Based on the users' reviews of the "123 Don't Move" app, I've identified the following pros and cons: **Pros:** 1. Effective at keeping kids calm during tantrums - many parents report soothing success. 2. Simple, intuitive design makes it easy to use - even for tech-savvy toddlers. 3. Customizable sound frequencies help tailor the app to individual children's needs. **Cons:** 1. Some users find the sound effects too loud or jarring, potentially startling children. 2. Minor bugs and glitches reported by a few users, including crashes and slow loading. 3. Limited customization options for adults, such as volume control or white noise variations. (Note: These summaries are based on the 15-word limit and are meant to provide a general overview of the app's strengths and weaknesses.)