Here’s a great tool for determining the readability level of a Greek text. Enter part of a text and the tool will give you a graph of the text level.

It also gives a detailed analysis including:

• number of words
• number of easy words
• number of difficult words
• number of words with prefixes and suffixes

The tool is on the website of the Κέντρο Ελληνικής Γλώσσας:
https://www.greek-language.gr/certification/readability/index.html