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Most cycle-tracking apps predict ovulation based on a one-size-fits-all model — it’s commonly thought that ovulation happens on day 14 of a standard 28 day-cycle.
However, for majority of people with ovaries, that’s not the case3. In fact, one study found that the probability of correctly identifying a woman's ovulation day using cycle-tracking apps was as low as 21%1.
Sep 3, 2026