It uses the Udemy API to retrieve additional information about the courses in your library and adds the following elements to each course:
- The total runtime
- The rating
- The total number of ratings
- The number of enrolled students
- The date of the last update
- Info about available subtitles
Additionally it displays a thin colored strip at the bottom of the course card, from red (3.5 stars and below) to green (5 stars).
This should give you a good idea of which course is worthwhile and which you might want to archive instead.
Note: If a course has stopped enrollment and is no longer publicly visible, no stats are available for that course.