Learn English by reading stories you actually enjoy. Tap any English word and see what it means in that exact sentence, explained in your own language. Save it in one tap, and SUFX brings it back for review right before you'd forget it.

Sound familiar? You stop at every unknown word, lose the thread and close the book. You learn word lists and forget them a week later. SUFX turns that around: you read real English, you understand every word, and you keep the new English words because they come from stories you love, not from a list.

ENGLISH STORIES AT YOUR LEVEL
• Dozens of English stories, mostly world-famous classics, each in three versions: A2, B1 and B2. They work like graded readers, with a twist: finish the easy version, then read the same story one level up and feel how far you've come.
• Ready to go beyond graded readers? Read free classic books in the original, sorted by genre and difficulty.
• Your own books too: open EPUB, FB2 and TXT files with the same tap-to-understand dictionary.
• A calm reader with themes, fonts, text size and layout settings.

LISTEN AND READ ALONG
• Classic audiobooks read by real human voices, not a robot. A gentle way into English listening: find them with the "With audio" filter.
• The sentence being read lights up, the current word is underlined, and the pages turn by themselves.
• Change the speed, skip 15 seconds back or forward. It's English listening practice where you never get lost, because the text is always right in front of you.

AN ENGLISH DICTIONARY THAT READS THE SENTENCE
• "Fine" in "a fine day" is not "fine" in "pay a fine". SUFX looks at the sentence, finds the right form and part of speech, and shows the meaning that fits.
• Hold a word to translate the whole sentence, or ask the AI tutor about grammar and meaning.
• A detailed English dictionary: meanings with examples, US and UK pronunciation with IPA and audio, CEFR level, frequency, word forms, collocations, synonyms and their nuances, phrasal verbs, register and etymology.
• Words like "get" and "take" show their phrasal verbs on a tab of their own, with meanings and examples.
• Only know the word in your own language? Type it in and get English options (within a daily limit).

YOUR VOCABULARY BUILDER
• Save words straight from the page in one tap. SUFX remembers which book each one came from, so your vocabulary builder grows from your own reading, not from random lists.
• Short spaced-repetition reviews with flashcards and fill-the-gap exercises bring every word back at the right moment.
• Watch each word grow from New to Fragile, Growing, Stable and Mastered. Track your reading time, streak and progress.
• Word collections, including the NGSL list of the most frequent English words, plus your own lists and notes.

SAY IT, WRITE IT
• "How to say it?": write a thought in your language or in English and get natural English, other ways to say it and a short explanation. Ask for a version that's more polite, more casual, shorter or right for work.
• Essay feedback: write a short essay and get AI scores, your mistakes marked and corrected, and the words to learn next.

IN YOUR LANGUAGE
The app is available in English, Русский, Українська, Deutsch, Español, Français, Polski and Türkçe, and word explanations come in your own language.

WHO IT'S FOR
Learners from A2 level up who want to learn English from real books, not just word games.

FREE AND PREMIUM
SUFX is free to download and use, with daily limits. Premium gives you much higher daily limits for translations, new words, AI questions, essays and "How to say it?" phrases. It also explains every mistake in your essays and adds intensive review and your own reader colors. New subscribers can start with a 7-day free trial. Subscriptions renew automatically. To manage or cancel yours, open Google Play → Payments & subscriptions → Subscriptions.

Questions? Visit https://sufx.app/support or email support@sufx.app.