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

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