Kronolith
Kronolith: A capable shared calendar for Horde deployments, with limited platform breadth. Ranked #85 of 193 in Calendar Apps by our editors (3.0/10); pricing: Free plan; best for open-source users needing shared web calendars.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forOpen-source users needing shared web calendars
- Free planYes
- Paid fromFree
- Facts checked22 Sep 2026
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
Our verdict on Kronolith
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).
Your product? Our editors can test Kronolith in depth and publish a review, labelled as paid · from $149/mo →
Kronolith pricing
Kronolith fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Shared calendars | Yes |
| Time blocking | Not verified |
| Scheduling links | Not verified |
| Calendar sync | Not verified |
| Mobile apps | Not verified |
| Video meeting support | Not verified |
| Deployment | Self-hosted |
| Platforms | Web |
| Support | Email, Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 5 integrations: SQL databases, Kolab, Horde Framework, CalDAV clients, iCalendar |
| Pricing | Free plan |
| Website | horde.org |
| Facts checked | 22 Sep 2026 |
Kronolith integrations
Kronolith lists 5 integrations on its own site.
- SQL databases
- Kolab
- Horde Framework
- CalDAV clients
- iCalendar
Alternatives to Kronolith
- Google CalendarA versatile calendar for personal schedules and Google Workspace collaboration.9.4
- Microsoft OutlookA flexible calendar choice for people and teams already working in Microsoft’s ecosystem.9.2
- Zoho CalendarA low-cost calendar with booking, sync, room reservations, and broad integrations.9.1
See all Kronolith alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
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