Ultrahuman Ring Air Adds Non-Invasive Ovulation Tracking

Teladoc recently acquired viO HealthTech, creator of the OvuSense algorithm, backed by 15 years of research and 260,000+ medical-grade sensor cycles.

Ultrahuman has adapted an intravaginal fertility algorithm into a non-invasive, temperature-based feature that tracks menstrual cycles from the finger.

The company recently acquired viO HealthTech, creator of the OvuSense algorithm. This algorithm has been validated in 13 peer-reviewed publications and is backed by 15 years of clinical research using data from over 260,000 cycles collected with medical-grade sensors.

“This collaboration benefits from 15 years of clinically proven women's health expertise and applies it to the world's lightest smart ring,” said Mohit Kumar, Ultrahuman CEO. “For the first time, best-in-class hardware, software, and algorithms with a clinical background come together in one wellness device. Our mission is to give women cutting-edge tools to optimize their health, combining clinical technology with comfort and style to deliver the most accurate women's health tool available.”

Previously deployed in class II intravaginal fertility monitors, the OvuSense algorithm now powers the Cycle and Ovulation Pro PowerPlug for Ultrahuman’s Ring Air smart ring. Ultrahuman said the feature achieves over 90% accuracy in confirming ovulation, based on equivalence testing comparing OvuSense and Ring Air with a multi-hormone ovulation prediction method tracking luteinizing hormone and progesterone rises.

“Most platforms that track menstrual cycles rely on a 28-day cycle, but Cycle and Ovulation Pro takes into consideration that 87% of people who menstruate have varying cycles due to conditions such as polycystic ovary syndrome, endometriosis, non-bleeding, thyroid disorders, or irregular bleeding,” the company said.

The Pro version complements the free Cycle and Ovulation PowerPlug, offering fertility planning and cycle insights. Using temperature biomarkers captured by the Ring Air, it can flag early or late ovulation, short luteal phases, or trends linked to PCOS or miscarriage risk. Users can also log mood, symptoms, and behaviors for personalized insights.

While the OvuSense algorithm is FDA-cleared for intravaginal use, the non-invasive Ring Air version is designed for general wellness and is not FDA-cleared. It is not a substitute for contraception or professional medical advice.

Cycle and Ovulation Pro is available in the US, UK, EU, Australia, and Canada at $3.99 per month or $39.99 per year. The original Cycle and Ovulation PowerPlug remains free.

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