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MailspringBlueMail
Freemium

The client is free and open source. Mailspring Pro is a monthly subscription that adds…

 Freemium

The client is free to download. Some features are reserved for paid plans.

Windows, macOS, Linux Windows, macOS, Linux, iOS
  • Unified inbox, snooze, send later, rules and templates in the free tier
  • C++ sync engine keeps memory and battery use down for an Electron app
  • One inbox covers many accounts across Windows, macOS, Linux, Android and iOS with a consistent interface and shared…
  • Read receipts and link tracking are paid, and are tracking features
  • Electron, so still heavier than a native client
  • It is closed source, some features need a paid plan, and its handling of account credentials has drawn…
Downloadable app Downloadable app
Open source Closed source
License: GPL-3.0 License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.