The NZ Covid Tracer app source code is here: github.com/minhealthnz/nzcovidtracer-app
and some nice documentation too: github.com/minhealthnz/nzcovidtracer-docs
and some nice documentation too: github.com/minhealthnz/nzcovidtracer-docs
Please use the app! There are good reasons to use it, and no good reasons not to.