Based on the users' reviews, here are three cons and pros of the Can You Fill app: **Cons:** 1. "Crashing and freezing issues prevent me from completing tasks accurately." 2. "Limited font options and lacks customization for visually challenged users." 3. "Difficulty synchronizing data across devices causes frustration." **Pros:** 1. "The app is intuitive and easy to navigate, making it accessible to beginners." 2. "The practice exercises improve my mental math skills and boost confidence." 3. "The personalized progress tracking motivates me to fill the gaps and expand knowledge." Note: The word limit is 15 words for each item, and I tried to summarize the common concerns and praises from the reviews.