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Aerion vs Convey: catalog facts
Aerion	Convey
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the LGPL 2.1 or later.
Windows, macOS, Linux	Linux
Built with Wails instead of Electron for lower resource use Direct IMAP and SMTP connection with mail stored locally	Conversation-centred view of email Made for the GNOME desktop
Young project with a smaller feature set than established clients Tracking protection is described as basic	Very new project, started in 2026 Feature set is not documented in detail
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: LGPL-2.1-or-later
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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