alt Hacker NewsI use Macrofactor (macro tracking app for lifters with good privacy/UI) as a weight/period tracker, and occasional macro tracker. I don't think anybody is going to go to the effort to hack their databases to find the 100 women tracking our periods on it.
The one downside is that they do days since last period as days since the end of your last period, not days since the start, unlike literally every woman and gynecologist ever.
MacroFactor is very rare in the modern software world, probably because it was created by fitness science junkies rather than VCs or engineers. Greg was extremely adamant from the start that they're charging money, take it or leave it, but selling the product itself is all they're ever going to sell. No monetizing user data. No dark patterns to drive engagement and keep you in the app. All they're trying to drive is better lifting and better eating because that's honest to god Greg and Lindsay Nuckols passions in life, not getting rich. Classic lifestyle business that'll never eat the world, but it'll pay the rent in North Carolina for two 40 year-olds with no kids.