KITABOO

KITABOO is a strong match for the online publishing platform concept. It offers a comprehensive suite of tools for content creation (including conversion from PDF/InDesign to reflowable ePub, which implies a rich text editing capability for the resulting content), distribution, and engagement. While it doesn't explicitly mention a 'recommendation engine' in the same way Medium does, its focus on content distribution and analytics suggests mechanisms for content discovery. It provides detailed analytics, supports community feedback through annotations and highlights, and allows for publication management. The platform also offers user profiles, tagging, mobile app access, social sharing, and search functionalities. The primary difference is its target audience, which is publishers and institutions rather than individual writers, and its monetization model is focused on B2B sales rather than a direct reader subscription model like Medium's.