For decades, wearables have been built on male-centered biology — assuming your body operates the
same way every day.
Women's bodies don't work like that.
Women’s health is shaped by dynamic biological rhythms — from the daily circadian cycle to monthly hormonal fluctuations and lifelong physiological transitions.
Your heart rate, body temperature, HRV, and sleep stages shift every week of your cycle — there is no single "baseline"
The same workout, the same sleep schedule, the same diet produce different outcomes depending on your hormonal phase
Life phases — pregnancy, postpartum, perimenopause — require entirely different models, not just adjusted thresholds
CURV's Rhythm Intelligence is a female-first model built to decode your biological rhythms and deliver health insights that adapt to your body. By combining continuous physiological sensing, menstrual cycle science, and AI-powered interpretation, CURV helps women understand their bodies — not just measure them.
Meet the three biological rhythms —— the multi-layered timing system that drives women's health
The Daily Rhythm (Circadian)
Your 24-hour cycle of cortisol, melatonin, and body temperature. It controls when you feel alert, when you sleep, and how you recover. In women, this rhythm shifts across the month in ways that traditional health models often overlook.
The Monthly Rhythm (Menstrual)
A 21–35 day hormonal cascade that doesn't just control your period — it reshapes your sleep, metabolism, immune function, mood, and brain chemistry every single month.
The Life Rhythm (Life Phase)
From puberty to postmenopause, your body moves through fundamentally different operating states — each with its own rhythmic signature that changes how the other two layers behave.CURV is designed to evolve with you through every stage of womanhood.
These three rhythms interact, overlap, and shape each other. CURV's Rhythm Intelligence™ reveals how your rhythms influence your sleep, energy, mood, and health — creating a complete picture of your wellbeing.
Your rhythms influence how you feel, perform, recover, and connect with yourself.
Here's how your three rhythms show up across every dimension of your daily life:
Menstrual Cycle & Hormones
The menstrual cycle is not a single event — it is a 21–35 day hormonal cascade that reorganizes nearly every physiological system. Estradiol, progesterone, LH, and FSH rise and fall in a coordinated sequence, altering thermoregulation, immune activity, neurotransmitter synthesis, and metabolic substrate use. Each phase — follicular, ovulatory, luteal, menstrual — creates a distinct internal environment.
These hormonal shifts produce real, measurable symptoms: breast tenderness, pelvic cramping, headaches, water retention, acne flares, joint laxity, temperature elevation, and changes in cervical mucus — all signals of a system in constant transition. What women often dismiss as "random bad days" are predictable consequences of where they sit in this cascade.
CURV's Rhythm Intelligence maps your position within this hormonal sequence and interprets your
biometrics accordingly — turning isolated symptoms into a coherent physiological narrative.
Sleep & Recovery
Hormonal changes can alter your sleep quality throughout the cycle. Estrogen withdrawal around menstruation disrupts sleep onset latency. Progesterone elevation in the luteal phase reduces slow-wave sleep duration, increases nighttime awakenings, and raises core body temperature — all of which degrade sleep efficiency. During life phase transitions — perimenopause, postpartum — circadian alignment itself becomes unstable, and sleep fragmentation can persist for months.
CURV identifies these hormonally-driven sleep changes and distinguishes them — gives you an accurate picture of what's driving your sleep quality and where recovery is truly compromised.
Mood & Stress
Your emotions are meaningful signals from a changing biological system.
Ovarian hormones are neuroactive. Estradiol modulates serotonin and dopamine receptor density; Progesterone metabolites (allopregnanolone) act directly on GABA-A receptors. When these hormones shift rapidly — particularly in the late luteal phase — the neurochemical environment changes within days, creating vulnerability windows for mood instability, irritability, anxiety, and heightened stress reactivity.
CURV correlates your physiological stress markers with cycle phase, making the hormonal signal visible within what otherwise feels random and helping you distinguish a hard day from a hard phase.
Energy, Metabolism & Movement
Some women may experience changes in exercise capacity and perceived energy across cycle phases.Estradiol promotes glucose uptake, supports mitochondrial efficiency, and enhances exercise motivation. Progesterone-dominant phases may influence substrate use, glucose regulation, and perceived effort during exercise. Training without accounting for this means you're either under-recovering or under-performing — without knowing why.
CURV tracks your energy and activity patterns relative to your cycle phase — helping you recognize when your body may be ready to push, adapt, or recover.
Appetite, Gut & Nutrition
Estradiol suppresses appetite via hypothalamic signaling. When it declines in the luteal phase, this restraint is reduced — caloric drive increases by an estimated 100–300 kcal/day, with heightened preference for carbohydrate and fat-dense foods. Simultaneously, progesterone slows gastrointestinal motility, contributing to bloating, altered bowel patterns, and changes in nutrient absorption timing. Micronutrient demands also shift across the cycle — iron loss during menstruation, increased magnesium utilization in the luteal phase, and fluctuating B6 requirements that support progesterone metabolism.
CURV contextualizes your appetite, digestive, and nutritional shifts within your hormonal pattern — reframing them as predictable physiology rather than behavioral failure.
Cognition & Focus
Estradiol enhances prefrontal cortex activity, supporting working memory, verbal fluency, and executive function. Progesterone can dampen cognitive processing speed and reduce attention control. Research documents measurable shifts in attention and memory performance across cycle phases — including the "brain fog" many women report in the late luteal phase.These changes do not mean you are losing ability — they reflect temporary shifts in how your brain works.
CURV helps estimate your cognitive readiness by integrating sleep quality, HRV, and cycle patterns.— helping you align high-demand tasks with your phases of peak mental clarity.
CURV understands your health through two dimensions — Body and Mind — connected by one underlying engine: your Rhythm. Every metric is interpreted relative to where you are in your cycle, your day, and your life phase.
CURV reads your health through two dimensions — Body and Mind — connected by one underlying engine:
your Rhythm. Every metric is interpreted relative to where you are in your cycle, your day, and your, life phase.
Body — how you sleep, move, digest, energize, and recover.
Mind — how you feel, focus, and handle stress.
Rhythm — the hormonal timing system that explains why both shift.
This is Body-Mind Balance — not a static score, but a dynamic understanding of how your whole system finds equilibrium. CURV doesn't just show you what's happening — it shows you why, and how to find
your balance.
Sense ——Continuous, Whole-Body Tracking
CURV integrates combines 24/7 physiological sensing with a complete female symptom logging system — capturing both what your body is doing and what you're experiencing.
What CURV measures :
An advanced sensor array built into a single ring — optical PPG, infrared thermometer, and 6-axis
motion sensing — continuously capturing:
Sleep quality & recovery
Heart rate & HRV
Stress & resilience
Body temperature & cycle phase
Activity & energy expenditure
Blood oxygen & respiratory rate
What CURV tracks:
Period & fertility — flow, clots, color, spotting, discharge, ovulation signs
Symptoms — pain, bloating, breast tenderness, skin changes, cravings, digestive shifts
Mood & energy — energy level, mood state, mood triggers
Daily context — water intake, caffeine, supplements, exercise, stress events, weight trend
Understand — Your Personal Rhythm Intelligence
Built on female-first data — our models are trained exclusively on women's physiological datasets
and validated peer-reviewed female health research.
CURV's AI doesn't compare you to population averages. It builds your unique baseline — and watches how it
evolves.
Personal baseline modeling:
Your metrics from cycle to cycle are compared against yourself — not a generic 28-day template. CURV learns your unique cycle length, your typical HRV range in each phase, your temperature shift pattern, and your individual sleep architecture.
Cross-cycle pattern recognition:
The AI identifies recurring signatures across your rhythm layers — detecting which symptoms cluster together, which phases are your vulnerability windows, and how your patterns shift over months.
Early shift detection:
By learning your personal norms, CURV detects deviations before they become symptoms — flagging when
your rhythm is drifting from its usual pattern, so you can respond early rather than react late.
Powered by adaptive AI:
CURV's rhythm engine combines time-series analysis, cycle-phase segmentation, and multi-signal correlation — continuously learning from your data. The longer you wear it, the smarter it gets.
Guide — Actionable, Science-Backed Insights
Based on where you are in your rhythms right now, CURV delivers personalized guidance that adapts to
your body's current state:
- Nutrition — micronutrient and macronutrient timing aligned with your metabolic shifts
- Movement — exercise intensity recommendations matched to your hormonal energy arc
- Recovery — when to prioritize rest based on your HRV trend and cycle phase
- Skincare — Routine adapted to hormonal skin changes across your cycle
- Mental load — when to schedule demanding cognitive work vs. lighter tasks
Every recommendation is generated from your personal rhythm model — your data, your patterns, your current phase. It updates daily as your body moves through its rhythms.
