Hard to answer your question without hijacking the thread, but here goes:

• It's got pretty much all the power features out there like Snoozing, Open Tracking, Send Later, Reminders, Enriched Contacts (i.e. Rapportive), Unified Inbox, Swipe Actions, Templates, etc.

• It's open source and super easy to extend with JavaScript plugins. Developer have made dozens of themes and some cool plugins including PGP, Unsubscribe, Translation, Todoist, Trello, Markdown, etc.

• It's cross-platform for Mac, Windows & Linux with custom UI styles for each.

• It works with all mail providers including Gmail, Yahoo, iCloud, Outlook and even vanilla IMAP and on-prem Exchange servers.

• It syncs your data directly (not via a cloud service) for speed and security.

• It works offline, so you can use it on a plane or when you don't have WiFi.

• It's open source GPL available on GitHub with >20k stars: https://github.com/nylas/nylas-mail

• It's free.

It's also still improving and has over 800 GitHub issues and we would love help from anyone who wants to make email better! :)

There are other comments in here comparing react-native to Electron. Do you know if you could build Nylas Mail at the same pace with react-native? Will the binary size/RAM usage drop significantly on react-native?

I haven't yet seen a substantial desktop app built with React Native and afaik neither FB nor GitHub is investing in React Native for desktop so generally this is hard to say. React Native is more of a framework whereas Electron is a runtime-- much different goals though both are super cool and I'm enthusiastic about the future of both!