Newsletter Spy is a database of more than 100.000 newsletters.
Each newsletter has a title, a description, an author's name with his email address and a URL. A newsletter is written in a specific language and belongs to a category and an industry.
Newsletter Spy does als collect meta information per newsletter:
Each newsletter has number of issues. An issue can be either of type newsletter, podcast or thread. A newsletter issue has a date and an optional title. For issues of type podcast there can be also a duration with the length of the podcast.
Other meta data like Number of comments, Number of reactions and Paid ratio are not part of this exercise.