The first wearable for your hormones
Starting with cortisol, Lume reveals how your body’s rhythm changes across the day, so you can understand the patterns shaping your energy, stress, sleep and recovery.
Your hormones aren’t static. They follow rhythms.
Cortisol rises and falls throughout the day. Lume reveals the pattern, so you can see when you're on track, and when it starts to shift.
See your rhythms, then use them.
Lume makes those changes visible, so you can:
Insights, when you can act on them.
Knowing your cortisol level is useful. Knowing how it’s changing, and what to do next, is where it becomes actionable.
What members of Lume’s early access programs are saying:
A team that knows wearables.
Decades of experience from Apple to Withings turning complex technology into products that work on real bodies.
Vicki Powell
CEO and Co-Founder
Vicki spent four years as a Product Design Engineer at Apple, prototyping the sensors inside AirPods, Watch, and iPhone– work that earned her multiple sensing patents.
Dr. Jonathan Moustakis
CTO and Co-Founder
Jonathan is an award-winning physician whose years on the front lines made one thing clear: the most important health signals are the ones we never see between checkups.
Questions, answered.
Cortisol is your body's main stress hormone, but it also plays an important role in your circadian health. It shapes your energy, focus, sleep, and mood throughout the day. When its rhythm is off, you can feel “flat" or “off” because your body's chemistry is out of balance.
Hours aren't the whole story. Cortisol should rise in the morning and fall at night. When that pattern shifts, sleep doesn't restore our energy in the same way.
Yes. Elevated cortisol changes how your body regulates appetite, stores fat, and metabolizes glucose. That's partly why it can feel that your weight is stuck when you are doing all the right things.
Struggling to wake up. Waking at 3am and not getting back to sleep. Feeling "tired but wired." Afternoon energy crashes. Weight that won't budge. Or just not feeling like yourself. Everyone's pattern is different, which is why seeing your own matters.
Your circadian rhythm is your body's internal ~24-hour clock. It governs many of your body's processes including when hormones like cortisol rise and fall, sleep, energy, and metabolism, which is why tracking it can reveal so much about why your days feel the way they do.
No. Most wearables estimate "stress" from heart rate and compare you with population averages. Lume is built around cortisol itself, and a few of your own saliva samples calibrate it, so what you see is your rhythm, not an average. It adds to the wearable you already have instead of replacing it. Next, we're building toward reading cortisol directly from sweat, the same direct approach a continuous glucose monitor takes, without the needle.
Yes, and the field is moving fast. Sweat carries hormones like cortisol, and research groups, including scientists on our team, have built sensors that detect them without blood draws or lab visits. Lume's first product estimates your cortisol rhythm from wearable signals, calibrated to gold standard cortisol measurement from your saliva samples, while our lab develops sensors that read cortisol directly from sweat.
A typical blood or saliva test gives you one data point. Lume shows the pattern: how cortisol moves across your whole day, not a single reading. And that's where most of the important information lives.
Be one of the first to experience Lume.
See your cortisol rhythm. Understand what moves it. Know what to do next.