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Simple Scales requires OS version 26. Access to Apple Health is also required.
Simple Scales allows you to set your preferred units inside the Settings page. Behind the scenes Simple Scales converts your values to a standard unit. In Apple Health you can change your unit there to display as you wish.
These can be viewed in the Apple Health app and then searching for Weight. Scroll to the bottom of the page and tap on Show All Data.
We currently only support Apple Health. This means that Simple Scales is only available for the iPhone, Apple Watch, and iPad.
The Apple Watch keeps a subset of your Apple Health database locally. Height isn't a value that changes often and if it's past the cutoff timeframe of the database then Simple Scales won't have height to work with to save BMI. If this happens save a new Height entry on your iPhone and let it sync to your Apple Watch.
No, Simple Scales is intended to work with traditional bathroom scales. You weigh yourself on the bathroom scales and then manually enter your weight which gets saved to Apple Health.