Challenge
Before
In health management, the biggest walls are "the effort of recording" and "the difficulty of keeping it up." Manual-first entry doesn't last, and nutritional balance is hard to grasp. The cost of supporting both OSes was a challenge too.
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We want to record body composition easilyManual entry is tedious and doesn't last
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We want to grasp meals' nutritional balancePFC calculation is hard
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We want to keep going toward the goalKeeping motivation is a challenge
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We want to reach both iOS and AndroidSeparate builds are costly
Solution
After
For users, the ease of "just measure and it's recorded"; for the operator, the efficiency of shipping to both OSes from a single codebase — a health app users stick with, realized with BLE integration and React Native.
Health dashboard — activity rings, weight trend, and PFC on one screen