Body fat scale with public API? Withings vs. Fitbit? Or something else?

Currently, I’ve been using my normal weight and the U.S. Navy seals method for calculating body fat, but I would like to “automate” the process, so I only have to stand on a scale.

This is what I want:

  • Weight, Lean body mass & Lean fat mass
  • Relative measure of progress (It doesn’t need to be absolutely correct)
  • A good Public API, so I can automate the export

But I was afraid of buying the withings, because some people say they have a really bad API:

What do you think is the best choice for me?
Withings? Fitbit? Something else?

I have been using an older model of their body composition weight scale for almost 8 years now, and it’s given me no trouble. Their API isn’t going to win any awards, but it’s been stable, and you shouldn’t have any trouble getting body mass + fat mass.

As with any such device, you’d have to see how closely their fat mass estimates track your manually measured values.

I use a cheap Renpho Bluetooth weight scale. https://www.amazon.ca/RENPHO-Bluetooth-Body-Fat-Scale/dp/B01N1UX8RW/
The included app easily syncs with Google Fit. Google’s API requires proper Oauth2 authentication but once you get over that hurdle, the daily data from the scale is solid.

Other benefits of the scale is long battery life and it’s rechargeable via a micro-usb cable. Also, it seems to be relatively accurate… if I weigh myself 3 times in 55 minutes, it’s usually within .2 of a pound or less.

I’m not associated with Renpho, I’ve just used the scale for more than a year and been happy with it and it’s easy linking to Google Fit.

I’ve also used a Renpho scale, and I like it as well. It also connects to Apple Healthkit.

@dreeds Do you have any sense how accurate the body composition measurement is? Just curious.

I did also consider buying a cheaper scale that syncs with Google fit or similar, because then I can just get the data from the Google fit API :slight_smile: There wouldn’t be any downsides to that? Right?

I don’t have any other scales and I haven’t done any other body composition tests (dexa scan, bod pod, hydro-static, calipers, etc) so I can’t say. But I do know the scale is better than previous scales I’ve owned… I just put it in three different rooms within a few minutes and got the exact same readings. So, the variance is small, though I don’t know how to test for accuracy.

But for me, I focus more on the trends than the absolute numbers. For example, if my weight, bmi and subcutaneous fat percentage are all going in the wrong direction, it’s a pretty clear indicator that I need to take action.

The scale I use has almost 40,000 ratings on Amazon and it’s sitting at 4 1/2 stars out of five, so it’s meeting most people’s needs.

The other thing I didn’t mention is that it works for multiple people… I added the app to my partner Christine’s phone and linked it to Google Fit. She uses it almost daily. EventLoggers pulls her weight from Google Fit and all she has to do is stand on the scale, so she’s happy too. YMMV

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What kind of data can you get from the Google fit API from the Renpho scale?
Can you both get weight, Lean body mass & fat mass?

My apologies - I link Renpho data to my Fitbit account (just weight) and not Google Fit, so I can’t comment on what metrics are available to Google Fit. For Fibit, it looks like it’s only weight. Sorry for the mistake… so many APIs!

This might be of interest: https://github.com/oliexdev/openScale

Open source app and a list of scales with which it works.

I’ve not used it myself, but stumbled across the page while looking for cooking scales with an open API.

Are you sure they have an API? It doesn’t say anything about API on the wiki.

Also they support Renpho ES-CS20M, but I think I want to buy Renpho ES-CS20M-B