Based on the users' reviews of the Hiit Tabata Timer Simple app, here are three cons and pros: **Cons:** 1. Some users found the app's design "cluttered" and "hard to navigate", leading to a negative user experience. 2. A few users reported occasional crashes and glitches, which frustrated them during workouts. 3. A minority of users found the app's features and customization options limited, hindering their ability to tailor workouts to their preferences. **Pros:** 1. Many users praised the app's simplicity and ease of use, making it perfect for HIIT beginners. 2. The app's customizable workouts and timer features received high praise from users who enjoyed the flexibility. 3. The majority of users appreciated the app's minimalistic design, which helped them focus on their workouts. Please note that these conclusions are based on a summary of the reviews and may not reflect the views of all users.