What are some alternatives?
When comparing Kiwi for Gmail and Mailbird, you can also consider the following products
Shift - Shift is the ultimate email client for managing Mail, Calendar, Drive, Slack, Asana, Jira, Evernote, and all your other favourite apps
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
eM Client - eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.
Postbox - The Power Email App for busy professionals, like you.
Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.