Based on the user reviews on the Apple App Store, here are the cons and pros of the "Hyakunin Isshu Karuta" app: **Cons:** 1. Users complain about the app's lack of customization options and limited settings. 2. Some reviewers experience bugs and crashes, especially when using the app's card-deck feature. 3. A few users find the app's instructions and interface hard to understand, leading to frustration. **Pros:** 1. Users praise the app's extensive library of Japanese cards, including advanced filters and search functions. 2. Reviewers appreciate the app's ability to learn and practice the popular Japanese card game, karuta, at their own pace. 3. Many users commend the app's beautiful graphics, animations, and overall design, making it a visually appealing experience. Let me know if you'd like me to help with anything else!