Fitbit provides a free and open API for 3rd party developers to use with their apps to integrate your Fitbit data with their apps. You would need to ask them as Fitbit has no control over how the API is used or whether they use it at all.
Best AnswerBasically @Roger50126 as @SunsetRunner explained, if Sharecare says they are compatible then they will have info on how to link up.
A quick search of the web for the terms Sharecare + Fitbit gives me this hit on the Sharecare help docs.
As for the compatible apps list, this is only the apps that Fitbit is aware of. As explained Fitbit has an open API and apps do not need Fitbit's permission to link up, therefore Fitbit may not be aware of every app.
Anyway please go to the help page at https://support.you.sharecare.com/hc/en-us/articles/360010003354-How-do-I-connect-my-Fitbit-
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