Movano Evie Ring: FDA-Cleared Smart Ring Designed for Women’s Health

The first smart ring designed specifically for women’s health, featuring an open-band design that accommodates finger size fluctuations, FDA-cleared SpO2 monitoring, sleep staging, HRV, skin temperature trends, and menstrual cycle pattern tracking at $269 with no subscription.

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The smart ring market has grown rapidly, but virtually every device has been designed with a unisex or male-default approach to sizing, aesthetics, and health feature prioritization. Women experience unique physiological realities, including menstrual cycle-driven fluctuations in finger circumference (up to a full ring size), hormonal influences on heart rate variability and skin temperature, and health priorities around cycle tracking and reproductive wellness, that general-purpose rings address as secondary features at best. A 2023 study published in the Journal of Applied Physiology by Janse de Jonge et al. established that menstrual cycle phase significantly influences thermoregulation, cardiovascular function, and autonomic nervous system activity, with implications for how wearable health data should be interpreted across the cycle (DOI: 10.1152/japplphysiol.00718.2022).

Movano Health developed the Evie Ring as the first smart ring designed from the ground up for women’s health, addressing both the physiological and practical needs that differentiate women’s wearable experiences from the unisex default. The company subsequently received FDA 510(k) clearance for its EvieMED Ring variant with medical-grade SpO2 monitoring, positioning Evie as the first smart ring with an FDA-cleared medical measurement capability.

What Is the Movano Evie Ring?

The Movano Evie Ring is a smart health ring manufactured by Movano Health that combines continuous biometric monitoring with a women-first design philosophy. The ring tracks sleep stages and duration, resting heart rate, heart rate variability (HRV), blood oxygen saturation (SpO2), respiration rate, skin temperature trends, steps, active minutes, and calorie burn. Its companion app correlates these metrics to identify patterns in menstrual cycles, sleep quality, energy levels, mood, and progress toward health goals.

The ring’s signature design feature is its open-band architecture, an industry-first that accommodates the natural fluctuations in finger circumference that women experience due to hormonal changes, fluid retention, temperature variation, and exercise. Traditional closed-band smart rings fit at a single size, which means they may be too tight during luteal phase swelling and too loose during other cycle phases. The open design flexes slightly to maintain sensor contact across these variations.

The Evie Ring is available in gold, rose gold, and silver finishes in sizes 5 through 12, offering aesthetic options designed for women’s jewelry preferences rather than the typically masculine styling of competing rings. The ring features scratch-resistant construction, 4+ days of battery life, and 60-minute recharging.

Movano Health secured FDA 510(k) clearance for the EvieMED variant, which includes medical-grade pulse oximetry. This makes the Evie platform the first smart ring with an FDA-cleared SpO2 measurement capability, distinguishing it from competitors whose SpO2 features are classified as general wellness rather than medical-grade.

The Science Behind Women-Specific Health Monitoring

Women’s physiological parameters vary systematically across the menstrual cycle in ways that affect how health data should be collected and interpreted. Basal body temperature rises 0.3 to 0.5 degrees Celsius after ovulation due to progesterone’s thermogenic effect. Heart rate variability shifts across cycle phases, with higher parasympathetic tone in the follicular phase and relatively reduced HRV in the luteal phase. Resting heart rate increases by 2 to 5 beats per minute in the luteal phase. Sleep architecture changes, with reduced slow-wave sleep during the late luteal phase.

These cycle-driven variations mean that a health ring interpreting data without menstrual cycle context may flag normal luteal-phase changes as concerning or miss genuine anomalies because they coincide with expected cycle variation. By tracking menstrual cycle patterns alongside biometric data, the Evie Ring’s app can contextualize health metrics within the user’s current cycle phase.

Finger circumference variation is a practical challenge that most smart ring manufacturers ignore. Research has documented that finger size can fluctuate by up to one full ring size across the menstrual cycle, with fluid retention during the luteal phase causing noticeable swelling. Temperature changes, exercise-induced vasodilation, and pregnancy can produce even larger variations. A ring that becomes uncomfortably tight or unacceptably loose at different points creates both comfort and measurement reliability problems.

The open-band design addresses this directly, allowing the ring to accommodate circumference changes while maintaining sensor contact with the skin for consistent PPG readings.

What the Movano Evie Ring Does Well

The women-first design philosophy permeates every aspect of the device. The open-band design solving finger size fluctuation is the most tangible innovation, but the app’s menstrual cycle integration, the jewelry-forward aesthetic options, and the health feature prioritization around energy, mood, and cycle patterns reflect a genuine understanding of women’s health monitoring needs rather than a generic tracker with a cycle feature bolted on.

The FDA clearance for SpO2 on the EvieMED variant provides clinical credibility that no other smart ring can claim. FDA-cleared medical measurements carry a higher standard of accuracy validation than general wellness features, and SpO2 monitoring has clinical relevance for conditions including sleep apnea screening, respiratory health assessment, and altitude-related monitoring.

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The $269 price with no subscription positions Evie competitively against the Oura Ring 4 ($349 + $6/month) and Samsung Galaxy Ring ($399). Over two years, the total cost of Evie ownership ($269) compares favorably to Oura ($493) and Samsung ($399).

The 60-minute recharge time and 4+ day battery life provide practical convenience. The fast charging means users can top up during a shower and maintain continuous monitoring without extended charging breaks.

Pricing, Access, and Practical Realities

The Movano Evie Ring is priced at $269 with no subscription fees, available exclusively through eviering.com. The ring comes in gold, rose gold, and silver finishes in sizes 5 through 12. A sizing kit is recommended before purchase to determine optimal fit.

The open-band design, while solving the finger fluctuation problem, may feel different from traditional closed-band rings. Some users may prefer the continuous band aesthetic of competing rings, and the open design’s long-term durability under daily wear conditions is a consideration.

The companion app is available for iOS and Android and provides all health data, insights, and cycle tracking without subscription fees. The app’s women’s health focus means its analytics and insights are tailored to cycle-aware interpretation rather than generic health dashboards.

Who It Is Best For

The Evie Ring is best suited for women who want a smart ring that acknowledges and accommodates the physiological realities of women’s health. Women who have found other smart rings uncomfortable due to finger size fluctuations, aesthetically unsuitable due to masculine styling, or analytically limited due to lack of cycle-aware data interpretation represent the primary audience.

Women who want FDA-cleared SpO2 monitoring in a ring form factor have no other option, making the EvieMED variant unique for users who value medical-grade measurement validation.

Women who prioritize understanding how their menstrual cycle affects their energy, sleep, mood, and overall health will find Evie’s cycle-integrated analytics more relevant than the general health dashboards of competing rings.

How It Compares

Against the Oura Ring 4 ($349 + $6/month), Evie offers a women-specific design, open-band architecture, FDA-cleared SpO2, and lower total cost. Oura offers superior sleep tracking validation, a larger research partnership network, and a more established ecosystem. Oura’s closed-band design does not accommodate finger fluctuations.

Against the Samsung Galaxy Ring ($399), Evie offers a women-first approach, FDA-cleared SpO2, and no subscription versus Samsung’s broader ecosystem integration with Galaxy devices. Samsung’s ring lacks the women-specific design features and cycle-integrated analytics.

Against the Circular Ring 2 ($380+), which offers ECG and AFib detection, Evie offers FDA-cleared SpO2 and women-specific design versus Circular’s medical-grade cardiac monitoring. The devices serve different primary use cases within the smart ring category.

Limitations and Open Questions

The open-band design, while solving finger fluctuation, may affect water resistance ratings and long-term structural durability compared to solid closed-band rings. Users should evaluate the open design’s suitability for their specific lifestyle activities.

The limited size range (5 through 12) covers most women but may not accommodate all finger sizes. The single-width band design means the ring may look proportionally larger on smaller fingers.

Movano Health is a smaller company compared to Oura, Samsung, and other smart ring competitors, which raises questions about long-term software support, ecosystem development, and company stability.

Health data accuracy compared to established competitors has not been extensively independently validated in peer-reviewed research. While the FDA clearance for SpO2 provides validation for that specific metric, the accuracy of sleep staging, HRV, and other wellness metrics relative to competitors deserves independent testing.

What This Means for Your Health

The Evie Ring represents a important acknowledgment that women’s health monitoring requires purpose-built technology, not adapted versions of male-default devices. Within Healthcare Discovery‘s Five Pillars framework, the Evie Ring’s cycle-aware health tracking connects to Sleep (understanding how cycle phase affects sleep quality), Movement (correlating exercise capacity with hormonal phases), Nutrition (tracking how dietary patterns interact with cycle-driven metabolism changes), and Mindset (monitoring mood and energy patterns across the cycle).

The FDA-cleared SpO2 capability adds a clinically meaningful dimension that connects to the broader longevity agenda: blood oxygen monitoring during sleep can flag potential sleep-disordered breathing, a condition that increases cardiovascular risk and is underdiagnosed in women.

Frequently Asked Questions

What is the Movano Evie Ring?
The Evie Ring is a smart health ring designed specifically for women, featuring an open-band design that accommodates finger size fluctuations, FDA-cleared SpO2 monitoring, and cycle-integrated health analytics at $269 with no subscription.

How much does the Evie Ring cost?
$269 with no subscription fees. Available in gold, rose gold, and silver finishes in sizes 5 through 12.

Is the Evie Ring FDA cleared?
The EvieMED variant received FDA 510(k) clearance for medical-grade pulse oximetry (SpO2), making it the first smart ring with an FDA-cleared medical measurement.

What makes the Evie Ring different from Oura?
The Evie Ring features a women-first design with an open band accommodating finger fluctuations, FDA-cleared SpO2, menstrual cycle-integrated analytics, and no subscription ($269 total vs. Oura’s $349 + $6/month). Oura offers stronger sleep tracking validation and a larger research ecosystem.

How long does the Evie Ring battery last?
4+ days of battery life with 60-minute recharging.

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