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Geary vs Aerion: catalog facts
Geary	Aerion
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free and open source under the Apache 2.0 licence.
Linux	Windows, macOS, Linux
Related messages collapse into conversations and full-text search is fast, which makes it pleasant for straightforward…	Built with Wails instead of Electron for lower resource use Direct IMAP and SMTP connection with mail stored locally
It is Linux-only and deliberately minimal, with no built-in encryption, rules engine or calendar.	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: LGPL-2.1	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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