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How we measure the real CEFR level of a book, and where it still fails

Most graded readers have a level printed on the cover. Almost nobody can tell you how it was decided. We publish free books at books.dev , each in the original English and many in simpler editions, and we wanted a number on every edition that we could defend. Here is how our meter works today, how…

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  1. 2026-11-03 21:40 · DEV Community — Machine Learning
    How we measure the real CEFR level of a book, and where it still fails

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