HealthKit and Google Fit can track movement, body information, and over 70 other parameters locally on the phone.

“And that phone, that HealthKit app is sensing every time your phone moves. So it's almost like it's measuring your movement just like the Fitbit does and it stores that data. It also stores many other kind of data, if you want to store. For example, your own information about your body, your height, weight, age, etc. And it can record up to, I think, 70 plus different parameters depending on if you are using a special app or even the same app, if you say what do you [01:12:13] for other companies and it can store that.”