Merkuro Calendar, formerly Kalendar, is free software for managing events and tasks on Linux and Windows. It works with local calendars and online sources including Nextcloud, Google Calendar, Outlook, and CalDAV. Event views cover the month, an hour-by-hour week, and an upcoming-event schedule. The task area supports tasks, subtasks, a tree structure, and customizable filters for narrowing related work. KDE says Merkuro was built for desktop, mobile, and devices in between. The application uses the GPL-3.0-or-later license and can generally be installed without charge. Linux installation is offered through Discover, other AppStream stores, or a distribution package manager; Windows is also listed. Nightly installers are available for testing, and KDE labels them unstable builds from the latest development branch. Help links include a KDE forum, Merkuro Matrix channel, and bug reporting. KDE’s software privacy policy says its software generally does not transfer device information unless a user explicitly acts, though third-party distributors may modify the software.
Who it is for
Merkuro Calendar suits users who want a free, open-source calendar and task application across Linux or Windows, with local and online calendar sources.
What is good
- Supports Nextcloud, Google Calendar, Outlook, and CalDAV
- Month, week, and schedule event views
- Tasks include subtasks, tree view, and filters
- GPL-3.0-or-later licensed free software
- Linux and Windows availability
What to know first
- Nightly installers are labeled unstable
- Third-party distributors may alter privacy behavior
- No free trial is offered because it is free software
Verdict
Merkuro Calendar combines multi-source calendars with structured task management in a free KDE application. Stable packages are available through listed Linux channels, while Windows nightly builds are intended for testing.
Merkuro Calendar (formerly Kalendar) plans and pricing
All plansCompared on calendar apps
- Free plan
- Yes
