Sync your contacts, calendars and tasks. Two-way sync: Manage and synchronize address books, calendars and task lists with a single app. Secure & reliable: Designed for simplicity, security and privacy. Modern GUI. Seamless integration: Works with your favorite calendar and contacts app. Protect your privacy while keeping the convenience of modern smartphones. Store your data safely and stay in sync – with DAVx5. DAVx5 is not only about getting back control over your data. In the same way it also opens new possibilities of working and living together in a digital world. We've put some of the examples here to let you know what can be achieved with DAVx5 and how life can be made easier without losing control over your data.