No way to import existing Anki decks (.apkg) or Quizlet sets. Massive adoption barrier — students have years of existing flashcard collections. Anki's .apkg is a SQLite DB inside a ZIP; Quizlet allows CSV export.

Parse .apkg files, accept CSV/TSV, support export back to .apkg for portability.

Closes gap against: Anki (100M+ users), Quizlet (500M+ sets). RemNote already supports Anki import.

Effort: L