Volume 2 currently supports the most popular languages for English speakers:

| Feature | Official Refold Decks | Community Shared Decks | | :--- | :--- | :--- | | | Often Free (for basic versions) or Paid (premium features). | Usually Free. | | Quality | High quality (audio, sentence lookup). | Variable. Some are excellent; others have errors. | | Content | Based on frequency lists or generic media. | Often based on specific TV shows or books. | | License | Fully licensed and legal. | Often "grey area" (using copyrighted audio without permission). |