Frázová Slovesa trial is a mobile application developed by Apps4English for Android devices, designed to help users learn and practice English phrasal verbs. The app uses an intelligent repetition method to facilitate learning, analyzing mistakes made during practice sessions and displaying problematic questions more frequently than those already mastered. The trial version offers six free sample lessons, while the full version includes 68 lessons with 570 of the most common phrasal verbs.

The lessons are divided into sections, each containing approximately 10 questions, and users can choose which lesson or question they want to start learning. Learning can be paused or restarted at any time, and the app provides overall summaries, graphs, and statistics on individual questions. Each answer includes examples of how the expression can be used for easier memorization. The app uses a sophisticated algorithm based on the spaced repetition technique for effective learning, displaying problematic questions more frequently and with longer intervals over time. The content of the lessons and individual questions is regularly updated and supplemented, and the app's design is optimized for both phones and tablets.