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Mailspring vs Evolution: catalog facts
Mailspring	Evolution
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Free Free and open source, part of the GNOME project.
Windows, macOS, Linux	Linux
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	Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	Linux only Heavier than a mail-only client, and slower to start
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-or-later and LGPL-2.1-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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