aCalendar works together with the app tasks.org to support tasks from CalDAV servers.

If you use a CalDAV server (like Nextcloud, ownCloud, Synology, web.de, or GMX), you can sync and manage your tasks using tasks.org:

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One Sync Tool for Everything

tasks.org can sync using DAVx⁵. This means you can use one single sync app for both your calendar events and your tasks.

For full details on setting up CalDAV calendars, please see our guide:
CalDAV calendars (ownCloud, Synology, Yahoo, etc.)