Are there any period tracking apps that are single-purchase, NO CLOUD DATA, NO HEALTHKIT, privacy respecting at all? My daughter is getting to the age where she should probably start tracking mood so she might have some warning for when she starts fully menstruating, but I'm deeply concerned about the 3rd party doctrine and apps like Clue collaborating with the fascists.

If not, why not? Is there something I'm missing? Is this a thing I should consider during my down times in my consulting biz?

Thanks! and please boost widely!