Based on the users' reviews of the "Quiet Library" app, here are three cons and pros in English, limited to 15 words each: **Cons:** 1. "App kept crashing and freezing, frustrating experience." - User frustration with app stability. 2. "No bookmarking feature, forced to re-scroll through pages." - User disappointment with missing bookmarking. 3. "Limited filtering options, hard to find specific books." - User difficulty in finding specific books due to limited filters. **Pros:** 1. "Clean and intuitive design, easy to navigate." - User appreciation for app's clean design and navigation. 2. "Large collection of free e-books, great resource." - User enthusiasm for the app's large collection of free e-books. 3. "Syncs across devices, convenient reading experience." - User convenience with app's cross-device syncing feature. Please note that these conclusions are based on the reviews available on the Google Play Store as of my knowledge cutoff. Reviews can change over time, and more reviews may not reflect the same sentiments.