Polymail is an email application for OS X and iOS known for its clean interface and additional features atop the Gmail platform. Developed by Polymail, Inc.
License: Freemium
Polymail is designed for users who prioritize email tracking, collaboration, and third-party integrations, making it ideal for teams and productivity-focused individuals. eM Client, on the other hand, excels in offline functionality and a comprehensive set of email management tools suitable for individual users who need a robust email client with calendar and task integration.