Book in. Vocab out.

Drop in a book and get back the words actually worth learning — not everything in it, just the vocabulary that's new to you.

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Skip what you already know frequency band

Every word is checked against a real-world frequency list for the book's language. Hide the top 1000 most common words (you already know them) and cap the rank ceiling so words too rare to bother with drop out too — leaving the vocabulary sweet spot for your level.

One entry per real word lemma counting

Inflected forms collapse into one entry — Spanish habló, hablas, and hablando all become hablar — so the list reflects real vocabulary items, not every conjugated or declined form counted separately.