KOrganizer review
A capable Linux group calendar for users who value open standards and source freedom.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
KOrganizer is KDE’s calendar and scheduling component for Kontact, designed for Linux desktop users who need more than basic event entry. It brings together events, to-dos, journals, reminders, recurring appointments, multiple calendars, attendee management, and group scheduling. Its agenda, month, timeline, and to-do views support both personal organization and shared calendar work. The product is particularly suited to people who prefer open-source software, local calendar management, and standards-based connectivity.
The pricing model is straightforward: KOrganizer is free and open source, distributed under the GPL-2.0-or-later license rather than through paid subscription tiers. That makes the full feature set available without a plan upgrade. Core scheduling capabilities include invitations and responses, free/busy publishing and retrieval, attachments, calendar printing, and recurring events. Import and export use iCalendar and vCalendar, while support for local files and network resources gives administrators flexibility in how calendars are stored and shared.
Its strongest fit is within Linux and groupware ecosystems. Integrations include Nextcloud, Kolab, Google Calendar, CalDAV, GroupDAV, Open-Xchange, and KMail, with two-way calendar synchronization listed as a category capability. Email-based group scheduling is supported, which helps teams coordinate attendees without requiring a separate booking workflow. The trade-off is platform scope: KOrganizer is a Linux desktop application and has no mobile apps. Choose it for open-source group calendaring with broad standards support; choose another calendar app if mobile access, booking links, or a more platform-spanning experience is central to the workflow.
KOrganizer pros and cons
- Where it wins
- Free and open source under the GPL-2.0-or-later license
- Group scheduling includes invitations, responses, and free/busy data
- Supports CalDAV, Google Calendar, Nextcloud, Kolab, and more
- Where it doesn't
- Officially available only as a Linux desktop application
- No mobile apps for calendar access away from the desktop
- Does not include verified booking links or time-blocking tools
KOrganizer fact sheet, pricing and score →
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