Kindle Direct Publishing

Kindle Direct Publishing (KDP) is a self-publishing platform that allows authors to publish eBooks and print books. While it doesn't offer a rich text editor in the same way Medium does (it's more about uploading formatted manuscripts), it does provide tools for authors to earn royalties (membership-monetization) and offers reports on sales and pages read (reader-engagement-metrics). It also supports author pages (user-profiles-and-following), categories/genres (tags-and-topics), and marketing tools including email newsletter integration and social sharing. The platform is primarily for publishing and distribution, and while it has a search function for books, it doesn't have a dynamic recommendation engine like Medium's content feed.