Fork of count_pages plugin for Calibre with additional features and download sources. Original plugin can be found here.
- Added OBI reading difficulty evaluation which is based on these papers:
- 日本語テキストの難易度判定ツール『帯』
- Automatic Assessment of Japanese Text Readability Based on a Textbook Corpus
and available as a web service here
- Added additional page count download sources; Amazon, AmazonJP, Google