There is apparently some integration with ST that is in testing according to this thread: Withings ws50 scale
It’s a great scale, I’m really satisfied with it. Just looking at the different graphs on the Withings Healthmate app is great motivation to continue whatever efforts you’re doing to get in shape. And the integration with apps like Runtastic, Jawbone Up, Myfitnesspal and others is really useful to get a clear picture of your overall progression.