Native macOS Gmail client that uses Google's API in order to provide you with the Gmail features you know and love, all in an efficient Swift-based app
What's new in Mimestream 0.29.1:New: Links and attachments now have an "Open With" context menu item Preference for a default composing font
Email clients that support Gmail aren't exactly rare, but the vast majority of them use the IMAP protocol to retrieve and manage your messages, which means they can't take advantage of Gmail-specific features such as inbox categorization, labels, and synchronized signatures.
Mimestream goes about it differently — it uses the Gmail API, allowing it to provide most, though not quite all, of the features you are familiar with from Google's mail client. It's also worth noting that the app is written in Swift, so it will integrate very well with macOS and provide a much smoother experience than, for instance, an Electron-based app.
Most of the well-known Gmail features on your desktop
Whenever I try to manage my Google mail account with anything other than Gmail, the one thing I miss the most is email categorization. Without it, my Inbox is flooded with promotional and social-media-related messages that I'm very much not interested in.
With Mimestream, you get all of this functionality and a lot more. Your aliases are also synced automatically, as are your signatures, and you can take full advantage of Gmail's labeling system.
Of course, not all Google mail features are available using Gmail's API. For instance, you cannot snooze emails, but given everything else that the app can do, this is a very minor issue.
A very swift Swift-based app
You've probably used an Electron app before, and it's difficult not to notice how sluggish most of them are, while also not integrating well with the OS, and sometimes even looking out of place.
There are no such issues with Mimestream. It is written in Swift, making it much more resource-friendly and fast, in addition to integrating perfectly with macOS and supporting a wide range of keyboard shortcuts for managing your mails.
Free while in Beta, with more features on the way
If this app has sparked your interest, you may want to give it a try as soon as possible, as it will only be free during the Beta testing period. In any case, whatever the final price will end up being, it's difficult to argue that it's not worth the money.
Even more features are planned for future releases, such as the option to unsubscribe from mailing lists with a single click, as well as easily configurable vacation responses.
In short, if you use Gmail and happen to own a Mac, you have absolutely no reason not to grab Mimestream. It is infinitely better than using Apple Mail to connect to your Google account since it uses the Gmail API, and it integrates perfectly with the OS thanks to being written in Swift.
LIMITATIONS IN THE UNREGISTERED VERSIONThe application is free during the Beta period