ContactSync - CardDAV and more

★★★★★ Excellent app and excellent support from the developer. Keeps my contacts in sync with my Card DAV server and works where similar apps failed.

★★★★★ Great application Syncing my contacts with an owncloud installation. Had some problems at first, but the developer fixed them very quickly. Works like a charm! Great support!

★★☆☆☆ I was trying to transfer my contacts, messages...etc. from my old Android 4.1.2 (Jellybean) to the new phone with Android 5.1 (Lollipop). I spent over six hours without success. When I sent email to the designated address: consync@gmx.at, the person who replied my email seemed to be a total stranger unrelated to the app developer. This is the worst app I have ever purchased and installed. It did not work, and the whole experience was not user-friendly; it is a waste of time and money though it costs less than $3. I am asking for a refund. Reasons are as followed: (1) The instructions are cumbersome, confusing, with plenty of English spelling errors, and it seems that the developer was completing the app on the run without even considering of doing a spell check. (2) The installation steps were not well thought through, (3) The interface was poorly designed, too much computer jargon, and in lack of effective guidance to the consumers particularly people who are not IT savvy. I am not going to do anything with this developer except for a refund! I wish it is not a scam!