Can your phone prevent pregnancy? flo app trial recruits 3,800 women
NCT ID NCT07630064
First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study is testing whether the Flo app, when used with an Apple Watch that measures wrist temperature overnight, can help women prevent pregnancy without hormones or devices. About 3,800 women in the US will use the app as their only birth control for up to 13 cycles. The app tells them which days they are fertile and should use protection.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Flo Digital Contraceptive app (software as a medical device) used with an Apple Watch for temperature tracking
What this could lead to
If successful, this could provide a hormone-free, non-invasive contraceptive option that helps women prevent pregnancy using only their smartphone and a smartwatch.
What could go wrong
This is a single-arm study with no comparison group, and effectiveness depends on consistent daily use. The app may not work as well for women with irregular cycles or those who forget to wear the watch.
Disclaimer
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the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Study contacts
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Locations
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Lindus Health
RECRUITINGBoston, Massachusetts, 02111, United States
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