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Mailspring vs Meron: catalog facts
Mailspring	Meron
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Free Free and open source under the AGPL-3.0 licence.
Windows, macOS, Linux	Windows, macOS, Linux, Android, 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	Kanban board view for organising mail Chat-style threads in a unified inbox
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	Conversation-style layout differs from traditional mail clients Newer project with a smaller user base
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0-or-later
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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