Compare software

MeronMailspring
Free

Free and open source under the AGPL-3.0 licence.

 Freemium

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

Windows, macOS, Linux, Android, iOS Windows, macOS, Linux
  • Kanban board view for organising mail
  • Chat-style threads in a unified inbox
  • 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
  • Conversation-style layout differs from traditional mail clients
  • Newer project with a smaller user base
  • Read receipts and link tracking are paid, and are tracking features
  • Electron, so still heavier than a native client
Downloadable app Downloadable app
Open source Open source
License: AGPL-3.0-or-later License: GPL-3.0
No account needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 21, 2026

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