I built QuickDef because I kept losing my reading flow every time I hit an unfamiliar word, tab-switch to Google, lose context, get distracted. QuickDef solves that: highlight any word, get an instant AI definition right there on the page. No tab-switching. No copy-paste. What makes it different from a regular dictionary extension: - Context-aware AI: it reads the sentence around the word, so "bank" in a financial article gives a different definition than "bank" in a geography text - Learner-friendly output: calibrated to A2–B1 CEFR level, so it actually explains the word instead of using more words you don't know - Always works: if AI is unavailable, it silently falls back to full dictionary mode - Vocabulary builder: save words with their context sentence and build a personal word list 60+ users found it organically before I did any marketing. Building in public from here. Free to install, 10 AI lookups/day on the free tier, unlimited on premium ($3.99/mo or $29.99/yr). Would love feedback from the PH community, especially from anyone who reads a lot online in a second language. That's exactly who I built this for.

QuickDef

AI Dictionary for PDFs & English Learners

AI Dictionary for PDFs & English Learners