback. Your recordings are never stored.
Save a word with one click while reading. Once you have collected a few, the app writes a short practice story that uses your saved words, so you meet them again in a new context, the way vocabulary actually sticks.
Upload any English EPUB or paste any text. It becomes a bilingual book with all the same features, private to your account.