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eM Client vs Twobird: catalog facts
eM Client	Twobird
Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…	Free No pricing is listed on the homepage.
Windows, macOS, Android, iOS	macOS
Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window	Notes, reminders and to-dos inside the inbox Collaborative notes within conversations
No Linux version The free licence is capped at two accounts and forbids any commercial use	Site gives few details on supported platforms and email providers
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 October 2, 2026

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