Opsin: Circadian Sun & Sleep

Opsin syncs your day with the sun.

Most health apps hand you more numbers. Opsin does the opposite — it tells you the one thing to do for your circadian rhythm right now, then shows you it worked in your own sleep and recovery. Light sets your body clock. Opsin sets your light.

WHAT OPSIN DOES

• Live sun times and your daily light windows — morning light, vitamin D window, blue hour, and bedtime, calculated for your exact location and updated automatically all year.
• A real, dynamic dawn alarm — recalculates to civil dawn every night, so you wake into the light without ever resetting a thing.
• See what morning light does to you — Opsin reads your sleep and HRV from Apple Health and reflects the difference light makes in your own body.
• Jet-lag plans with exact clock times — shift your body clock before you fly, so you land already adjusted.
• Your lights, automatically on sun time — optional HomeKit support.

WHY IT MATTERS

A regulated circadian rhythm is the foundation under sleep, energy, and mood. Instead of highlighting downstream problems, Opsin addresses the behavior at the root — and makes it effortless.

PRIVATE BY DESIGN

No account. No backend. Your health and location data are processed entirely on your device and never leave your phone.

SUBSCRIPTION

Opsin Premium unlocks every feature. $9.99/month or $79/year, each with a 7-day free trial. Payment is charged to your Apple ID; subscriptions renew automatically unless canceled at least 24 hours before the period ends. Manage or cancel anytime in your App Store settings.

Opsin is a general wellness and educational tool. It is not a medical device and does not diagnose, treat, or prevent any condition. Consult a qualified professional for medical concerns.

Scripture quotations taken from the New American Standard Bible® (NASB), Copyright © 1960, 1971, 1977, 1995 by The Lockman Foundation. Used by permission. www.Lockman.org

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