Polar FT4 & H7 & iPhone app?

iheartmy1dog
iheartmy1dog Posts: 207
edited January 31 in Fitness and Exercise
I recently got a polar ft4 and have been using it. I decided to order the h7 so it could sync to the iPhone app... I tried it out tonight and the watch tells me about 20cals less than the app...... They're both synced to the same heart rate monitor on me so I why not the difference? Anyone else have this issue?

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