Based on the user reviews, here are three cons and three pros of the Calculator X app: **Cons:** 1. Limited memory storage: Users complained that the app lacks a memory storage feature, limiting its functionality. 2. Ads are intrusive: Several users mentioned that the app displays ads that are too frequent and intrusive. 3. Lack of compatibility: A few users reported issues with the app not functioning properly on certain devices or operating systems. **Pros:** 1. Intuitive interface: Users praised the app's clean and intuitive design, making it easy to use and navigate. 2. Advanced scientific calculations: Reviewers appreciated the app's advanced scientific calculations capabilities, including trigonometry and hyperbolic functions. 3. Free and ad-free version available: The app offers a free version with minimal ads, making it a great option for those on a budget.