Unstable and becomes useless
When it did work it took forever to connect to server each and every time you tried to enter someting, so you are always watching the rotating circle (too bad that activity didnt burn calories). Using wifi or LTE made no difference waiting to connect ALWAYS. There was intermittent sync problems btw iPhone, iPad and PC, so pick one and use it only. When you enter activity you often get credit for 100s of hours of walking, bike riding etc.. and you have to manually re-enter and delete entries. This past Monday I lost 2 month of entries for most of the day, assumed they were go forever, by the time they came back I had moved on to myFitnessPal.... essentially same product but works (so far) a lot better, more flexible and quick.
TTC_Users about
FitDay - Free Diet and Weight Loss Journal, v2.4