SUFX: Learn English by Reading

Read real English and understand every word.
Tap any word in a story and see what it means in that exact sentence, explained in your own language.
Save it in one tap, and SUFX brings it back right before you'd forget it.

Sound familiar? You open an English book, stumble over every third word and give up by page five. Or you learn word lists and lose them a week later. SUFX turns that around: you read stories you actually enjoy, and the new words stay with you because they come from a story, not a list.

STORIES AT YOUR LEVEL
• Dozens of stories, mostly world-famous classics, each at three levels: A2, B1 and B2. Start where it feels comfortable, then read the same story one level up and feel how far you've come.
• Free classic books in the original, sorted by genre and difficulty.
• Your own 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. 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. Your ears and eyes learn together, and you never lose your place.

A DICTIONARY THAT READS THE SENTENCE
• "Fine" in "a fine day" isn't "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.
• Every entry goes deep: 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.
• Only know the word in your own language? Type it in and get English options (within a daily limit).

WORDS THAT STICK
• Save words straight from the page in one tap. SUFX remembers which book each one came from.
• Short spaced-repetition reviews with flashcards and fill-the-gap exercises bring every word back at just the right moment.
• Watch each word grow from New to Fragile, Growing, Stable and Mastered. Keep an eye on your reading time, streak and progress.
• Ready-made collections, including NGSL, the most frequent English words, plus your own lists and notes.

SAY IT, WRITE IT
• "How to say it?" turns a thought written in your language or in English into natural English, with 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 with corrections, 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.

Made for learners from A2 level up who want to read real English, not just play word games.

FREE TO START, PREMIUM TO GO FURTHER
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?", explains every mistake in your essays, and adds intensive review and custom reader colors. New subscribers can start with a 7-day free trial. Subscriptions renew automatically and can be managed or canceled in your App Store account settings.
Terms of Use: https://sufx.app/terms-of-service
Subscription Terms: https://sufx.app/subscription-terms
Privacy Policy: https://sufx.app/privacy-policy

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