Hello @vause, nice to see you have joined the Fitbit Community! This third party app does not figure among the official supported apps. But I've seen many apps that are not officially supported but are able to work with Fitbit, the only difference is we do not have details on how the information is shared across the accounts.
The best to do is contact the support you are interested to learn ore about the compatibility and how it works.
For more details please, take a look at our Third Party Apps - FAQ.
See you around and let me know if you have more questions.
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