Open source

All docs

Qualendar is a multi-tenant calendar and CalDAV service. It lets organizations and their members manage calendars through the web app and sync them with standard CalDAV clients — macOS Calendar, Thunderbird, mobile devices, and others.

It is free and open-source software. The complete source code is public: https://github.com/ubermuda/qualendar.

The license, in plain English

Qualendar is licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0-or-later). In short:

  • You are free to use, study, modify, and share it.
  • If you distribute it — or run a modified version as a network service — you must make your version's complete source available under the same license.
  • The "Affero" clause is what extends that source-sharing duty to network use: with the AGPL, offering the software to users over a network counts as distribution.

The full text is in the LICENSE file. This summary is not a substitute for it.

Hosted or self-hosted

You can sign up for the hosted service and let us run it for you, or run your own instance. Both use exactly the same open-source code.