TL;DR
Natural Cycles has unveiled a wristband priced at $129.99 intended to replace the thermometer used with its controversial, FDA-cleared birth control app. The band measures skin temperature, heart rate and movement during sleep and syncs with the app’s algorithm to determine a user’s daily fertility status.
What happened
Natural Cycles, the company known for its FDA-cleared birth control app, announced a new wristband that the company says will take the place of the traditional thermometer used with its service. The wearable collects skin temperature, heart rate and movement data overnight, then transmits that information to the Natural Cycles app. The app applies its algorithm to the incoming data to produce a “daily fertility status” for the user. The wristband is being sold for $129.99 and is positioned to work with the existing Natural Cycles software. The published excerpt notes users can already track fertility by pairing the app with a device, but the remainder of that sentence and additional pairing or compatibility details are not confirmed in the source.
Why it matters
- Shifts fertility monitoring from manual thermometer readings to continuous overnight wearable data collection.
- Integration of heart rate and movement data could change how the app’s algorithm interprets fertility signals.
- The device ties into an FDA-cleared app, which may influence user trust and regulatory scrutiny.
- Cost and adoption could affect accessibility for people who previously used simpler, cheaper thermometers.
Key facts
- Natural Cycles released a wristband that the company says replaces the thermometer used with its app.
- The band measures skin temperature, heart rate and movement during sleep.
- It syncs with the Natural Cycles app, which uses an algorithm to determine a user’s daily fertility status.
- The wristband is priced at $129.99.
- Natural Cycles’ app is described in the source as FDA-cleared and controversial.
- The product launch was reported in a published article excerpt dated January 15, 2026.
- Details about pairing, exact available markets, and full technical specifications are not provided in the excerpt.
What to watch next
- Comparative accuracy of the wristband versus traditional basal body thermometers: not confirmed in the source.
- Whether regulatory bodies or independent studies validate the wristband’s measurements and algorithm integration: not confirmed in the source.
- Availability, shipping regions, and compatibility with different phones or versions of the Natural Cycles app: not confirmed in the source.
Quick glossary
- Basal body temperature: The body’s resting temperature, often measured upon waking and used in fertility tracking.
- FDA clearance: A regulatory status indicating the U.S. Food and Drug Administration has reviewed and allowed marketing of certain medical devices or software based on evidence of safety and effectiveness for intended use.
- Algorithm: A set of computational rules or procedures used to analyze data and produce outputs, such as determining fertility status from physiological inputs.
- Wearable: A device worn on the body that collects data such as movement, heart rate, or temperature.
Reader FAQ
Does the wristband replace the thermometer for Natural Cycles users?
According to the source, Natural Cycles is replacing the thermometer with the new wristband.
How much does the wristband cost?
The wristband is priced at $129.99.
What does the wristband measure?
The band measures skin temperature, heart rate and movement during sleep and syncs data to the app.
Is the effectiveness of the wristband for birth control confirmed?
Not confirmed in the source.
Natural Cycles, the company behind a controversial FDA-cleared birth control app, is replacing its thermometer with a wristband that measures skin temperature, heart rate, and movement during sleep. The newly-launched…
Sources
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