Gut Log: I cut the streaks
Gut Log is a dead-simple eat/water/gut tracker with a Bristol scale and a CSV export your doctor can actually read.
The interesting decision was what to remove: streaks, badges, daily reminders that exist to farm opens. If you skip three days, the data is still useful. Engagement mechanics on a health log optimize the wrong metric.
Locked philosophy for this one: measure the gut, not the app.