Gmail vs Roundcube: What are the differences?
Gmail: A free web-based e-mail service. An easy to use email app that saves you time and keeps your messages safe. Get your messages instantly via push notifications, read and respond online & offline, and find any message quickly; Roundcube: A web-based IMAP email client. It is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an email client, including MIME support, address book, folder manipulation, message searching and spell checking.
Gmail and Roundcube can be primarily classified as "Email Marketing" tools.