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Mailspring vs eM Client: catalog facts
Mailspring	eM Client
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…
Windows, macOS, Linux	Windows, macOS, 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	Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	No Linux version The free licence is capped at two accounts and forbids any commercial use
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

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