Based on the users' reviews of the "Vocabulary Builder 9" app, here are three pros and cons in English, 15 words limited for each item: **Pros:** 1. **Effective learning tool**: Users praise its ability to improve vocabulary retention and provide personalized practice sessions. 2. **Engaging and fun**: The app's gamification features and diverse exercises keep learners motivated and entertained. 3. **Comprehensive dictionary**: The app's dictionary offers a vast range of words, with accurate definitions and examples. **Cons:** 1. **Buggy design**: Some users experience crashes, errors, or glitches that disrupt the learning experience. 2. **Limited free content**: The app requires subscription or in-app purchases for full access to vocabulary lists and quizzes. 3. **Not customizable enough**: Users request more flexibility in setting preferences for word types, difficulty levels, and practice routines. Please note that these points are based on a general analysis of the app's reviews and may not reflect the opinions of all users.