The best alternatives to Gmelius for Gmail are Gmail, FullContact, and Moo.do. If these 3 options don't work for you, we've listed a few more alternatives below.
Gmail is a free email service developed by Google. Users can access Gmail on the web and using third-party programs that synchronize email content through POP or IMAP protocols. Gmail started as a limited beta release on April 1, 2004 and ended its testing phase on July 7, 2009.
FullContact is a privacy-safe Identity Resolution company building trust between people and brands. We provide the data + intelligence you need in your platforms to accurately identify people and optimize experiences—while putting privacy and security first.
Moo.do is the task manager for everything. By bringing all of your data into one consistent interface with a built-in email client, Moo.do keeps all aspects of your life organized.
Distinct from what Gmail uses in the browser, we designed a powerful engine that allows multiple accounts to be used together with 100% fidelity and no conflicts. It works with Google Drive, Docs, Sheets, and Slides as well.