Google Fit is, like most things Google publishes on the Play Store, popular by necessity. The fitness and activity tracking service debuted around the time Android 5.0 did, and people were understandably excited. After all, a built-in fitness and activity tracker app only makes sense on a smartphone full of sensors, and Google is well-renowned for its number-crunching and algorithm-refining prowess. But reviews of the Google Fit app on the Play Store are pretty brutal.

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