Why sbu.dev
You look for a level on your iPhone and find paid apps. You look for a way to track habits and find subscriptions. These are simple jobs your phone can already do.
sbu.dev makes a free app for each of these jobs, one by one. Each Sbu app does one thing, is free and asks nothing of you: no account, no ads, no data leaving your iPhone.
The first two are Sbu Level, a bubble level and clinometer, and Sbu Habits, for habits and days in a row.