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Evolution vs Aerion: catalog facts
Evolution	Aerion
Free Free and open source, part of the GNOME project.	Free Free and open source under the Apache 2.0 licence.
Linux	Windows, macOS, Linux
Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365	Built with Wails instead of Electron for lower resource use Direct IMAP and SMTP connection with mail stored locally
Linux only Heavier than a mail-only client, and slower to start	Young project with a smaller feature set than established clients Tracking protection is described as basic
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later and LGPL-2.1-or-later	License: Apache-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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