Kronolith
What Kronolith is
Kronolith is Horde’s web-based calendar application for personal calendars, collaboration, and scheduling. Users can create multiple calendars and give people or groups read, edit, or full permissions. Several views are available, including an overlaid display that combines calendars. Event support includes recurring events, alarms, resource management, and free/busy information. Kronolith handles invitations through iCalendar and iTip and supports CalDAV. Calendar data can be imported or exported in iCalendar and CSV formats, while remote calendars are supported as well. Calendars may use a SQL database or a Kolab server as their backend. The application includes task integration and provides Ajax and mobile interfaces. Kronolith is OSI Certified Open Source Software and can be included in Horde Groupware with Turba, Nag, and Mnemo. It is available on Android, iOS, Linux, self-hosted deployments, and the web. Installation guidance is included in the distribution’s docs/INSTALL file, and the project points users to a FAQ and mailing lists for help. The listed Kronolith plan is free.
Who it suits
Kronolith suits individuals, groups, and organizations needing shared calendars, permissions, invitations, and scheduling. Its self-hosted and web availability fits users who can manage Horde-based deployments.
What it does well
- Multiple calendars with read, edit, or full permissions
- Overlay views combine calendars
- Supports CalDAV and iCalendar/iTip invitations
- Imports and exports iCalendar and CSV
- Free, OSI Certified Open Source Software
What to know first
- Installation instructions are provided in distribution documentation
- Calendar backends are SQL or Kolab
- Support is directed to FAQs and mailing lists
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Kronolith | Open source calendar application | Free |
As horde.org lists them, read 13 Oct 2026. The maker's own page has the final word.
Verdict
Kronolith provides shared scheduling with standards support, permissions, and several interfaces. Its free open-source model and self-hosted options appeal to users comfortable managing the surrounding Horde environment.
Facts from Kronolith's own pages
- Backends
- Calendars can be backed by a SQL database or a Kolab server. · horde.org, 12 Oct 2026
- CalDAV
- Kronolith supports CalDAV. · github.com, 13 Oct 2026
- Calendar sharing
- Users can create multiple calendars and grant users or groups read, edit, or full permissions. · horde.org, 12 Oct 2026
- Calendar views
- Users can overlay multiple calendars in a single view, and the application provides several calendar views. · horde.org, 13 Oct 2026
- Distribution
- Kronolith’s README directs users to installation instructions in the distribution’s doc/INSTALL file. · github.com, 13 Oct 2026
- Events
- Supported event features include recurring events, alarms, resource management, and free/busy management. · horde.org, 12 Oct 2026
- Events and reminders
- Supported features include alarms and recurring events. · github.com, 13 Oct 2026
- Free plan
- Yes · horde.org, 22 Sept 2026
- Groupware bundle
- Horde Groupware bundles Kronolith with Turba, Nag, and Mnemo. · horde.org, 13 Oct 2026
- Import and export
- Kronolith supports importing and exporting iCalendar and CSV formats. · github.com, 13 Oct 2026
- Interfaces
- Supported interfaces include Ajax and mobile interfaces. · github.com, 13 Oct 2026
- Mobile interface
- The documentation lists Ajax and mobile interfaces as supported features. · horde.org, 12 Oct 2026
- Open source
- The project describes Kronolith as OSI Certified Open Source Software and lists a GPL-2.0 license. · github.com, 13 Oct 2026
- Purpose
- Kronolith is Horde’s web-based calendar application, with calendars backed by a SQL database or a Kolab server. · github.com, 13 Oct 2026
- Remote calendars
- Kronolith supports remote calendars and resource management. · github.com, 13 Oct 2026
- Scheduling
- Supported features include invitation management using iCalendar/iTip and free/busy management. · github.com, 13 Oct 2026
- Shared calendars
- Yes · horde.org, 22 Sept 2026
- Sharing
- Users can create multiple calendars and grant users or groups read, edit, or full permissions. · horde.org, 13 Oct 2026
- Standards
- Kronolith supports CalDAV and iCalendar/iTip invitation management. · horde.org, 12 Oct 2026
- Support
- The project points users to its FAQ, application mailing lists, and the #horde IRC channel for assistance. · github.com, 13 Oct 2026
- Task integration
- Kronolith supports integration with tasks. · github.com, 13 Oct 2026
- Tasks integration
- Kronolith includes tasks integration. · horde.org, 12 Oct 2026
- Views
- The interface can display multiple calendars together in one overlaid view. · horde.org, 12 Oct 2026
Where Kronolith stands on Freedom251
- Calendar apps#39 of 194