Two period apps

Larissa • SAHM #GirlMoM 🎀09/01/17•🎀05/18/20 👼10/2021•🎀 09/18/2022🌈

Not sure which app is more accurate this one says AF in 4 days other one says 6 days 🤔 both apps have their benefits and pros and cons but which one should i rely on more ....?