Ovulation timing

How does one know off apps what day they ovulate, when i have a few different apps and they give me about 2 week period between all of them. *pic shows key to what apps and dates* square is sex, red line is period and then key is to the right to say which apps. Or if anyone had certain luck with one app more then others. Just looking for guidance since it gives me such.a variety of dates.

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