Apple patents wearable that predicts periods using heart rate
Apple has filed a patent for a wearable device that estimates menstrual cycles and fertility windows by analyzing heart rate data. The system improves its predictions over time by comparing its estimates with dates the user manually logs for their periods.
In the filing’s own words
A mechanism for estimating windows for menstrual cycles and fertility. The mechanism tracks menstrual cycles based on accuracy of predictions as compared to user input logging the start and stop of a cycle; this user input and the accuracy of prior cycle predictions is used to improve and update future predictions. Thus, as the mechanism receives additional data, it refines its predicted fertility window and period. A user’s heart rate may be used to estimate fertility windows, periods, and other portions of a menstrual cycle.
What exactly they claim (claim 1)
1. A wearable device for estimating portions of a menstrual cycle, comprising: a calendar module; a heart rate sensor; a preprocessing module operative to: receive an initial period estimate from the calendar; receive heart rate data from the heart rate sensor; and process the initial period estimate and heart rate data into a processed data set; an ovulation estimator operative to: receive the processed data set from the preprocessing module; and use the processed data set to estimate a fertility window; and a period estimator operative to: receive the processed data set and an output from the ovulation estimator; and use the processed data set and the output from the ovulation estimator to estimate a period date.
Facts
- Company
- Apple (Apple Inc.)
- Official title
- MENSTRUAL CYCLE TRACKING AND PREDICTION
- Publication number
- US20260306074A1
- Application number
- 19715671
- Filed
- Jun 22, 2026
- Published
- Oct 8, 2026
- Inventors
- 7
- Claims
- 20
Classified under
A61B 10/0012 Human necessitiesA61B 5/024 Human necessitiesA61B 5/6801 Human necessitiesA61B 5/7264 Human necessitiesMore from Apple in Wearables
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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.