Readu rewrites timeless literature into graded editions matched to your vocabulary — so you read with 2–5% new words, understand every page, and keep going.
2%~5% new words · 30 min/day · 14-day cycle
Three numbers that turn reading into real language growth.
Pick books at about 2–5% new words. If you understand it, you can keep reading — and that's where growth happens.
A small, steady daily dose of input keeps the vocabulary and sentence patterns flowing in.
Read one author for a two-week cycle and the new-word rate drops naturally — narrow reading at its best.
Built around comprehensible input — the single most reliable path to fluent reading, listening, speaking and writing.
Public-domain masterpieces rewritten at fixed vocabulary ceilings, labeled with their true measured level.
A two-stage adaptive test estimates your reading vocabulary, then matches books to your i+1 level automatically.
Smart recommendations by the same author or theme keep the new-word rate dropping as you progress.
Streaks, heatmaps, minutes and micro-outputs — see your input add up and reading become a habit.
Text-to-speech for a page, a chapter, or the whole book — train your ears while you read.
Tap any word for an English-English definition, or double-tap to mark it known — no dictionary-diving required.
You acquire language when you understand messages slightly beyond your current level. Readu keeps every book just at that edge — understandable, but still growing.
Ditch the dictionary, skip what you don't get, and switch books that don't fit. Fluency first — the vocabulary internalizes itself through context.
Start free. Upgrade when you're ready to read the whole library.
Save 50% with the yearly plan — $29.99/year.
Subscribe on the web — your Pro account works across the app on every platform.
Invite friends from inside the app. When they subscribe you earn free VIP time, and they get 20% off their first Stripe purchase.
iOS, Android, Windows and macOS — your progress follows your account.
A graded edition is a classic rewritten at a fixed vocabulary ceiling (1000–3000 words). Readu measures each book's real level, so the "Level X words" label is a readability guarantee, not a guess.
Take the built-in vocabulary test (about 1–2 minutes). Readu then matches every book to your i+1 level automatically.
Reading several books by the same author or on the same theme. Recurring vocabulary makes each next book easier — the new-word rate drops naturally.
Yes. Cancel in one click and keep Pro until the end of your billing period.
iOS, Android, Windows and macOS. Subscribing here on the web unlocks the same Pro account everywhere.