Here are the most prominent features of the iStoria Premium subscription for English language development, briefly and point-wise: * Unlimited Learning: Read and listen to unlimited chapters and stories daily (unlike the free version limited to only 3 chapters). * Ad-Free Experience: Browse and read with full concentration without any annoying interruptions or ads. * AI Pronunciation Assistant: Feature to read stories with artificial intelligence to correct pronunciation and improve speaking skills. * Interactive Conversations (iStro): Ability to discuss story content and chat with the AI assistant to develop dialogue skills. * Background Listening: Play audio and listen to stories and books even when exiting the app or turning off the screen. * Comprehensive Skill Development: Activate intensive exercises for all skills (reading, listening, writing, dictation, and pronunciation) instead of just reading. * Navigation Flexibility and Level Skipping: Ability to skip stories or levels to customize the learning path according to your current skills. * Full Sentence Translation: Instant translation of words and sentences within stories (available up to level four to support beginners). * Customize Dictionary: Ability to add custom external words to your vocabulary lists for later review. * Achievement Certificates: Receive digital certificates upon completing and mastering educational levels.