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Comail

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Comail's own site

What Comail is

Comail is a desktop email client built around keyboard controls, with the mailbox kept on the user's computer. It works with Gmail, Microsoft 365 and Outlook, plus IMAP providers such as Fastmail and iCloud. Inbox tools include a command palette, split inbox, snooze, scheduled send, undo send and bulk triage. Search supports keywords and semantic queries. Optional AI features can summarize messages, draft replies, proofread, run commands and answer inbox questions using OpenAI-compatible providers, including local options such as LM Studio, with the user's own key. The project says mailbox sync and search run on-device, credentials are kept in the operating system keyring, and Comail has no telemetry. Offline, users can read, search, write and triage mail; changes sync after reconnection. The built-in calendar syncs both ways with Google Calendar, Fastmail, iCloud or CalDAV servers. Comail runs on Linux, macOS and Windows and is free software under AGPL-3.0.

Who it suits

Comail suits desktop users who want keyboard-driven email, offline access and an integrated calendar. Its optional AI tools are for users prepared to connect a compatible provider with their own key.

What it does well

  • Reads, writes, searches and triages mail offline.
  • Mailbox sync and search run on-device, according to the project.
  • No telemetry; credentials are stored in the OS keyring.
  • Free software under the AGPL-3.0 license.

What to know first

  • Gmail and Microsoft sign-in require users to configure an OAuth app.
  • Other IMAP accounts require an app password.
  • AI features require a compatible provider and the user's own key.

Plans

PlanBilled and limitsPrice
FreeNo account · no subscription · open source under AGPL-3.0Free

As github.com lists them, read 11 Oct 2026. The maker's own page has the final word.

Getting started

  1. Open the Comail GitHub website
  2. Download the installer for macOS, Windows, or Linux
  3. Install and launch the desktop application
  4. Connect Gmail or Microsoft 365 with your own OAuth app registration
  5. Connect other IMAP accounts with an app password
  6. Optionally add an OpenAI-compatible AI provider key

Verdict

Comail combines desktop email, two-way calendar sync and offline mailbox work across Linux, macOS and Windows. Its account setup requirements and user-supplied AI provider key are worth considering before choosing it.

Questions

How much does Comail cost?

The Free plan costs nothing, with no account and no subscription. It is open source under AGPL-3.0.

Which email services work with Comail?

It supports Gmail, Microsoft 365, Outlook, and IMAP providers including Fastmail and iCloud.

Does Comail work offline?

Yes. You can read, search, write, and triage mail offline, with changes syncing after reconnection.

Which platforms have downloads?

Comail has desktop releases for Linux, macOS, and Windows, including AppImage, DEB, DMG, and EXE packages.

What calendar services can it sync?

The calendar syncs both ways with Google Calendar, Fastmail, iCloud, and any CalDAV server.

Is AI included?

AI features are optional and use OpenAI-compatible providers, including local providers such as LM Studio, with your own key.

Facts from Comail's own pages

Account setup
Gmail and Microsoft sign-in require users to configure their own OAuth app registration once; other IMAP accounts use an app password. · github.com, 11 Oct 2026
AI providers
Optional AI features work with OpenAI-compatible providers, including local providers such as LM Studio, using the user's own key. · github.com, 11 Oct 2026
App coverage
desktop · github.com, 23 Sept 2026
Calendar integrations
Its built-in calendar syncs both ways with Google Calendar, Fastmail, iCloud, or any CalDAV server. · github.com, 11 Oct 2026
Calendar tools
Yes · github.com, 23 Sept 2026
Desktop downloads
The release page lists macOS universal DMG, Windows x64 setup EXE, and Linux AMD64 AppImage or DEB downloads. · github.com, 11 Oct 2026
Email providers
It works with Gmail, Microsoft 365/Outlook, and IMAP providers including Fastmail and iCloud. · github.com, 11 Oct 2026
Free plan
Yes · github.com, 23 Sept 2026
Inbox features
Features include keyboard shortcuts, a command palette, split inbox, snooze, scheduled send, undo send, and bulk triage. · github.com, 11 Oct 2026
License
Comail is released as free software under the GNU Affero General Public License v3.0. · github.com, 11 Oct 2026
Offline access
Yes · github.com, 23 Sept 2026
Offline use
Users can read, search, write, and triage mail offline, with changes syncing after reconnection. · github.com, 11 Oct 2026
Privacy
The project says mailbox sync and search run on-device, credentials are stored in the OS keyring, and Comail has no telemetry. · github.com, 11 Oct 2026
Product
Comail is a fast, keyboard-driven email client that keeps the mailbox on the user's computer. · github.com, 11 Oct 2026
Search and AI
Comail offers keyword and semantic search, plus optional AI summaries, reply drafting, proofreading, commands, and inbox questions. · github.com, 11 Oct 2026
Scheduled sending
Yes · github.com, 23 Sept 2026
Support
The README invites feedback by email at [email protected] and accepts bug reports and feature requests through GitHub Issues. · github.com, 11 Oct 2026
Unified inbox
Yes · github.com, 23 Sept 2026

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