I'm sorry if I misgendered you. I was already exhausted from the other comments that clearly state that they are men and probably was biased in that regard. But my point still stands that there is no reason to completely forego tracking apps.
ValiantDust
Drip, the app mentioned several times in this thread, let's you encrypt the locally stored database with a password you have to enter every time you open the app. How is that not safer than a random piece of paper?
It's so exhausting that this thread is full of men telling women what they should and shouldn't do while having very little knowledge about the topic.
Do people need an app for taking notes? Or a calendar?
Sure, I used to do it on paper for many years. But it's much more convenient to track it on my phone, which I have almost always with me. That way I can check whether I'm likely to be bleeding heavily before making plans with my friends to go swimming that day or on a long hike without access to a toilet.
Also many women don't just track the blood flow but also other data like temperature, cervix and cervical mucus. This helps calculate the most fertile days. It's much easier to let an app do that.
I get that. It shouldn't be necessary to do research just to be sure it's safe. I apologise for my aggressive tone. It must be really scary and exhausting to live somewhere like that. My country is still holding up but seems to be sliding slowly in that direction too.
So do whatever makes you stay safe and feel safe.