Based on the users' reviews of the PiPA Tuner app, here are three cons and pros in English, limited to 15 words each: **Cons:** 1. Some users found the app's user interface cluttered and confusing, making it difficult to navigate. 2. A few reviewers experienced issues with the app's accuracy, citing pitch deviations and frequency errors. 3. A small number of users reported crashes and bugs, which disrupted their practice sessions. **Pros:** 1. Many users praised the app's ease of use, saying it was intuitive and simple to operate, even for beginners. 2. Reviewers appreciated the app's advanced features, such as fine-tuning and pitch tracking, which helped improve their tone. 3. Many users commended the app's high-quality sound samples, saying they helped develop and refine their skills effectively.