Here's a tool you can use to quickly check the readability of any website or blog. You can also use it to do a deeper analysis of any text. Just enter the web address or paste in the text, and in addition to a readability index, you will get all kinds of interesting information, like
Number of different words used in the text
Average number of syllables per word
Average sentence length
10 most frequently used words
Most frequently used two-word expressions
Check it out: Textalyzer.
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