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Spike vs eM Client: catalog facts
Spike	eM Client
Freemium Free for individuals; paid plans add AI and team features.	Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…
Windows, macOS, Android, iOS	Windows, macOS, Android, iOS
Chat-style layout can make long threads easier to follow AI features aim to help with organizing and responding faster	Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window
Chat-style format is a matter of preference and not for everyone Advanced AI and team features require a paid plan	No Linux version The free licence is capped at two accounts and forbids any commercial use
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 20, 2026

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