What are some alternatives?
When comparing Kiwi for Gmail and Airmail, 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!
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Postbox - The Power Email App for busy professionals, like you.
Mailplane - Mailplane is the best way to use Gmail on your Mac. Use an unlimited number of accounts, get new mail notifications, use plug-ins and much much more.