Based on the user reviews of Fast On Lines app, here are three cons and pros with 15-word limits for each: **Cons:** 1. "Sometimes the app crashes or freezes, causing frustration and lost progress." 2. "Notifications can be overwhelming and hard to customize, leading to annoyance." 3. "Lack of customization options for drawing and painting styles is disappointing." **Pros:** 1. "User-friendly interface makes it easy to navigate and create art quickly." 2. "High-quality results and realistic color palette make designs stand out visually." 3. "Innovative collaboration features allow real-time sharing and feedback with others effortlessly." Please note that these conclusions are based on the user reviews available on the Apple App Store at the time of my knowledge cutoff, and may not reflect the entire range of user opinions or the app's current version.