Discussion on "Fitbit, Google Health, and What's Next"

Erv Walter · 2026-07-23T19:31:54.533Z

If you use TrendWeight with a Fitbit account, there's a change coming that you should know about. tldr: Google is retiring the API that TrendWeight uses to read weight data from Fitbit, and once it's

I've bought a Withings Body Smart scale and it seems to work well. My Tanita scale was more than twenty years old so I felt it had done its time.

While I was setting up my Withings account (before the scale arrived) I noticed that I could get the Withings account to pull weight and other data automatically from Google Health, and then Trendweight was pulling the data from both the outgoing Fitbit API and also from the Withings account.

Could this be a solution for Fitbit users connected to Google Health? They create a Withings account and use Google Health Connect to automatically sync data from their Fitbit account to their Withings account. They then connect Trendweight to the Withings account and can see the data from their Fitbit account (via Withings, with no Withings device required).

Hopefully this will help some people if it works.

I've been manually entering my weight/BF into Google Health to sync to Trendweight since Google killed the fitbit app a while back. I am not tech savvy enough to even think about attempting the API thing on my own. Any chance of getting an autosync set up with the Garmin Index S2 scale? If not, then I will just manually log my data directly into trendweight...but Garmin autosyncs with MyFitnessPal, so there must be a way to do it. :)

I have no plans to directly integrate with Garmin. They don't have an open API for hobby use. Manual entry in trendweight is likely the best option unless/until someone else figures out how to create a tool that bridges the two systems.

Erv, Thanks for all you do. I have used Trendweight for 13 years. I don’t use a Fitbit anymore, but I use an Aria scale. Will this change affect me? Thanks again, John.

Yes, the Aria Scale is a Fitbit product so it will stop syncing sometime in September when Google turns the old API off.

Hi Erv. I just tried the manual entry. It defaulted to my last weight (242.5), but when I edited the date and body fat and tried to enter it, it failed, saying I needed to add my weight. Believe it or not, I'm exactly the same today (242.5) as I was on June 24. Numbers are funny. Can you please review that? Thanks. bp

I'll fix the UI. It doesn't default to anything, rather it shows you as a subtle reminder in the text box what your previous weight was (as a reminder), but you still have to type that number in there. I'll move that reminder out of the text box itself so that it doesn't seem like it's already filled out.

Thanks, Erv. For clarity, I did try to type it in again, but it wouldn't accept my input. It seemed to lock out the field. I'll try again. Thanks.

Thank you, Erv. Your tools have been a huge part of my weight loss journey. I look forward to manual entry to show my long-term progress.

Thanks for building TrendWeight, and for the communication about the changes. It's amazing to see a developer care so much a out the users of a hobby project!

I've been a TrendWeight user for over a decade, and it's been amazing for helping me improve my health.

here forever. Will connect the personal API and see what else AI can help do.

As far as I can tell, Fitbit has already stopped syncing new weight data to TrendWeight

For what it's worth, my weight synced fine from Fitbit 10 mins ago

Yeah, it's intermittently working it seems.

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Fitbit, Google Health, and What's Next

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