Based on the users' reviews of Master Blocker on the Apple App Store, here are three cons and pros: **Cons:** 1. Some users find the app's functionality limited, with too many ads and not enough customization options. 2. Users report experiencing frequent crashes and errors, frustrating their experience with the app. 3. A few users feel that the app's design is not user-friendly or visually appealing, making it hard to navigate. **Pros:** 1. Reviewers praise the app's effectiveness in blocking distracting websites and apps, promoting focus and productivity. 2. Users appreciate the app's simple and intuitive interface, making it easy to use and set up. 3. Many users value the app's ability to track screen time and set time limits, helping them develop healthier digital habits.