TrackMyWeight
A local-first fitness and nutrition tracker for Android, built on a food database written for the people using it rather than translated for them.
Nutrition trackers assume a food database that does not contain what most of the world eats. This one is built around Benin and West African cuisine from the start, which is a data problem before it is an interface problem.
The app is fully usable with no network. That is not a line on a specification sheet but the condition for it being used at all.