02-24-2025 19:28
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02-24-2025 19:28
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I want to write an iOS app that uses heartbeat data to calculate HRV, or calculate HRV in the Fitbit device itself. Currently, Fitbit Inspire 2 calculates HRV only for when user is sleeping. I'm interested in what you are doing.

02-25-2025 14:30
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02-25-2025 14:30
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Hi @TiggerPooh
It's not clear to me what you are asking for in your post. Using the Web API is freely available. You can have access to the HR and HRV data. Yes, we calculate HRV while the user is sleep. If you want access to the intraday data, then you need to submit a request at https://dev.fitbit.com/build/reference/web-api/intraday/.
If you need anything else, please let me know.
Senior Technical Solutions Consultant
Fitbit Partner Engineering & Web API Support | Google

