Natural Cycles expands from fertility to perimenopause support

Natural Cycles is expanding beyond birth control with NC° Perimenopause, a new app mode designed to help users track and understand hormonal changes during perimenopause. The update launches alongside the NC° Band, a wearable that collects overnight biometric data including temperature and heart rate.

What NC° Perimenopause does

The app uses the NC° Menopause Algorithm — what the company calls a first-of-its-kind system — to analyze cycle patterns, symptoms, and biometric data. It assesses which stage of perimenopause a user may be in (early, mid, or late) and delivers daily insights based on temperature trends and symptom tracking.

Natural Cycles’ science team in Geneva developed the algorithm using data from clinical studies of perimenopausal women, published research, and guidance from menopause specialists.

The timing reflects demand. In a survey of nearly 5,000 Natural Cycles users over 40, more than 90% reported low to medium knowledge of menopause, and four out of five said they needed more information and support around perimenopause symptoms.

How it works

Users measure temperature overnight using the NC° Band, Oura Ring, or Apple Watch. The app syncs data automatically and provides daily insights that help identify patterns and irregularities as hormones shift. Over time, consistent tracking reveals connections between symptoms and hormonal changes.

The app also includes advanced cycle and symptom analysis, letting users log experiences like mood changes, sleep disruptions, or irregular periods and see how they correlate with their biometric data. NC° Perimenopause is the fifth mode available under a single Natural Cycles subscription, joining Birth Control, Plan Pregnancy, Follow Pregnancy, and Postpartum.

The NC° Band

The NC° Band is Natural Cycles’ first proprietary wearable. It tracks overnight temperature and heart rate, syncing directly with the app. It’s designed to integrate with the company’s existing algorithm, which already supports data from Oura Ring and Apple Watch.

Where to get it

NC° Perimenopause and the NC° Band are available now through the Natural Cycles app and at naturalcycles.com. The app requires a subscription; visit the site for current pricing.