Built a free web tool (fastvoc) that generates flashcards from PDFs in seconds

Quick context: Manual flashcard creation was taking up way too much of my study time, so I coded a free tool called fastvoc (https://fastvoc.app) to automate the process. How it works: Drop in your study materials, lecture slides, or vocabulary lists. fastvoc instantly extracts the core terms and creates an active-recall deck. Review cards using spaced repetition (SM2 algorithm) to lock them into long-term memory. It's 100% free (no paywall/subscription required right now) because I'm looking for student feedback to make it better. Check it out at https://fastvoc.app and let me know if you run into any bugs or have feature ideas!