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Opsin: Circadian Sun & Sleep

Opsin: Circadian Sun & Sleep

Sunlight timing, better sleep

5 ratings
3 reviews
🌟 Lifestyle
💪 Health & Fitness
Free
In-App Purchases

Details

Released
August 4, 2026
Updated
September 26, 2026

Features

Developer

Opsin App LLC
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About

This app helps regulate your body's natural clock by syncing your daily activities with the sun. It provides personalized light timing windows, a dynamic dawn alarm, and tracks the impact of light on your sleep and recovery. Jet-lag plans and optional smart home integration are also available.

✓Live sun times and light windows
✓Dynamic dawn alarm
✓Sleep and HRV tracking integration
✓Jet-lag adjustment plans
✓HomeKit support
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What's New in Opsin

1.4

September 26, 2026

Opsin now works anywhere on Earth. • Weather and UV wherever you are. Outside the US, Opsin now uses Apple Weather for live conditions and UV, so your vitamin D window and sun guidance stay accurate abroad. • Travel-aware. Land in a new time zone and Opsin retimes your sun windows, alarms, and meal window automatically. • Built for extreme latitudes. Under the midnight sun or in polar night, Opsin switches to honest, clock-anchored guidance instead of going blank. • Stability and accuracy improvements.

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Subscriptions & In-App Purchases

Opsin Premium (Monthly)

Full access to every Opsin feature

$9.991 Month
7 Days trial
How to cancel Opsin subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Love this app!

This app makes getting my morning sun so easy, sending reminders! and also reminds me in the evening when I need to turn off my blue light so that my body can start making melatonin so I can get better sleep. Highly recommend for anyone and everyone.
DDDtown dirty

Essential for my Health

Opsin has been incredible for my health. I’ve noticed a huge difference in my energy and the way I feel. No more afternoon slump. I feel more motivated. I procrastinate less. I love all of the extra features and I especially love the daily Bible verses!! So glad I found this app!
KKelSal12345

Excellent for tracking sun

Opsin makes sunrise, light exposure, and sleep guidance easy to understand. The app feels pretty intuitive, and the dawn alarm and jet-lag tools seem especially useful.
GGrassgreener3

Developer apps

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FAQ

What is Opsin's core function?

Opsin's core function is to help users regulate their circadian rhythm by providing personalized sunlight timing information and guidance. It focuses on optimizing light exposure throughout the day to improve sleep, energy, and mood.

How does Opsin use my data?

Opsin is designed with privacy in mind. Your health and location data are processed entirely on your device and never leave your phone, as the app has no account or backend.

What are the subscription options for Opsin Premium?

Opsin Premium offers two subscription plans: $9.99 per month or $79 per year. Both plans include a 7-day free trial and can be managed or canceled anytime through your App Store settings.

Does Opsin have ads?

No, Opsin does not contain advertisements. The app is free to download and use, with an optional premium subscription for advanced features.

How does Opsin's dawn alarm work?

Opsin features a dynamic dawn alarm that recalculates to civil dawn each night. This ensures you wake up naturally with the light without needing to manually reset the alarm daily.

Can Opsin help with jet lag?

Yes, Opsin provides specific jet-lag plans with exact clock times to help you shift your body clock before flying. This aims to ensure you land already adjusted to your new time zone.

What devices is Opsin available on?

Opsin is available on iPhone and iPad devices. It integrates with Apple Health to read sleep and HRV data.

Is Opsin a medical device?

No, Opsin is a general wellness and educational tool. It is not a medical device and does not diagnose, treat, or prevent any medical condition. Consult a qualified professional for any health concerns.