Tried 3 different apps, some work and some don’t..the tracker needs charged daily and either you lose steps or sleep report. Each time it charges it needs app opened, plus rebinding it! Too much is lost to use this type of tracker. I had one night from 3 weeks tell me how I sleep, part of why I got it. Now it won’t bind at all! Where bracelet meets tracker is bulky and doesn’t line up well! I put tape on it to prevent scratches but can’t wear because I can’t bind it!