Which app do you find the most accurate?

Jessica

I am using this app, Flo and pre-mom. All 3 have different ovulation dates. I was tracking according to Flo and then ran out of ovulation tests. Pre mom says I ovulated on the 12th while Glow says the 5th and Flo says the 7th. Which one do you girls notice is more accurate? I know it’s never a sure thing without tracking but I’m curious.