Engoro uses spaced repetition science to make English vocabulary stick — not for a week, permanently.
Free forever · No credit card required
Three steps. Five minutes a day. Vocabulary that lasts a lifetime.
See the science behind itSee English words with pronunciation, context sentences, and usage examples. Each word is introduced at the right moment in your learning path.
Our FSRS-5 algorithm calculates exactly when you're about to forget each word — and sends you a review right before that moment. No wasted reviews.
Each successful review exponentially increases the time until your next review. After 4–5 sessions, the word moves into long-term memory — yours forever.
Based on open benchmarks from the FSRS research project. Read the research →
Engoro is powered by FSRS-5, an open-source spaced repetition algorithm developed by researchers and validated across millions of real reviews.
It outperforms traditional systems like SM-2 — the algorithm behind Anki — in independent benchmarks, with measurably higher retention at every time interval.
Read the FSRS-5 research paperFree to start. Takes 5 minutes a day.
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