Lookout

Free plan Linux

What Lookout is

Lookout is a native GNOME email client for Linux that combines mail, calendars, contacts, and tasks in one desktop application. It uses IMAP and SMTP for email, CalDAV for calendars and tasks, and CardDAV for contacts. Accounts can be added through GNOME Online Accounts or configured directly. Multiple IMAP accounts, conversation threads, full-text search, snooze, follow-up tasks, tags, and message actions are supported. Calendar views include month, week, day, agenda, and split layouts, with recurring-event editing, invitations, webcal subscriptions, and .ics imports. Mail, calendar, and contact data are cached locally in SQLite and remain readable offline. The maker lists Google, Microsoft 365, Nextcloud, and Google Tasks integrations through GNOME Online Accounts. Messages render in a sandboxed WebKit view and remote images are blocked by default. Linux packages are available as Flatpak, Snap, .deb, and .rpm, with source-build instructions. Lookout is free, open source under GPL-3.0-or-later, and described as an independent Outlook desktop reimplementation without Microsoft code or Exchange dependency.

Who it suits

Lookout suits Linux users in a GNOME session who want email, calendar, contacts, and tasks together with offline reading. Other GTK desktops can run it when required GNOME services are available.

What it does well

Combines mail, calendar, contacts, and tasks
Supports IMAP, CalDAV, and CardDAV
Data remains readable offline
Remote images blocked by default
Multiple Linux package formats available

What to know first

Built primarily for GNOME sessions
Other desktops require GNOME services
No Microsoft code or Exchange dependency
Free trial information is not provided

Plans

Plan	Billed and limits	Price
Lookout	Free and open source · GPL-3.0-or-later	Free

As lookout-mail.com lists them, read 12 Oct 2026. The maker's own page has the final word.

Verdict

Lookout brings common personal information tools into one free, open-source Linux application. Its protocol support, offline cache, and privacy controls suit GNOME users managing multiple accounts.

Facts from Lookout's own pages

Account connections: Accounts can be added through GNOME Online Accounts or configured directly with IMAP and SMTP settings. · lookout-mail.com, 12 Oct 2026
App coverage: desktop · lookout-mail.com, 20 Sept 2026
Calendar features: Its CalDAV calendar offers month, week, day, agenda and split views, recurring-event editing, invitations, webcal subscriptions and .ics imports. · lookout-mail.com, 12 Oct 2026
Calendar tools: Yes · lookout-mail.com, 20 Sept 2026
Credential storage: For manually configured servers, passwords are stored in the GNOME keyring and fetched when needed; the maker says they do not touch disk. · lookout-mail.com, 12 Oct 2026
Desktop requirement: Lookout is built for a GNOME session; other GTK desktops can run it if GNOME Online Accounts and the keyring services are available. · lookout-mail.com, 12 Oct 2026
Free plan: Yes · lookout-mail.com, 20 Sept 2026
Integrations: The maker lists Google, Microsoft 365 and Nextcloud support through GNOME Online Accounts, plus Google Tasks. · lookout-mail.com, 12 Oct 2026
License: Lookout is described as an independent, free and open-source GPL-3.0-or-later reimplementation of the Outlook desktop experience, with no Microsoft code or Exchange dependency. · lookout-mail.com, 12 Oct 2026
Linux packages: The maker offers Flatpak, Snap, .deb and .rpm packages and instructions to build from source. · lookout-mail.com, 12 Oct 2026
Mail features: The app supports multi-account IMAP sync, conversation threads, full-text search, snooze, follow-up tasks, tags and message actions. · lookout-mail.com, 12 Oct 2026
Mail protocols: It uses IMAP and SMTP for mail, CalDAV for calendars and tasks, and CardDAV for contacts. · lookout-mail.com, 12 Oct 2026
Offline access: Yes · lookout-mail.com, 20 Sept 2026
Offline use: Mail, calendar and contacts are cached locally in SQLite and remain readable offline. · lookout-mail.com, 12 Oct 2026
Privacy: Messages render in a sandboxed WebKit view, remote images are blocked by default, and the maker says data is sent only to users’ own servers. · lookout-mail.com, 12 Oct 2026
Product: Lookout is a native GNOME email client that combines mail, calendar, contacts and tasks in one app. · lookout-mail.com, 12 Oct 2026

Where Lookout stands on Freedom251

Email clients#75 of 142