Before I go into the actual question, let me give you some context. I am running my own instance of [ownCloud](http://owncloud.org/) which allows me to host my own CalDAV server among other things. I use an app called SolCalendar that is able to sync calendars with my phone but does not sync tasks. 

I am looking for an app that is able to do a two-way sync of tasks with a CalDAV type server. This app **must** have its own user interface (aka please do not suggest [this app](https://play.google.com/store/apps/details?id=org.dmfs.caldav.lib&hl=en) to me. It does not have its own UI and requires another app to function properly).

Requirements:

* Must be able to do a two-way task sync with any CalDAV server (e.g. I must be able to insert my own URL to the server)
* **Must** have its own user interface
	+ I don't necessarily care how it looks, as long as it has the basic things a task app should have
* Should be free, but its not a major requirement