Mailspring Libre
Free
Mailspring Libre comes completely free of charge. No plans, no upgrades, no money.
Libre
Free as in freedom. UI and app licensed under the GPLv3.
Private
All telemetry is disabled. No centralized server is needed.
Beautiful
Mailspring is beautiful and functional. Themes and plugins allow for limitless customization.
Cross-platform
Mailspring Libre uses Electron to work across all major platforms: macOS, Linux, and Windows.
Mailsync
The sync engine, MailSync, is proprietary, and while we're working on replacing it, it probably won't happen anytime soon.