Simpler is a free English learning app that offers a structured course covering grammar, vocabulary, and speaking. The app presents short grammar topics with drills and comprehension checks, and includes a flashcard library that uses spaced repetition and associative sentences. Authentic listening material voiced by native speakers and role‑play dialogues allow learners to practice pronunciation and conversational skills. Detective stories provide contextual reading practice and introduce new words while engaging users in mystery solving. Users can set daily goals and adjust a rapid‑pace mode to motivate regular practice.