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Have you ever wondered how iOS and more specifically the Health app handles and prioritizes data from multiple sources?
I have an Apple Watch and an iPhone and both devices, if worn or carried at the same time, record the number of steps I take, among other data. Yet, the Health app reports the number of steps accurately and prevents duplicate data entry.
Until recently, I didn’t think about this because I naturally expected Apple to have figured out how to prevent duplicate data reported by both the iPhone and the Apple Watch.
Apple and Third-Party Devices
However, yesterday I got a Jawbone UP2 and the thought crossed my mind when the UP app asked for permission to read and write health data such as number of steps taken.
I’ll explain the reason behind buying a Jawbone UP2 in one of my next posts.
I talked to Apple to find out more about how Health prioritizes data from multiple sources and I was pointed to the following knowledge base article.
Turns out you can set the priority of your data sources for each attribute of your health data.
By default, Health uses the following order to prioritize sources:
- Health data that you input manually.
- Data from your iPhone, iPod touch, and Apple Watch.
- Data from other third-party apps and Bluetooth devices.
Between the iPhone and the Apple Watch the following order is set by default:
- Apple Watch
That confirms what I expected, iOS and Health are smart enough to prevent duplicate data from being reported and it’s nice to know that I could change the priority manually, if I was so inclined.