You can synchronize your hiTask with calendar apps on your desktop or mobile device!
HiTask provides your calendar feed using industry-standard CalDav protocol. Among applications that support this protocol are Apple Calendar, iOS Calendar (iPhone, iPad, iPod touch), Mozilla Thunderbird. MS Outlook does not support this directly but it may be possible using third party add-ons.
To Connect to hiTask calendar user this address: secure.hitask.com/calendar/<username> where <username> is your hiTask account user name. For example if your user name that you use to log in to HiTask is john, calendar address will be secure.hitask.com/calendar/john
You also required to enter your hiTask user name and password.Instructions for Mac OSX Calendar Instructions for iOS Calendar (iPhone, iPad)