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

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