coming soon to iPhone
Sleep scores tell you what went wrong. Opsin tells you what to do about it — one clear action a day, matched to your sun, proven in your own sleep and recovery.
the root, not the symptom
Every cell in your body runs on a roughly 24-hour clock, and a master clock in your brain keeps them aligned. The signal it depends on most is light — the right light, at the right time of day.
A regulated circadian rhythm is foundational to health — as fundamental as what you eat or how you move. When its timing drifts — from dim mornings, bright nights, screens, shift work, travel — every clock in the body falls out of step. And a growing body of research points to circadian dysfunction as a major, arguably driving, factor in the development of chronic disease: poor sleep, low energy, mood disturbance, metabolic dysfunction, blood-sugar and cardiovascular strain, blunted focus, weakened immunity and recovery.
Treat each of those as its own separate problem and you end up managing symptoms forever. Address the timing underneath them, and you're working on the cause.
Most tools hand you more data about the problem. Opsin gives you a behavioral solution — and fewer numbers to carry.
Opsin is a general wellness app, not a medical device, and does not diagnose, treat, or cure any condition.
why Opsin is different
Light sets your clock. Opsin sets your light.
what's inside
Civil dawn, sunrise, golden hour, and sunset — calculated on your device for your exact location, with a living sky that moves as the sun does.
Not a wall of metrics — the single most useful thing to do for your rhythm right now, and how to do it.
Build the habit that anchors everything. Log your time outside, back-date a day you missed, and watch the streak grow.
Connect Apple Health and see how your sleep and recovery compare on days you got morning light versus days you didn't.
An alarm that tracks the sunrise and re-times itself as the seasons change — so you wake into the light, not against it.
Enter a trip and get a day-by-day plan with the exact clock times to sleep, wake, and seek or avoid light. No math required.
Connect Apple HomeKit and Opsin warms your lights at dusk and brightens them at dawn — automatically.
A simple setup that reddens your phone after sunset to protect your evening melatonin and wind-down.
A quick assessment places you as a morning, evening, or intermediate type — and tailors your guidance to it.
An optional word of light, rest, and hope each morning — 365 verses, chosen to meet the day.
Your data stays on your device. No account required. Nothing sold, ever.
Your next light window at a glance on the home screen, and hands-free logging through Siri.
why I built it
Across years in cardiology and functional medicine, the same root kept surfacing: a rhythm out of sync with the sun sits underneath so much of how we feel. Every tool I found just handed people more data about the problem. None of them fixed the cause. So I built the one I wanted them to have.
coming soon to iPhone
Join the waitlist and we'll let you know the moment Opsin is on the App Store.
Join the waitlistNo spam — one note when Opsin launches. Your email is never sold.