KoruPDF

KoruPDF is a Spanish PDF reader with smart word annotations. It underlines only the words you likely don't know, based on your vocabulary level. Hover for an instant translation, click for a full dictionary entry with IPA, examples and part of speech, or ask AI why the word is used in this sentence. Saved words build mastery with encounter counts, spaced quizzes and CSV/Anki export. Reading-first design with focus mask and graded sample readers. All PDF processing is local — nothing is uploaded. Free forever for reading, lookup and vocabulary; Pro unlocks unlimited AI context analysis and multi-device sync.