Kronolith review
A capable shared calendar for Horde deployments, with limited platform breadth.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Kronolith is a web-based calendar application in the Horde ecosystem, designed for deployments serving multiple users or groups. It supports individual calendars as well as shared calendars with user and group permissions, making it a practical fit for organizations that need collaborative calendar access without moving away from open-source software. Its free open-source model includes core scheduling features such as recurring and all-day events, calendar overlays, invitations, and free/busy information.
Kronolith fits most naturally into environments already using Horde Framework, Kolab, SQL databases, or CalDAV clients. It can work with remote calendars and supports iCalendar and iTip invitations, while import and export in iCalendar and CSV formats help move calendar information between systems. CalDAV support also gives it a place within client-based calendar workflows. Because it is intended to run as part of a Horde installation, it is better suited to managed deployments than to buyers seeking a standalone hosted calendar service.
Its feature set is broad for shared calendar administration, covering permissions, resource management, alarms, overlays, and free/busy data. The trade-off is a narrower product surface outside the calendar itself: access is centered on web and API platforms, and it does not provide booking pages, dedicated time blocking, video meeting support, or native iOS and Android apps. Choose Kronolith when open-source control, shared permissions, CalDAV, and Horde integration are priorities. Choose an alternative when mobile apps, public scheduling links, or integrated meeting workflows are central requirements.
Questions about Kronolith
What does Kronolith run on? Web. It runs self-hosted.
What does Kronolith integrate with? 5 integrations: SQL databases, Kolab, Horde Framework, CalDAV clients and iCalendar.
Who is Kronolith built for? Small businesses, mid-market companies and enterprises (our editorial estimate).
Kronolith pros and cons
- Where it wins
- Shared calendars support user and group permissions
- CalDAV, iCalendar invitations, overlays, and recurring events
- Resource management, alarms, free/busy data, and CSV import/export
- Where it doesn't
- Designed to run as part of a Horde installation
- Access is centered on web and API platforms
- No booking pages, native mobile apps, or video meeting support
Kronolith fact sheet, pricing and score →
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