I'm planning a lot more work in this area, including server-side filter configuration, Google Drive support, G Suite directory autocomplete, and more. Mimestream differs from other email clients because it uses the Gmail API rather than IMAP, so it supports more Gmail-specific features like categorized inboxes, Gmail's search operators, first-class labels support (apply multiple via ⌘L, set colors, etc), synced aliases, synced signatures, etc. Mimestream's advantages over using the Gmail web interface includes features like multiple accounts, a unified inbox, system notifications, swipe actions, dark mode, (some) offline support, tracker prevention, multiple keyboard shortcut sets, and more. It's designed to be fast, lightweight, and use a minimal amount of disk space.

Mimestream is written in Swift, and uses AppKit+SwiftUI for a clean, stock appearance.

Hi HN! In the past, I spent over 7 years working on Apple Mail, and today I am really excited to share a new email client I'm building: Mimestream, a native macOS email client for Gmail.