While pirated PDFs exist on file-sharing sites (like Scribd, SlideShare, or Russian file hosts), the quality is often terrible—blurry scans, missing pages, or watermarked. Furthermore, distributing these files violates copyright law (3A Corporation).
| Feature | Kurikaeshite Oboeru Tangocho | Generic Anki Deck | Main Textbook Glossary | | :--- | :--- | :--- | :--- | | | High (custom-made for Chukyu) | Low (user-uploaded decks are often wrong) | Medium (just one example) | | Repetition Algorithm | Manual (you control the days) | Automated (spaced repetition system) | None | | Writing Practice | Yes (fill-in-the-blank) | No (usually recognition only) | No | | Audio Quality | Professional studio | Varies wildly | Professional | | Portability | Heavy (or PDF) | Light (phone app) | Heavy |
