I have used steemhunt a small bit but the concept doesn't really excite me even if it is really well set up.

Actfit on the other hand is so basic and needs so much work to get it to a working level in terms or design and functionality. However this project really excites me as i already use Samsung health to track my movement every day. And for me that is the most important part, here is an app that you will use every day and interact with the steem blockchain everyday.
In my opinion it's project like this that will really gain a following and add to the blockchain.