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Software · Internet & communication

Aerion

Lightweight open-source email client for Linux.

  • Completely free
  • Windows, macOS and Linux
  • Open source

Overview

Aerion is an email client, available on Windows, macOS and Linux.

Features described in its Flathub listing, in its GitHub repository and on its official website: code completion, themes and dark mode.

Services and protocols mentioned: IMAP, SMTP and CardDAV.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Aerion - An Open Source Lightweight E-Mail Client for Linux, macOS, and Windows” — official website, 10 November 2026
  • “Contact sync (CardDAV, Google, Microsoft) for auto-completion” — Flathub, 10 November 2026
  • “Dark mode and multiple color themes” — Flathub, 10 November 2026

At a glance

All of Aerion is free: no feature is locked behind a paid plan, and its code is open.

Its licence (Apache-2.0) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • Commercial use allowed

About

Aerion is a modern, lightweight email client inspired by Geary, focused on resource efficiency and a clean user experience. Features: Multiple email accounts with unified inbox Support for Gmail, Outlook, and generic IMAP/SMTP Conversation threading Rich text WYSIWYG composer with TipTap editor Contact sync (CardDAV, Google, Microsoft) for auto-completion Dark mode and multiple color themes Keyboard-friendly navigation with vim-style shortcuts Detachable composer window Basic tracking element removal from emails PGP and S/MIME support Contacts extension (ALPHA) Calendar extension (ALPHA) Custom OAuth support for generic IMAP, SMTP, CardDAV, and CalDAV

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Unspecified source (platforms) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Last technical check: 5 November 2026
  • Description from Flathub — AppStream (Flathub)

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