# SunSync - Circadian Tracker — Boost energy and sleep better

> Boost energy and sleep better (iPhone/iPad app by Marta Rodriguez.)

- Source: https://appshunter.io/ios/app/sunsync-circadian-tracker/id6762293528 (this page in markdown: same URL + `.md`)
- Developer: [Marta Rodriguez](https://appshunter.io/developer/1873973295)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 22 MB
- Languages: Arabic, Bulgarian, Danish, English, Finnish, French, German, Greek, Hebrew, Hindi and 5 more
- Released: 2026-04-23
- Data updated: 2026-06-26
- User reviews in markdown: https://appshunter.io/ios/app/sunsync-circadian-tracker/id6762293528/reviews.md

## What is SunSync?

Always tired, waking groggy, or struggling to fall asleep? The cause might be simpler than you think — your morning light routine.
SunSync syncs your day to the sun. Track sunlight exposure, estimate your vitamin D intake, and get personalized circadian rhythm guidance — all based on your real location and habits.
Your body clock controls your sleep, energy, mood, and focus. SunSync helps you work with it — not against it.
With SunSync you can:

- Track sunlight exposure and daily light habits — know when you've hit your target
- Estimate vitamin D from sun exposure based on your skin type and location
- Log supplements and monitor your total daily intake
- Follow personalized circadian recommendations for your schedule
- Discover your best sunlight windows — and when to avoid the UV index
- Build routines to improve sleep and melatonin production naturally
- Set smart reminders for sunrise, sunset, and wind-down time
- Add a home screen widget — see your vitamin D window at a glance, without opening the app
- View history and long-term trends to see your progress

Built for the biohacking community — and anyone who just wants to feel better.
Whether you're optimizing for performance or simply tired of being tired, SunSync gives you the sunlight data your wellness routine has been missing. Vitamin D tracking, body clock alignment, supplement logging, and a home screen widget showing your vitamin D window — in one app.

Disclaimer: SunSync provides estimates and general wellness guidance. It is not a medical device and does not replace professional medical advice.

Terms: https://martarodriguezm.github.io/SunSyncLegal/terms.html
Privacy Policy: https://martarodriguezm.github.io/SunSyncLegal/privacy.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Year | $1.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $2.99 | one-time |



## Version history (last 4 releases)

### 2.2 — 2026-06-24

New app icon based on your feedback. Bug fixes and stability improvements.

### 2.1 — 2026-05-27

Bug fixes and stability improvements

### 2.0 — 2026-05-07

SunSync Widget
Your sunrise, sunset and vitamin D window are now available directly on your home screen — no need to open the app. Available in small and medium size.

SunSync Pro
Introducing the Pro subscription. Unlock the home screen widget and advanced circadian reminders: vitamin D window alert, dinner cutoff, blue-light blocker reminder, bedtime reminder and screen cutoff. Sunrise and sunset notifications remain free for everyone.

Smarter blue-light blocker reminder
The blue-light blocker notification is now based on your bedtime, not sunset. Default is 3 hours before sleep, fully adjustable.

More accurate vitamin D window
The optimal vitamin D window is now calculated using solar elevation angle (the shadow rule), giving you a more precise and personalised result wherever you are in the world.

Suggested daily vitamin D target
During onboarding, your daily vitamin D target is now automatically suggested based on your age, skin type and weight — and you can still adjust it manually.

### 1.0 — 2026-04-23

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-26.*