best period tracking app? pcos

I use Flo and Stardust, Flo used to be spot on, but is super inaccurate now and basically pointless since it just says “May start today” every morning until I actually log it in as started.

I just started using Stardust so I’m not sure if it’s accurate.

I have PCOS and want to have the most accurate tracking app that there is. Any recommendations?