SmartScale was another personal app project I hacked on for a while but never released. (I'm still really fond of this UI). The idea was a "smart" weight-tracking app that made it easy to see progress of a weight loss journey. Daily weight fluctuates a lot, and it's sometimes discouraging to see wild swings. The truth is easier to see when you smooth out the data to show the hidden trend line underneath.
The app synced with Withings' smart scale api to download your data automatically, but also had a nice manual entry keyboard. I felt like I really upped my game and got very good at shading buttons. (If I do say so myself) 😅
While I never shipped this one, the work I did here planted the seeds in my mind to start exploring Fitness software more broadly, and eventually led to starting work on Helium.