which fitbit apps are accessible

Is the fitbit Charge or Fitbit Charge 2apps accessible with VoiceOver? Is it easy to navigate and use? my wife is trying to find a fitbit app to help monitor her heart rate. I use a Fitbit Flex which doesn't have this information.

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#1 I don't know anything about a

I don't know anything about a charge app, but the fitbit app itself is usable with VO. You can do pretty much everything that others can do with that app.