How hard is this book to read?

Drop in an EPUB or a plain-text file to see its reading grade, how varied its vocabulary is, and how many distinct words you need to follow most of it.

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total words

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unique words

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vocabulary richness (TTR)

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reading ease, 0 to 100

The 20 most frequent words once stopwords are removed.

How much of the whole book the most common words cover.

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What the numbers mean

Reading grade: Flesch-Kincaid: the US school grade a reader needs, from words per sentence and syllables per word.
Reading ease: Flesch reading ease, 0 to 100; higher is easier.
Richness (TTR): Unique words divided by total words. Lower means more repetition, and it falls as a text gets longer.
Coverage curve: How few distinct words you need to follow most of the book. I used the same measure on reality TV in the Love Island lexical analysis.