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Investor Overview · 2026
A 30-day patch that reads estradiol, progesterone, LH, and cortisol directly from passive sweat. Continuous. Noninvasive.
The Problem
Hormones govern every system that defines a woman's health.
Yet no product has ever given her a continuous window into them.
Invasive and accurate — or continuous and inferring. Until now, you had to choose.
The Solution
FemSync is a discreet, 30-day wearable patch that continuously measures estradiol, progesterone, LH, and cortisol directly from tiny amounts of passive sweat. No needles, no effort, no gaps in the data.
Small, imperceptible patch worn anywhere on the body. Designed to disappear into daily life — waterproof, discreet, and replaced every 30 days.
Estradiol, Progesterone, LH, and Cortisol are measured automatically from passive sweat produced 24/7, multiple times a day.
Data syncs to an app that builds her unique hormonal fingerprint — connecting symptoms, cycles, and patterns no snapshot test could ever reveal.
Designed for the complete arc of a woman's hormonal life — from first period to fertility, perimenopause, and beyond.
The Product
The patch collects the data no one has ever had. The FemSync app is where it becomes actionable.
The FemSync app translates hormone data into AI-driven, personalized insights, synced with existing wearables, so women can connect symptoms to answers and act.
At scale, this becomes something larger: the world's first continuous, longitudinal hormone dataset.
How It Works
Four steps. No clinical visits. No disruption to daily life.
Small, flexible, worn anywhere. Passive sweat is produced continuously — FemSync listens.
Synthetic DNA engineered to bind each hormone fires an electrical signal on contact. Twice daily. Automatically.
AI maps hormone patterns over time — connecting what you feel to what your body is actually doing.
After 30 days, replace the patch. Every cycle adds to the individual model. Every cycle, the insights get sharper.
Impact
Track your actual cycle — no matter how irregular. Sleep, feel, and train better. Plan your family. Understand and manage your symptoms. Finally have real data your doctors can’t dismiss.
That's a game changer for the hundreds of millions of women struggling with PCOS, PMDD, endometriosis, perimenopause, metabolic disease, Alzheimer's, and autoimmunity. And it opens new ground for fertility tracking and the most accurate non-hormonal birth control tool ever built.
No continuous hormone dataset at scale has ever existed. Until now. FemSync's dataset can transform clinical trial design, enable predictive diagnostics, and train AI models that improve with every cycle. Licensing value extends to health systems, insurers, and pharma partners. Think Dexcom for glucose. FemSync is the same shift for biomolecules that govern the health of 2 billion women.
The Science
Hormones circulate at concentrations so low (a trillionth of a gram per liter) that no wearable in history had ever detected them. Until now.
FemSync's patented aptamer-field-effect transistors use engineered DNA sequences that lock onto specific hormones and convert that contact into a readable electrical signal with a level of sensitivity existing sensors can't approach. The device reads from passive sweat on the skin surface. No needles, no lab, no delay.
In 2022, Dr. Andrews' team published proof in Science Advances: the world's first smartwatch to continuously measure cortisol from passive sweat in living humans. FemSync is that same platform, extended to the female reproductive hormone panel.
Published research
Working prototype
The track record
Competitive Position
| Solution | Quantitative hormones | Continuous | Non-invasive | Cost-effective |
|---|---|---|---|---|
| ✦ FemSync | ✓ | ✓ | ✓ | ✓ |
| Period tracking apps (Clue, Natural Cycles) | — | — | ✓ | ✓ |
| Wearables (Oura, Whoop, Clair) | — | ✓ | ✓ | — |
| Hormone monitors (Level Zero) | unproven | ✓ | — | — |
| Blood tests | ✓ | — | — | — |
| At-home urine tests | ✓ | — | ✓ | — |
Technology
Three core properties — all confirmed. This is not a concept. It is a working technology that has been validated in human subjects.
Our sensors detect hormones at the picomolar level — the same concentrations found in passive sweat. Orders of magnitude beyond any existing wearable sensor.
No needles. No blood. Hormones are measured passively from sweat produced continuously by the body — no action required from the wearer.
Reversible aptamer sensors that monitor hormone levels across a full 30-day cycle — capturing the complete hormonal picture, not just a moment in time.
The Raise & Roadmap
Funding goes directly toward device validation, engineering, and FDA groundwork — the milestones that de-risk the platform and open the seed round.
The Team
The moat is the person. Dr. Andrews spent 20 years building the science that makes FemSync possible — and she is the founder.
Dr. Andrews' lab at UCLA spent 20 years and $10M in NIH and other non-dilutive funding building the exact science behind FemSync — pioneering aptamer-field-effect transistors from first principles, publishing in Science and American Chemical Society, and validating the technology in humans. FemSync holds exclusive licensing rights to her 4 UCLA patents.