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eM Client vs Spark Mail: catalog facts
eM Client	Spark Mail
Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…	Freemium Free for individuals; paid plans add AI features and team tools.
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window	Automatic inbox categorization cuts down on manual sorting AI-drafted replies can speed up routine email responses
No Linux version The free licence is capped at two accounts and forbids any commercial use	AI and team features are gated behind a paid plan Some categorization requires manual correction over time
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 22, 2026

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